002719422 001__ 2719422 002719422 005__ 20220811050309.0 002719422 0248_ $$aoai:cds.cern.ch:2719422$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN 002719422 0247_ $$2DOI$$9bibmatch$$a10.1140/epjc/s10052-020-08675-4 002719422 035__ $$9arXiv$$aoai:arXiv.org:2006.02153 002719422 035__ $$9Inspire$$a1799249 002719422 037__ $$9arXiv$$aarXiv:2006.02153$$cnucl-ex 002719422 037__ $$aCERN-EP-2020-103 002719422 041__ $$aeng 002719422 088__ $$9CERN-EP-DRAFT-NA61-2020-003 002719422 100__ $$aAduszkiewicz, A.$$tGRID:grid.12847.38$$uWarsaw U.$$vUniversity of Warsaw, Warsaw, Poland 002719422 245__ $$aTwo-particle correlations in azimuthal angle and pseudorapidity in central $^7$Be+$^9$Be collisions at the CERN Super Proton Synchrotron 002719422 246__ $$9arXiv$$aTwo-particle correlations in azimuthal angle and pseudorapidity in central 7Be+9Be collisions at the CERN Super Proton Synchrotron 002719422 269__ $$aGeneva$$bCERN$$c01 Jun 2020 002719422 260__ $$c2020-12-14 002719422 300__ $$a20 p 002719422 506__ [email protected] 002719422 506__ $$mcds-edboard-na61 [CERN] 002719422 506__ $$mcds-ph-ep-publications-referee-non-lhc [CERN] 002719422 500__ $$9arXiv$$a28 pages, 17 figures, applied corrections after journal review 002719422 520__ $$aA measurement of charged hadron pair correlations in two-dimensional $\Delta\eta \Delta\phi$ space is presented. The analysis is based on total 30 million central Be+Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19$A$, 30$A$, 40$A$, 75$A$, and 150$A$ GeV/$c$. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The $C(\Delta\eta,\Delta\phi)$ correlation functions were compared with results from a similar analysis on p+p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be+Be collisions and p+p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the EPOS and UrQMD models are compared to the measurements. Evolution of an enhancement around $(\Delta\eta,\Delta\phi) = (0,0)$ with incident energy is observed in central Be+Be collisions. It is not predicted by both models and almost non-existing in proton-proton collisions at the same momentum per nucleon. 002719422 520__ $$9Springer$$aA measurement of charged hadron pair correlations in two-dimensional $\Delta \eta \Delta \phi $ space is presented. The analysis is based on total 30 million central Be + Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19A, 30A, 40A, 75A, and 150A $\text {Ge} \text {V}/c$. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The $C(\Delta \eta ,\Delta \phi )$ correlation functions were compared with results from a similar analysis on p + p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be + Be collisions and p + p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the Epos and UrQMD models are compared to the measurements. Evolution of an enhancement around $(\Delta \eta ,\Delta \phi ) = (0,0)$ with incident energy is observed in central Be + Be collisions. It is not predicted by both models and almost non-existing in proton–proton collisions at the same momentum per nucleon. 002719422 520__ $$9arXiv$$aA measurement of charged hadron pair correlations in two-dimensional $\Delta\eta\Delta\phi$ space is presented. The analysis is based on total 30 million central Be+Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19$A$, 30$A$, 40$A$, 75$A$, and 150$A$ GeV/$c$. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The $C(\Delta\eta,\Delta\phi)$ correlation functions were compared with results from a similar analysis on p+p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be+Be collisions and p+p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the EPOS and UrQMD models are compared to the measurements. Evolution of an enhancement around $(\Delta\eta,\Delta\phi) = (0,0)$ with incident energy is observed in central Be+Be collisions. It is not predicted by both models and almost non-existing in proton-proton collisions at the same momentum per nucleon. 002719422 540__ $$3preprint$$aCC-BY-4.0 002719422 540__ $$3preprint$$aarXiv nonexclusive-distrib 1.0$$uhttp://arxiv.org/licenses/nonexclusive-distrib/1.0/ 002719422 540__ $$3publication$$aCC-BY-4.0$$fSCOAP3$$uhttp://creativecommons.org/licenses/by/4.0/ 002719422 542__ $$3preprint$$dCERN$$g2020 002719422 542__ $$3publication$$dThe Author(s)$$g2020 002719422 562__ $$cComments submitted after 02-06-2020 17:45 002719422 595__ $$aCERN EDS 002719422 595__ $$aFor annual report 002719422 65017 $$2SzGeCERN$$aParticle Physics - Experiment 002719422 65017 $$2SzGeCERN$$aNuclear Physics - Experiment 002719422 6531_ $$9CERN$$arelativistic heavy ion physics 002719422 6531_ $$9CERN$$aquark gluon plasma 002719422 6531_ $$9CERN$$aparticle correlations and fluctuations 002719422 6531_ $$9CERN$$aexperimental results 002719422 6531_ $$9CERN$$ahadron correlations, Be+Be collisions, CERN SPS, NA61/SHINE 002719422 690C_ $$aCERN 002719422 690C_ $$aARTICLE 002719422 693__ $$aCERN SPS$$eSHINE NA61 002719422 700__ $$aAndronov, E.V.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aAntićić, T.$$tGRID:grid.4905.8$$uBoskovic Inst., Zagreb$$vRuđer Bošković Institute, Zagreb, Croatia 002719422 700__ $$aBabkin, V.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aBaszczyk, M.$$tGRID:grid.9922.0$$uAGH-UST, Cracow$$vAGH-University of Science and Technology, Kraków, Poland 002719422 700__ $$aBhosale, S.$$tGRID:grid.418860.3$$uCracow, INP$$vInstitute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland 002719422 700__ $$aBlondel, A.$$tGRID:grid.463935.e$$uParis U., VI-VII$$vLPNHE, University of Paris VI and VII, Paris, France 002719422 700__ $$aBogomilov, M.$$tGRID:grid.11355.33$$uSofiya U.$$vFaculty of Physics, University of Sofia, Sofia, Bulgaria 002719422 700__ $$aBrandin, A.$$tGRID:grid.183446.c$$uMoscow Phys. Eng. Inst.$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aBravar, A.$$tGRID:grid.8591.5$$uGeneva U.$$vUniversity of Geneva, Geneva, Switzerland 002719422 700__ $$aBryliński, W.$$tGRID:grid.1035.7$$uWarsaw U. of Tech.$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aBrzychczyk, J.$$tGRID:grid.5522.0$$uJagiellonian U. (main)$$vJagiellonian University, Kraków, Poland 002719422 700__ $$aBuryakov, M.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aBusygina, O.$$tGRID:grid.425051.7$$uMoscow, INR$$vInstitute for Nuclear Research, Moscow, Russia 002719422 700__ $$aBzdak, A.$$tGRID:grid.9922.0$$uAGH-UST, Cracow$$vAGH-University of Science and Technology, Kraków, Poland 002719422 700__ $$aCherif, H.$$tGRID:grid.7839.5$$uFrankfurt U.$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aĆirković, M.$$tGRID:grid.7149.b$$uBelgrade U.$$vUniversity of Belgrade, Belgrade, Serbia 002719422 700__ $$aCsanad, M.$$tGRID:grid.481809.c$$uWigner RCP, Budapest$$vWigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest, Hungary 002719422 700__ $$aCybowska, J.$$tGRID:grid.1035.7$$uWarsaw U. of Tech.$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aCzopowicz, T.$$tGRID:grid.411821.f$$tGRID:grid.1035.7$$uJan Kochanowski U.$$uWarsaw U. of Tech.$$vJan Kochanowski University in Kielce, Kielce, Poland$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aDamyanova, A.$$tGRID:grid.8591.5$$uGeneva U.$$vUniversity of Geneva, Geneva, Switzerland 002719422 700__ $$aDavis, N.$$tGRID:grid.418860.3$$uCracow, INP$$vInstitute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland 002719422 700__ $$aDeliyergiyev, M.$$tGRID:grid.411821.f$$uJan Kochanowski U.$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aDeveaux, M.$$tGRID:grid.7839.5$$uFrankfurt U.$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aDmitriev, A.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aDominik, W.$$tGRID:grid.12847.38$$uWarsaw U.$$vUniversity of Warsaw, Warsaw, Poland 002719422 700__ $$aDorosz, P.$$tGRID:grid.9922.0$$uAGH-UST, Cracow$$vAGH-University of Science and Technology, Kraków, Poland 002719422 700__ $$aDumarchez, J.$$tGRID:grid.463935.e$$uParis U., VI-VII$$vLPNHE, University of Paris VI and VII, Paris, France 002719422 700__ $$aEngel, R.$$tGRID:grid.7892.4$$uKIT, Karlsruhe$$vKarlsruhe Institute of Technology, Karlsruhe, Germany 002719422 700__ $$aFeofilov, G.A.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aFields, L.$$tGRID:grid.417851.e$$uFermilab$$vFermilab, Batavia, USA 002719422 700__ $$aFodor, Z.$$tGRID:grid.481809.c$$tGRID:grid.8505.8$$uWigner RCP, Budapest$$uWroclaw U.$$vWigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest, Hungary$$vUniversity of Wrocław, Wrocław, Poland 002719422 700__ $$aGaribov, A.$$uNNRC, Baku$$vNational Nuclear Research Center, Baku, Azerbaijan 002719422 700__ $$aGaździcki, M.$$tGRID:grid.7839.5$$tGRID:grid.411821.f$$uFrankfurt U.$$uJan Kochanowski U.$$vUniversity of Frankfurt, Frankfurt, Germany$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aGolosov, O.$$tGRID:grid.183446.c$$uMoscow Phys. Eng. Inst.$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aGolovatyuk, V.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aGolubeva, M.$$tGRID:grid.425051.7$$uMoscow, INR$$vInstitute for Nuclear Research, Moscow, Russia 002719422 700__ $$aGrebieszkow, K.$$tGRID:grid.1035.7$$uWarsaw U. of Tech.$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aGuber, F.$$tGRID:grid.425051.7$$uMoscow, INR$$vInstitute for Nuclear Research, Moscow, Russia 002719422 700__ $$aHaesler, A.$$tGRID:grid.8591.5$$uGeneva U.$$vUniversity of Geneva, Geneva, Switzerland 002719422 700__ $$aIgolkin, S.N.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aIlieva, S.$$tGRID:grid.11355.33$$uSofiya U.$$vFaculty of Physics, University of Sofia, Sofia, Bulgaria 002719422 700__ $$aIvashkin, A.$$tGRID:grid.425051.7$$uMoscow, INR$$vInstitute for Nuclear Research, Moscow, Russia 002719422 700__ $$aJohnson, S.R.$$tGRID:grid.266190.a$$uColorado U.$$vUniversity of Colorado, Boulder, USA 002719422 700__ $$aKadija, K.$$tGRID:grid.4905.8$$uBoskovic Inst., Zagreb$$vRuđer Bošković Institute, Zagreb, Croatia 002719422 700__ $$aKargin, N.$$tGRID:grid.183446.c$$uMoscow Phys. Eng. Inst.$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aKashirin, E.$$tGRID:grid.183446.c$$uMoscow Phys. Eng. Inst.$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aKiełbowicz, M.$$tGRID:grid.418860.3$$uCracow, INP$$vInstitute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland 002719422 700__ $$aKireyeu, V.A.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aKlochkov, V.$$tGRID:grid.7839.5$$uFrankfurt U.$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aKolesnikov, V.I.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aKolev, D.$$tGRID:grid.11355.33$$uSofiya U.$$vFaculty of Physics, University of Sofia, Sofia, Bulgaria 002719422 700__ $$aKorzenev, A.$$tGRID:grid.8591.5$$uGeneva U.$$vUniversity of Geneva, Geneva, Switzerland 002719422 700__ $$aKovalenko, V.N.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aKowalski, S.$$tGRID:grid.11866.38$$uSilesia U.$$vUniversity of Silesia, Katowice, Poland 002719422 700__ $$aKoziel, M.$$tGRID:grid.7839.5$$uFrankfurt U.$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aKrasnoperov, A.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aKucewicz, W.$$tGRID:grid.9922.0$$uAGH-UST, Cracow$$vAGH-University of Science and Technology, Kraków, Poland 002719422 700__ $$aKuich, M.$$tGRID:grid.12847.38$$uWarsaw U.$$vUniversity of Warsaw, Warsaw, Poland 002719422 700__ $$aKurepin, A.$$tGRID:grid.425051.7$$uMoscow, INR$$vInstitute for Nuclear Research, Moscow, Russia 002719422 700__ $$aLarsen, D.$$tGRID:grid.5522.0$$uJagiellonian U. (main)$$vJagiellonian University, Kraków, Poland 002719422 700__ $$aLászló, A.$$tGRID:grid.481809.c$$uWigner RCP, Budapest$$vWigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest, Hungary 002719422 700__ $$aLazareva, T.V.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aLewicki, M.$$tGRID:grid.8505.8$$uWroclaw U.$$vUniversity of Wrocław, Wrocław, Poland 002719422 700__ $$aŁojek, K.$$tGRID:grid.5522.0$$uJagiellonian U. (main)$$vJagiellonian University, Kraków, Poland 002719422 700__ $$aLyubushkin, V.V.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aMaćkowiak-Pawłowska, M.$$tGRID:grid.1035.7$$uWarsaw U. of Tech.$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aMajka, Z.$$tGRID:grid.5522.0$$uJagiellonian U. (main)$$vJagiellonian University, Kraków, Poland 002719422 700__ $$aMaksiak, B.$$jORCID:0000-0002-7950-2307$$tGRID:grid.450295.f$$uNCBJ, Warsaw$$vNational Centre for Nuclear Research, Warsaw, Poland 002719422 700__ $$aMalakhov, A.I.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aMarcinek, A.$$tGRID:grid.418860.3$$uCracow, INP$$vInstitute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland 002719422 700__ $$aMarino, A.D.$$tGRID:grid.266190.a$$uColorado U.$$vUniversity of Colorado, Boulder, USA 002719422 700__ $$aMarton, K.$$tGRID:grid.481809.c$$uWigner RCP, Budapest$$vWigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest, Hungary 002719422 700__ $$aMathes, H.J.$$tGRID:grid.7892.4$$uKIT, Karlsruhe$$vKarlsruhe Institute of Technology, Karlsruhe, Germany 002719422 700__ $$aMatulewicz, T.$$tGRID:grid.12847.38$$uWarsaw U.$$vUniversity of Warsaw, Warsaw, Poland 002719422 700__ $$aMatveev, V.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aMelkumov, G.L.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aMerzlaya, A.O.$$tGRID:grid.5522.0$$uJagiellonian U. (main)$$vJagiellonian University, Kraków, Poland 002719422 700__ $$aMesserly, B.$$tGRID:grid.21925.3d$$uPittsburgh U.$$vUniversity of Pittsburgh, Pittsburgh, USA 002719422 700__ $$aMik, Ł.$$tGRID:grid.9922.0$$uAGH-UST, Cracow$$vAGH-University of Science and Technology, Kraków, Poland 002719422 700__ $$aMorozov, S.$$tGRID:grid.425051.7$$tGRID:grid.183446.c$$uMoscow, INR$$uMoscow Phys. Eng. Inst.$$vInstitute for Nuclear Research, Moscow, Russia$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aMrówczyński, S.$$tGRID:grid.411821.f$$uJan Kochanowski U.$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aNagai, Y.$$tGRID:grid.266190.a$$uColorado U.$$vUniversity of Colorado, Boulder, USA 002719422 700__ $$aNaskręt, M.$$tGRID:grid.8505.8$$uWroclaw U.$$vUniversity of Wrocław, Wrocław, Poland 002719422 700__ $$aOzvenchuk, V.$$tGRID:grid.418860.3$$uCracow, INP$$vInstitute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland 002719422 700__ $$aPaolone, V.$$tGRID:grid.21925.3d$$uPittsburgh U.$$vUniversity of Pittsburgh, Pittsburgh, USA 002719422 700__ $$aPetukhov, O.$$tGRID:grid.425051.7$$uMoscow, INR$$vInstitute for Nuclear Research, Moscow, Russia 002719422 700__ $$aPłaneta, R.$$tGRID:grid.5522.0$$uJagiellonian U. (main)$$vJagiellonian University, Kraków, Poland 002719422 700__ $$aPodlaski, P.$$tGRID:grid.12847.38$$uWarsaw U.$$vUniversity of Warsaw, Warsaw, Poland 002719422 700__ $$aPopov, B.A.$$tGRID:grid.463935.e$$tGRID:grid.33762.33$$uParis U., VI-VII$$uDubna, JINR$$vLPNHE, University of Paris VI and VII, Paris, France$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aPorfy, B.$$tGRID:grid.481809.c$$uWigner RCP, Budapest$$vWigner Research Centre for Physics of the Hungarian Academy of Sciences, Budapest, Hungary 002719422 700__ $$aPosiadała-Zezula, M.$$tGRID:grid.12847.38$$uWarsaw U.$$vUniversity of Warsaw, Warsaw, Poland 002719422 700__ $$aProkhorova, D.S.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aPszczel, D.$$tGRID:grid.450295.f$$uNCBJ, Warsaw$$vNational Centre for Nuclear Research, Warsaw, Poland 002719422 700__ $$aPuławski, S.$$tGRID:grid.11866.38$$uSilesia U.$$vUniversity of Silesia, Katowice, Poland 002719422 700__ $$aPuzović, J.$$tGRID:grid.7149.b$$uBelgrade U.$$vUniversity of Belgrade, Belgrade, Serbia 002719422 700__ $$aRavonel, M.$$tGRID:grid.8591.5$$uGeneva U.$$vUniversity of Geneva, Geneva, Switzerland 002719422 700__ $$aRenfordt, R.$$tGRID:grid.7839.5$$uFrankfurt U.$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aRöhrich, D.$$tGRID:grid.7914.b$$uBergen U.$$vUniversity of Bergen, Bergen, Norway 002719422 700__ $$aRondio, E.$$tGRID:grid.450295.f$$uNCBJ, Warsaw$$vNational Centre for Nuclear Research, Warsaw, Poland 002719422 700__ $$aRoth, M.$$tGRID:grid.7892.4$$uKIT, Karlsruhe$$vKarlsruhe Institute of Technology, Karlsruhe, Germany 002719422 700__ $$aRumberger, B.T.$$tGRID:grid.266190.a$$uColorado U.$$vUniversity of Colorado, Boulder, USA 002719422 700__ $$aRumyantsev, M.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aRustamov, A.$$tGRID:grid.7839.5$$uNNRC, Baku$$uFrankfurt U.$$vNational Nuclear Research Center, Baku, Azerbaijan$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aRybczynski, M.$$tGRID:grid.411821.f$$uJan Kochanowski U.$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aRybicki, A.$$tGRID:grid.418860.3$$uCracow, INP$$vInstitute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland 002719422 700__ $$aSadovsky, A.$$tGRID:grid.425051.7$$uMoscow, INR$$vInstitute for Nuclear Research, Moscow, Russia 002719422 700__ $$aSchmidt, K.$$tGRID:grid.11866.38$$uSilesia U.$$vUniversity of Silesia, Katowice, Poland 002719422 700__ $$aSelyuzhenkov, I.$$tGRID:grid.183446.c$$uMoscow Phys. Eng. Inst.$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aSeryakov, A.Yu.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aSeyboth, P.$$tGRID:grid.411821.f$$uJan Kochanowski U.$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aSłodkowski, M.$$tGRID:grid.1035.7$$uWarsaw U. of Tech.$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aStaszel, P.$$tGRID:grid.5522.0$$uJagiellonian U. (main)$$vJagiellonian University, Kraków, Poland 002719422 700__ $$aStefanek, G.$$tGRID:grid.411821.f$$uJan Kochanowski U.$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aStepaniak, J.$$tGRID:grid.450295.f$$uNCBJ, Warsaw$$vNational Centre for Nuclear Research, Warsaw, Poland 002719422 700__ $$aStrikhanov, M.$$tGRID:grid.183446.c$$uMoscow Phys. Eng. Inst.$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aStröbele, H.$$tGRID:grid.7839.5$$uFrankfurt U.$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aŠuša, T.$$tGRID:grid.4905.8$$uBoskovic Inst., Zagreb$$vRuđer Bošković Institute, Zagreb, Croatia 002719422 700__ $$aTaranenko, A.$$tGRID:grid.183446.c$$uMoscow Phys. Eng. Inst.$$vNational Research Nuclear University (Moscow Engineering Physics Institute), Moscow, Russia 002719422 700__ $$aTefelska, A.$$tGRID:grid.1035.7$$uWarsaw U. of Tech.$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aTefelski, D.$$tGRID:grid.1035.7$$uWarsaw U. of Tech.$$vWarsaw University of Technology, Warsaw, Poland 002719422 700__ $$aTereshchenko, V.$$tGRID:grid.33762.33$$uDubna, JINR$$vJoint Institute for Nuclear Research, Dubna, Russia 002719422 700__ $$aToia, A.$$tGRID:grid.7839.5$$uFrankfurt U.$$vUniversity of Frankfurt, Frankfurt, Germany 002719422 700__ $$aTsenov, R.$$tGRID:grid.11355.33$$uSofiya U.$$vFaculty of Physics, University of Sofia, Sofia, Bulgaria 002719422 700__ $$aTurko, L.$$tGRID:grid.8505.8$$uWroclaw U.$$vUniversity of Wrocław, Wrocław, Poland 002719422 700__ $$aUlrich, R.$$tGRID:grid.7892.4$$uKIT, Karlsruhe$$vKarlsruhe Institute of Technology, Karlsruhe, Germany 002719422 700__ $$aUnger, M.$$tGRID:grid.7892.4$$uKIT, Karlsruhe$$vKarlsruhe Institute of Technology, Karlsruhe, Germany 002719422 700__ $$aUzhva, D.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aValiev, F.F.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aVeberič, D.$$tGRID:grid.7892.4$$uKIT, Karlsruhe$$vKarlsruhe Institute of Technology, Karlsruhe, Germany 002719422 700__ $$aVechernin, V.V.$$tGRID:grid.15447.33$$uSt. Petersburg State U.$$vSt. Petersburg State University, St. Petersburg, Russia 002719422 700__ $$aWickremasinghe, A.$$tGRID:grid.417851.e$$tGRID:grid.21925.3d$$uFermilab$$uPittsburgh U.$$vFermilab, Batavia, USA$$vUniversity of Pittsburgh, Pittsburgh, USA 002719422 700__ $$aWłodarczyk, Z.$$tGRID:grid.411821.f$$uJan Kochanowski U.$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aWojcik, K.$$tGRID:grid.11866.38$$uSilesia U.$$vUniversity of Silesia, Katowice, Poland 002719422 700__ $$aWyszyński, O.$$tGRID:grid.411821.f$$uJan Kochanowski U.$$vJan Kochanowski University in Kielce, Kielce, Poland 002719422 700__ $$aZimmerman, E.D.$$tGRID:grid.266190.a$$uColorado U.$$vUniversity of Colorado, Boulder, USA 002719422 700__ $$aZwaska, R.$$tGRID:grid.417851.e$$uFermilab$$vFermilab, Batavia, USA 002719422 710__ $$5PH 002719422 710__ $$gNA61/SHINE Collaboration 002719422 773__ $$c1151$$n12$$pEur. Phys. J. C$$v80$$y2020 002719422 859__ [email protected] 002719422 8564_ $$uhttps://lss.fnal.gov/archive/2020/pub/fermilab-pub-20-701.pdf$$yFermilab Accepted Manuscript 002719422 8564_ $$82199379$$s3144160$$uhttps://cds.cern.ch/record/2719422/files/CERN-EP-2020-103.pdf 002719422 8564_ $$82199235$$s3129843$$uhttps://cds.cern.ch/record/2719422/files/CERN-EP-DRAFT-NA61-2020-003 - draft.pdf$$yDraft (restricted) 002719422 8564_ $$82383070$$s7527688$$uhttps://cds.cern.ch/record/2719422/files/Aduszkiewicz2020_Article_Two-particleCorrelationsInAzim (1).pdf$$yFulltext from publisher 002719422 8564_ $$82383102$$s36579$$uhttps://cds.cern.ch/record/2719422/files/corrected_unlike.png$$y00011 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for unlike-sign pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383103$$s43924$$uhttps://cds.cern.ch/record/2719422/files/w25_corrected_neg.png$$y00025 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for negative charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383104$$s44474$$uhttps://cds.cern.ch/record/2719422/files/30_pos.png$$y00034 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383105$$s44623$$uhttps://cds.cern.ch/record/2719422/files/75_neg.png$$y00043 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383106$$s173638$$uhttps://cds.cern.ch/record/2719422/files/zdet.png$$y00002 (Color online) Charge of the beam particles measured by the Z detector. 002719422 8564_ $$82383107$$s45408$$uhttps://cds.cern.ch/record/2719422/files/30_neg.png$$y00035 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383108$$s37156$$uhttps://cds.cern.ch/record/2719422/files/corrected_neg.png$$y00021 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for negative charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383109$$s45045$$uhttps://cds.cern.ch/record/2719422/files/30_unlike.png$$y00033 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383110$$s43367$$uhttps://cds.cern.ch/record/2719422/files/w13_corrected_unlike.png$$y00013 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for unlike-sign pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383111$$s42589$$uhttps://cds.cern.ch/record/2719422/files/150_unlike.png$$y00045 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383112$$s42198$$uhttps://cds.cern.ch/record/2719422/files/pp_158_all.png$$y00027 (Color online) Comparison of correlation functions $C(\Delta\phi)$ for the 5\% most central Be+Be collisions and inelastic p+p interactions. Left column shows the correlation function for all charge pairs in Be+Be collisions at beam momentum 150\AGeVc per nucleon. Middle column: the same Be+Be correlation function, but shown in the vertical scale used for p+p interactions. Right column: p+p correlation function for all pairs at beam momentum 158~\GeVc taken from Ref.~\cite{Aduszkiewicz:2016mww}. 002719422 8564_ $$82383113$$s7527688$$uhttps://cds.cern.ch/record/2719422/files/scoap.pdf$$yArticle from SCOAP3 002719422 8564_ $$82383114$$s43199$$uhttps://cds.cern.ch/record/2719422/files/w8_corrected_all.png$$y00008 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for all charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383115$$s43189$$uhttps://cds.cern.ch/record/2719422/files/75_unlike.png$$y00041 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383116$$s24357$$uhttps://cds.cern.ch/record/2719422/files/First_bin_Dphi_40.png$$y00049 (Color online) Comparison of two-particle correlation function $C-1$ for the range $\Delta\eta \in [0, 0.5)$ and for zoomed in range of $0 \leq \Delta\phi \leq 1$ radians. Results of collisions of p+p are marked in blue and of Be+Be are marked in red. Columns from left to right show results for: all charge pairs, unlike-sign pairs, positive pairs, and negative pairs. Results for beam momenta 40$A$, 75$A$, and 150\AGeVc are plotted in successive rows. Data results are shown by markers (circles for p+p and squares for Be+Be), model results by lines (solid lines show \Epos while dotted lines -- UrQMD results). The results for p+p interactions were additionally scaled down by a factor of 5. Only statistical uncertainties are shown. 002719422 8564_ $$82383117$$s43953$$uhttps://cds.cern.ch/record/2719422/files/40_all.png$$y00036 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383118$$s28043$$uhttps://cds.cern.ch/record/2719422/files/Firstbins_neg.png$$y00056 (Color online) The sum of two-particle correlation function $C(\Delta\eta,\Delta\phi)$ in the $\Delta\phi$ region $[0,\pi/2)$ and $\Delta\eta \in [0,0.5)$ for different charge combinations. Top left picture for all charge pairs, top right for unlike-sign, bottom left for positive charged pairs, bottom right for negative charged. Results for Be+Be (red squares) were compared with p+p (blue circles) and with model predictions of the corresponding charge combination. The results of p+p are scaled down by factor of 5. 002719422 8564_ $$82383119$$s58032$$uhttps://cds.cern.ch/record/2719422/files/Multipad_dphi.png$$y00058 (Color online) Two-particle correlation function $C(\Delta\phi)$ obtained from projection of $C(\Delta\eta,\Delta\phi)$ onto the $\Delta\phi$ axis for subranges of $\Delta\eta$. From left to right the columns show respectively: all charge pairs, unlike-sign pairs, positive charge pairs, and negative charge pairs. Vertical bars denote statistical and shaded regions denote systematic uncertainties. Predictions of the \Epos model are shown by solid curves and the UrQMD model by dotted curves. Legend applies to all panels. 002719422 8564_ $$82383120$$s13183$$uhttps://cds.cern.ch/record/2719422/files/Firstbins_all.png$$y00053 (Color online) The sum of two-particle correlation function $C(\Delta\eta,\Delta\phi)$ in the $\Delta\phi$ region $[0,\pi/2)$ and $\Delta\eta \in [0,0.5)$ for different charge combinations. Top left picture for all charge pairs, top right for unlike-sign, bottom left for positive charged pairs, bottom right for negative charged. Results for Be+Be (red squares) were compared with p+p (blue circles) and with model predictions of the corresponding charge combination. The results of p+p are scaled down by factor of 5. 002719422 8564_ $$82383121$$s43454$$uhttps://cds.cern.ch/record/2719422/files/40_neg.png$$y00039 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383122$$s43431$$uhttps://cds.cern.ch/record/2719422/files/w7_corrected_all.png$$y00007 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for all charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383123$$s3405$$uhttps://cds.cern.ch/record/2719422/files/16s8l.png$$y00005 (Color online) Left: construction schematic of a PSD module. Right: front face of the PSD showing modules in green used for centrality determination. The modules marked with gray colour were not installed yet during taking at 40$A$, 75$A$ and 150\AGeVc. 002719422 8564_ $$82383124$$s44790$$uhttps://cds.cern.ch/record/2719422/files/150_pos.png$$y00046 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383125$$s41979$$uhttps://cds.cern.ch/record/2719422/files/w14_corrected_unlike.png$$y00014 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for unlike-sign pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383126$$s44667$$uhttps://cds.cern.ch/record/2719422/files/w22_corrected_neg.png$$y00022 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for negative charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383127$$s22113$$uhttps://cds.cern.ch/record/2719422/files/First_bin_Dphi_150.png$$y00051 (Color online) Comparison of two-particle correlation function $C-1$ for the range $\Delta\eta \in [0, 0.5)$ and for zoomed in range of $0 \leq \Delta\phi \leq 1$ radians. Results of collisions of p+p are marked in blue and of Be+Be are marked in red. Columns from left to right show results for: all charge pairs, unlike-sign pairs, positive pairs, and negative pairs. Results for beam momenta 40$A$, 75$A$, and 150\AGeVc are plotted in successive rows. Data results are shown by markers (circles for p+p and squares for Be+Be), model results by lines (solid lines show \Epos while dotted lines -- UrQMD results). The results for p+p interactions were additionally scaled down by a factor of 5. Only statistical uncertainties are shown. 002719422 8564_ $$82383128$$s49360$$uhttps://cds.cern.ch/record/2719422/files/Multipad_deta.png$$y00057 (Color online) Two-particle correlation function $C(\Delta\eta)$ obtained from projection of $C(\Delta\eta,\Delta\phi)$ onto the $\Delta\eta$ axis for subranges of $\Delta\phi$. From left to right the columns show respectively: all charge pairs, unlike-sign pairs, positive charge pairs, and negative charge pairs. Vertical bars denote statistical and shaded regions denote systematic uncertainties. Predictions of the \Epos model are shown by solid curves and the UrQMD model by dotted curves. Legend applies to all panels. 002719422 8564_ $$82383129$$s38030$$uhttps://cds.cern.ch/record/2719422/files/19_pos.png$$y00030 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383130$$s43896$$uhttps://cds.cern.ch/record/2719422/files/w17_corrected_pos.png$$y00017 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for positive charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383131$$s27599$$uhttps://cds.cern.ch/record/2719422/files/Firstbins_unlike.png$$y00054 (Color online) The sum of two-particle correlation function $C(\Delta\eta,\Delta\phi)$ in the $\Delta\phi$ region $[0,\pi/2)$ and $\Delta\eta \in [0,0.5)$ for different charge combinations. Top left picture for all charge pairs, top right for unlike-sign, bottom left for positive charged pairs, bottom right for negative charged. Results for Be+Be (red squares) were compared with p+p (blue circles) and with model predictions of the corresponding charge combination. The results of p+p are scaled down by factor of 5. 002719422 8564_ $$82383132$$s44571$$uhttps://cds.cern.ch/record/2719422/files/75_pos.png$$y00042 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383133$$s44800$$uhttps://cds.cern.ch/record/2719422/files/150_neg.png$$y00047 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383134$$s96492$$uhttps://cds.cern.ch/record/2719422/files/PSD_sandwich.png$$y00004 (Color online) Left: construction schematic of a PSD module. Right: front face of the PSD showing modules in green used for centrality determination. The modules marked with gray colour were not installed yet during taking at 40$A$, 75$A$ and 150\AGeVc. 002719422 8564_ $$82383135$$s41548$$uhttps://cds.cern.ch/record/2719422/files/w15_corrected_unlike.png$$y00015 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for unlike-sign pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383136$$s3275866$$uhttps://cds.cern.ch/record/2719422/files/fermilab-pub-20-701.pdf$$yFulltext 002719422 8564_ $$82383137$$s44493$$uhttps://cds.cern.ch/record/2719422/files/30_all.png$$y00032 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383138$$s3319048$$uhttps://cds.cern.ch/record/2719422/files/2006.02153.pdf$$yFulltext 002719422 8564_ $$82383139$$s11455$$uhttps://cds.cern.ch/record/2719422/files/First_bins_BeBe_all_unlike.png$$y00052 (Color online) The sum of two-particle correlation function $C(\Delta\eta,\Delta\phi)$ in the $\Delta\phi$ region $[0,\pi/2)$ and $\Delta\eta \in [0,0.5)$ for unlike-charge pairs (black squares) and all charge pairs (red circles) for the 5\% most central Be+Be collisions. 002719422 8564_ $$82383140$$s22765$$uhttps://cds.cern.ch/record/2719422/files/First_bin_Dphi_75.png$$y00050 (Color online) Comparison of two-particle correlation function $C-1$ for the range $\Delta\eta \in [0, 0.5)$ and for zoomed in range of $0 \leq \Delta\phi \leq 1$ radians. Results of collisions of p+p are marked in blue and of Be+Be are marked in red. Columns from left to right show results for: all charge pairs, unlike-sign pairs, positive pairs, and negative pairs. Results for beam momenta 40$A$, 75$A$, and 150\AGeVc are plotted in successive rows. Data results are shown by markers (circles for p+p and squares for Be+Be), model results by lines (solid lines show \Epos while dotted lines -- UrQMD results). The results for p+p interactions were additionally scaled down by a factor of 5. Only statistical uncertainties are shown. 002719422 8564_ $$82383141$$s43242$$uhttps://cds.cern.ch/record/2719422/files/75_all.png$$y00040 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383142$$s37186$$uhttps://cds.cern.ch/record/2719422/files/19_all.png$$y00028 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383143$$s42153$$uhttps://cds.cern.ch/record/2719422/files/BeBe_pp_scale_150_all.png$$y00026 (Color online) Comparison of correlation functions $C(\Delta\phi)$ for the 5\% most central Be+Be collisions and inelastic p+p interactions. Left column shows the correlation function for all charge pairs in Be+Be collisions at beam momentum 150\AGeVc per nucleon. Middle column: the same Be+Be correlation function, but shown in the vertical scale used for p+p interactions. Right column: p+p correlation function for all pairs at beam momentum 158~\GeVc taken from Ref.~\cite{Aduszkiewicz:2016mww}. 002719422 8564_ $$82383144$$s44135$$uhttps://cds.cern.ch/record/2719422/files/w24_corrected_neg.png$$y00024 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for negative charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383145$$s45433$$uhttps://cds.cern.ch/record/2719422/files/40_pos.png$$y00038 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383146$$s41295$$uhttps://cds.cern.ch/record/2719422/files/w10_corrected_all.png$$y00010 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for all charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc.(Color online) Comparison of correlation functions $C(\Delta\phi)$ for the 5\% most central Be+Be collisions and inelastic p+p interactions. Left column shows the correlation function for all charge pairs in Be+Be collisions at beam momentum 150\AGeVc per nucleon. Middle column: the same Be+Be correlation function, but shown in the vertical scale used for p+p interactions. Right column: p+p correlation function for all pairs at beam momentum 158~\GeVc taken from Ref.~\cite{Aduszkiewicz:2016mww}. 002719422 8564_ $$82383147$$s42209$$uhttps://cds.cern.ch/record/2719422/files/150_all.png$$y00044 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383148$$s71452$$uhttps://cds.cern.ch/record/2719422/files/adet.png$$y00003 Time-of-flight of fragments of Z/A with momentum of 13.9~\GeVc. Left: carbon ions shows double Gaussian structure due to two isotopes of carbon in the beam. Right: beryllium ions show single Gaussian distribution, indicating isotopic purity of the beryllium in the beam. 002719422 8564_ $$82383149$$s36954$$uhttps://cds.cern.ch/record/2719422/files/19_unlike.png$$y00029 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383150$$s44138$$uhttps://cds.cern.ch/record/2719422/files/40_unlike.png$$y00037 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383151$$s38159$$uhttps://cds.cern.ch/record/2719422/files/19_neg.png$$y00031 (Color online) Ratio $R^{\text{BeBe}}_{\text{pp}}$ for all pair combinations and momenta (following formula Eq.~\ref{eq:ratio_BeBe_pp}). Each row shows different beam momentum (beam momentum increases downwards). Every column presents results for different pair combinations (from left to right: all pairs, unlike-sign pairs, positive pairs, negative pairs). Note that correlation function for p+p was scaled down by a factor of 5 before calculation of ratio. 002719422 8564_ $$82383152$$s41931$$uhttps://cds.cern.ch/record/2719422/files/w9_corrected_all.png$$y00009 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for all charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383153$$s96646$$uhttps://cds.cern.ch/record/2719422/files/First_bin.png$$y00048 (Color online) Comparison of two-particle correlation function $C-1$ for the range $\Delta\eta \in [0, 0.5)$ in collisions of p+p (blue) and Be+Be (red). Columns from left to right show results for: all charge pairs, unlike-sign pairs, positive pairs, and negative pairs. Results for different beam momenta are plotted in successive rows. Data results are shown by markers (circles for p+p and squares for Be+Be), model results by lines (solid lines show \Epos while dotted lines -- UrQMD results). The results for p+p interactions were additionally scaled down by a factor of 5. Only statistical uncertainties are shown. 002719422 8564_ $$82383154$$s388852$$uhttps://cds.cern.ch/record/2719422/files/na61setup.png$$y00000 (Color online) The schematic layout of the \NASixtyOne experiment at the CERN SPS ~\cite{Abgrall:2014fa} showing the components used for the Be+Be energy scan (horizontal cut, not to scale). The beam instrumentation is sketched in the inset. Alignment of the chosen coordinate system as shown in the figure; its origin lies in the middle of VTPC-2, on the beam axis. The nominal beam direction is along the $z$ axis. The magnetic field bends charged particle trajectories in the $x$--$z$ (horizontal) plane. The drift direction in the TPCs is along the $y$ (vertical) axis. 002719422 8564_ $$82383155$$s42176$$uhttps://cds.cern.ch/record/2719422/files/w23_corrected_neg.png$$y00023 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for negative charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383156$$s44677$$uhttps://cds.cern.ch/record/2719422/files/w18_corrected_pos.png$$y00018 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for positive charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383157$$s43619$$uhttps://cds.cern.ch/record/2719422/files/w20_corrected_pos.png$$y00020 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for positive charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383158$$s38027$$uhttps://cds.cern.ch/record/2719422/files/corrected_pos.png$$y00016 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for positive charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383159$$s44352$$uhttps://cds.cern.ch/record/2719422/files/w12_corrected_unlike.png$$y00012 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for unlike-sign pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383160$$s37048$$uhttps://cds.cern.ch/record/2719422/files/corrected_all.png$$y00006 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for all charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383161$$s34278$$uhttps://cds.cern.ch/record/2719422/files/beamAndTriggerDet.png$$y00001 (Color online) The schematic of the placement of the beam and trigger detectors in high momentum \emph{(top)} and low momentum \emph{(bottom)} data taking. 002719422 8564_ $$82383162$$s13232$$uhttps://cds.cern.ch/record/2719422/files/Firstbins_pos.png$$y00055 (Color online) The sum of two-particle correlation function $C(\Delta\eta,\Delta\phi)$ in the $\Delta\phi$ region $[0,\pi/2)$ and $\Delta\eta \in [0,0.5)$ for different charge combinations. Top left picture for all charge pairs, top right for unlike-sign, bottom left for positive charged pairs, bottom right for negative charged. Results for Be+Be (red squares) were compared with p+p (blue circles) and with model predictions of the corresponding charge combination. The results of p+p are scaled down by factor of 5. 002719422 8564_ $$82383163$$s43765$$uhttps://cds.cern.ch/record/2719422/files/w19_corrected_pos.png$$y00019 (Color online) Two-particle correlation function $C(\Delta\eta,\Delta\phi)$ for positive charge pairs in the 5\% most central Be+Be collisions at 19$A$-150\AGeVc. 002719422 8564_ $$82383070$$s11280$$uhttps://cds.cern.ch/record/2719422/files/Aduszkiewicz2020_Article_Two-particleCorrelationsInAzim (1).gif?subformat=icon$$xicon$$yFulltext from publisher 002719422 8564_ $$82383070$$s168597$$uhttps://cds.cern.ch/record/2719422/files/Aduszkiewicz2020_Article_Two-particleCorrelationsInAzim (1).jpg?subformat=icon-700$$xicon-700$$yFulltext from publisher 002719422 8564_ $$82383070$$s38813$$uhttps://cds.cern.ch/record/2719422/files/Aduszkiewicz2020_Article_Two-particleCorrelationsInAzim (1).jpg?subformat=icon-180$$xicon-180$$yFulltext from publisher 002719422 9031_ $$aApproval requested for number CERN-EP-2020-103$$bCERN-EP-2020-103$$cEPPHAPP$$d2020-06-01 12:21:36$$e2020-06-08 12:21:[email protected]$$gskip stamping$$swaiting 002719422 9031_ $$aDocument approved$$bCERN-EP-2020-103$$cEPPHAPP$$d2020-06-02 16:42:[email protected]$$sapproved 002719422 916__ $$sn$$w202023 002719422 960__ $$a13 002719422 980__ $$aNA61_Papers 002719422 980__ $$aARTICLE 002719422 981__ $$a2722386