Measurement of the Charged-Pion Polarizability

Adolph, C.; Szabelski, A.; Michigami, T.; Kabuss, E.; Sznajder, P.; Kunne, F.; Reicherz, G.; Rossiyskaya, N.S.; Austregesilo, A.; Bernhard, J.; Berlin, A.; Ivanov, A.; Crespo, M.L.; Pretz, J.; Matsuda, T.; Hoppner, Ch.; Koivuniemi, J.H.; Schmieden, H.; Buchele, M.; Novy, J.; Hashimoto, R.; Uman, I.; Quaresma, M.; Gautheron, F.; Uhl, S.; Bicker, K.; Tessarotto, F.; Marchand, C.; Sulc, M.; Kolosov, V.N.; Konstantinov, V.F.; Horikawa, N.; Bodlak, M.; Zink, A.; Curiel, Q.; Schill, C.; Thibaud, F.; Gorzellik, M.; Hinterberger, F.; Burtin, E.; Jorg, P.; Parsamyan, B.; Khokhlov, Yu. A.; Schmidt, K.; Dinkelbach, A.M.; Silva, L.; Braun, C.; Finger, M., Jr.; Kisselev, Yu.; Kuchinski, N.; Nikolaenko, V.I.; Franco, C.; Srnka, A.; Mikhailov, Yu. V.; Platchkov, S.; Gobbo, B.; Shevchenko, O.Yu.; Dziewiecki, M.; Savin, I.A.; Chung, S.U.; Ramos, S.; Lehmann, A.; Klein, F.; Ivanshin, Yu.; Baum, G.; Regali, C.; Olshevsky, A.G.; Sinha, L.; Guskov, A.; Ryabchikov, D.I.; Virius, M.; Miyachi, Y.; Alexeev, G.D.; Bressan, A.; Andrieux, V.; Sosio, S.; Maggiora, A.; Kurek, K.; Sandacz, A.; Ostrick, M.; Hahne, D.; Nunes, A.S.; Makke, N.; Rychter, A.; Barth, J.; Bedfer, Y.; Peshekhonov, D.; Lednev, A.A.; Ferrero, A.; Denisov, O.Yu.; Mallot, G.K.; Eyrich, W.; Konorov, I.; Sarkar, S.; Elia, C.; Marzec, J.; Beck, R.; Rocco, E.; Schiavon, P.; Donskov, S.V.; Szameitat, T.; Bisplinghoff, J.; Magnon, A.; Guthorl, T.; Gavrichtchouk, O.P.; Samoylenko, V.D.; Grabmuller, S.; Kondo, K.; Grube, B.; Dasgupta, S.S.; Meshcheryakov, G.; Kotzinian, A.M.; Dalla Torre, S.; Gnesi, I.; Lichtenstadt, J.; Zavertyaev, M.; Neyret, D.; Khaustov, G.V.; Sbrizzai, G.; Goertz, S.; Neubert, S.; Martin, A.; Kurjata, R.P.; Ziembicki, M.; Levorato, S.; Jary, V.; Kuhn, R.; Grasso, A.; Windmolders, R.; Schott, M.; Colantoni, M.; Duic, V.; Nagaytsev, A.; Matousek, J.; Gerassimov, S.; Dunnweber, W.; Grussenmeyer, T.; Birsa, R.; Stolarski, M.; Quintans, C.; Efremov, A.; Eversheim, P.D.; Klimaszewski, K.; Nowak, W.D.; Akhunzyanov, R.; Schopferer, S.; Jahn, R.; Takekawa, S.; Faessler, M.; von Harrach, D.; Amoroso, A.; Capozza, L.; Wolbeek, J. ter; Finger, M.; Panzieri, D.; Herrmann, F.; Konigsmann, K.; Alexeev, M.G.; Sozzi, F.; Orlov, I.; Panknin, R.; Badelek, B.; Steiger, L.; Wang, L.; Jasinski, P.; Kramer, M.; Doshita, N.; Heinsius, F.H.; Schluter, T.; Fischer, H.; Ishimoto, S.; Sirtl, S.; Paul, S.; Matsuda, H.; Zaremba, K.; Dasgupta, S.; Schonning, K.; Sulej, R.; Kroumchtein, Z.V.; Haas, F.; Bieling, J.; Zemlyanichkina, E.; Bradamante, F.; Anosov, V.; Frolov, V.; Iwata, T.; Ketzer, B.; Levillain, M.; Wollny, H.; Boer, M.; Nerling, F.; Weisrock, T.; Filin, A.; Geyer, R.; Meyer, W.; Nagel, T.; Cicuttin, A.; Friedrich, J.M.; Suzuki, H.; Huber, S.; Pochodzalla, J.; Balestra, F.; von Hohenesche, N. du Fresne; d'Hose, N.; Polyakov, V.A.; Moinester, M.A.; Joosten, R.; Kouznetsov, O.; Slunecka, M.; Tessaro, S.; Wilfert, M.; Bordalo, P.; Chiosso, M.

doi:10.1103/PhysRevLett.114.062002

001702252 001__ 1702252
001702252 005__ 20220810150525.0
001702252 0248_ $$aoai:cds.cern.ch:1702252$$pcerncds:CERN$$pcerncds:CERN:FULLTEXT$$pcerncds:FULLTEXT
001702252 0247_ $$2DOI$$a10.1103/PhysRevLett.114.062002
001702252 035__ $$9arXiv$$aoai:arXiv.org:1405.6377
001702252 035__ $$9Inspire$$a1298026
001702252 037__ $$9arXiv$$aarXiv:1405.6377$$chep-ex
001702252 037__ $$aCERN-PH-EP-2014-109
001702252 041__ $$aeng
001702252 084__ $$2CERN Library$$aPH-EP-2014-109
001702252 088__ $$9CERN-PH-EP-DRAFT-COMPASS-2014-005
001702252 088__ $$aCERN-PH-EP-2014-109
001702252 100__ $$aAdolph, C.$$uErlangen - Nuremberg U.
001702252 245__ $$aMeasurement of the Charged-Pion Polarizability
001702252 246__ $$aMeasurement of the charged-pion polarisability
001702252 260__ $$c2015-02-10
001702252 269__ $$aGeneva$$bCERN$$c21 May 2014
001702252 300__ $$a6 p
001702252 500__ $$aComments: Published version: 9 pages, 3 figures, 1 table
001702252 500__ $$9arXiv$$aPublished version: 9 pages, 3 figures, 1 table
001702252 506__ [email protected]
001702252 506__ $$mcds-edboard-compass [CERN]
001702252 506__ $$mcds-ph-ep-publications-referee-non-lhc [CERN]
001702252 520__ $$aThe COMPASS collaboration at CERN has investigated pion Compton scattering, $\pi^-\gamma\rightarrow \pi^-\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction $\pi^-\mathrm{Ni}\rightarrow\pi^-\gamma\;\mathrm{Ni}$, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, $Q^2<0.0015$ (GeV/$c$)$^2$. From a sample of 63 000 events the pion electric polarisability is determined to be $\alpha_\pi = (2.0 \pm 0.6_{\mbox{stat}} \pm 0.7_{\mbox{syst}}) \times 10^{-4} \mbox{fm}^3$ under the assumption $\alpha_\pi=-\beta_\pi$, which relates the electric and magnetic dipole polarisabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction, that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambigiously known, was performed for an independent estimate of the systematic uncertainty.
001702252 520__ $$9APS$$a<p>The COMPASS collaboration at CERN has investigated pion Compton scattering, <inline-formula><mml:math display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>-</mml:mo></mml:msup><mml:mi>γ</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>-</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math></inline-formula>, at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction <inline-formula><mml:math display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>-</mml:mo></mml:mrow></mml:msup><mml:mi>Ni</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>-</mml:mo></mml:mrow></mml:msup><mml:mi>γ</mml:mi><mml:mi>Ni</mml:mi></mml:mrow></mml:math></inline-formula>, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, <inline-formula><mml:math display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Q</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup><mml:mo>&lt;</mml:mo><mml:mn>0.0015</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mo stretchy="false">(</mml:mo><mml:mi>GeV</mml:mi><mml:mo>/</mml:mo><mml:mi>c</mml:mi><mml:msup><mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math></inline-formula>. From a sample of 63 000 events, the pion electric polarizability is determined to be <inline-formula><mml:math display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>α</mml:mi></mml:mrow><mml:mrow><mml:mi>π</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:mn>2.0</mml:mn><mml:mo>±</mml:mo><mml:mn>0.</mml:mn><mml:msub><mml:mrow><mml:mn>6</mml:mn></mml:mrow><mml:mrow><mml:mi>stat</mml:mi></mml:mrow></mml:msub><mml:mo>±</mml:mo><mml:mn>0.</mml:mn><mml:msub><mml:mrow><mml:mn>7</mml:mn></mml:mrow><mml:mrow><mml:mi>syst</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mo>×</mml:mo><mml:mn>1</mml:mn><mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mo>-</mml:mo><mml:mn>4</mml:mn></mml:mrow></mml:msup><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi>fm</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math></inline-formula> under the assumption <inline-formula><mml:math display="inline"><mml:msub><mml:mi>α</mml:mi><mml:mi>π</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:msub><mml:mi>β</mml:mi><mml:mi>π</mml:mi></mml:msub></mml:math></inline-formula>, which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambiguously known, was performed for an independent estimate of the systematic uncertainty.</p>
001702252 520__ $$9arXiv$$aThe COMPASS collaboration at CERN has investigated pion Compton scattering, $\pi^-\gamma\rightarrow \pi^-\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction $\pi^-\mathrm{Ni}\rightarrow\pi^-\gamma\;\mathrm{Ni}$, which is initiated by 190\,GeV pions impinging on a nickel target. The exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, $Q^2<0.0015$\,(GeV/$c$)$^2$. From a sample of 63\,000 events the pion electric polarisability is determined to be $\alpha_\pi\ =\ (\,2.0\ \pm\ 0.6_{\mbox{\scriptsize stat}}\ \pm\ 0.7_{\mbox{\scriptsize syst}}\,) \times 10^{-4}\,\mbox{fm}^3$ under the assumption $\alpha_\pi=-\beta_\pi$, which relates the electric and magnetic dipole polarisabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction, that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambigiously known, was performed for an independent estimate of the systematic uncertainty.
001702252 540__ $$3preprint$$aCC-BY-4.0
001702252 540__ $$3publication$$aCC-BY-3.0
001702252 542__ $$3preprint$$dCERN$$g2014
001702252 542__ $$3publication$$dThe Author(s)$$g2015
001702252 562__ $$cPublic comments
001702252 595__ $$aLANL EDS
001702252 595__ $$aCERN EDS
001702252 595__ $$aCERN-PH-EP
001702252 65017 $$2SzGeCERN$$aParticle Physics - Experiment
001702252 65027 $$2arXiv$$aNuclear Physics - Experiment
001702252 6531_ $$9CERN$$aelectroweak interaction
001702252 6531_ $$9CERN$$aQCD
001702252 6531_ $$9CERN$$aexperimental results
001702252 690C_ $$aARTICLE
001702252 690C_ $$aCERN
001702252 693__ $$aCERN SPS$$eCOMPASS NA58
001702252 695__ $$9LANL EDS$$ahep-ex
001702252 695__ $$9LANL EDS$$anucl-ex
001702252 700__ $$aAkhunzyanov, R.$$uDubna, JINR
001702252 700__ $$aAlexeev, M.G.$$uTurin U.
001702252 700__ $$aAlexeev, G.D.$$uDubna, JINR
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001702252 700__ $$aBadelek, B.$$uWarsaw U.
001702252 700__ $$aBalestra, F.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aBarth, J.$$uBonn U.
001702252 700__ $$aBaum, G.$$uBielefeld U.
001702252 700__ $$aBeck, R.$$uBonn U., HISKP
001702252 700__ $$aBedfer, Y.$$uIRFU, SPhN, Saclay
001702252 700__ $$aBerlin, A.$$uRuhr U., Bochum
001702252 700__ $$aBernhard, J.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aBicker, K.$$uCERN$$uMunich, Tech. U.
001702252 700__ $$aBieling, J.$$uBonn U.
001702252 700__ $$aBirsa, R.$$uINFN, Trieste
001702252 700__ $$aBisplinghoff, J.$$uBonn U., HISKP
001702252 700__ $$aBodlak, M.$$uCharles U.
001702252 700__ $$aBoer, M.$$uIRFU, SPhN, Saclay
001702252 700__ $$aBordalo, P.$$uLIP, Lisbon$$uLisbon, IST
001702252 700__ $$aBradamante, F.$$uTrieste U.$$uINFN, Trieste
001702252 700__ $$aBraun, C.$$uErlangen - Nuremberg U.
001702252 700__ $$aBressan, A.$$uTrieste U.$$uINFN, Trieste
001702252 700__ $$aBuchele, M.$$uFreiburg U.
001702252 700__ $$aBurtin, E.$$uIRFU, SPhN, Saclay
001702252 700__ $$aCapozza, L.$$uIRFU, SPhN, Saclay
001702252 700__ $$aChiosso, M.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aChung, S.U.$$uMunich, Tech. U.$$uPusan Natl. U.$$uBrookhaven
001702252 700__ $$aCicuttin, A.$$uICTP, Trieste$$uINFN, Trieste
001702252 700__ $$aColantoni, M.$$uINFN, Turin
001702252 700__ $$aCrespo, M.L.$$uICTP, Trieste$$uINFN, Trieste
001702252 700__ $$aCuriel, Q.$$uIRFU, SPhN, Saclay
001702252 700__ $$aDalla Torre, S.$$uINFN, Trieste
001702252 700__ $$aDasgupta, S.S.$$uMatrivani Inst., Calcutta
001702252 700__ $$aDasgupta, S.$$uINFN, Trieste
001702252 700__ $$aDenisov, O.Yu.$$uINFN, Turin
001702252 700__ $$aDinkelbach, A.M.$$uMunich, Tech. U.
001702252 700__ $$aDonskov, S.V.$$uKurchatov Inst., Moscow
001702252 700__ $$aDoshita, N.$$uYamagata U.
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001702252 700__ $$aDunnweber, W.$$uMunich U.
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001702252 700__ $$aEfremov, A.$$uDubna, JINR
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001702252 700__ $$aFinger, M.$$iINSPIRE-00320280$$uCharles U.
001702252 700__ $$aFinger, M., Jr.$$jORCID:0000-0003-3155-2484$$uCharles U.
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001702252 700__ $$aFranco, C.$$uLIP, Lisbon
001702252 700__ $$avon Hohenesche, N. du Fresne$$uMainz U., Inst. Kernphys.$$uCERN
001702252 700__ $$aFriedrich, J.M.$$uMunich, Tech. U.
001702252 700__ $$aFrolov, V.$$uCERN
001702252 700__ $$aGautheron, F.$$uRuhr U., Bochum
001702252 700__ $$aGavrichtchouk, O.P.$$uDubna, JINR
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001702252 700__ $$aGeyer, R.$$uMunich U.
001702252 700__ $$aGnesi, I.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aGobbo, B.$$uINFN, Trieste
001702252 700__ $$aGoertz, S.$$uBonn U.
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001702252 700__ $$aGrabmuller, S.$$uMunich, Tech. U.
001702252 700__ $$aGrasso, A.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aGrube, B.$$uMunich, Tech. U.
001702252 700__ $$aGrussenmeyer, T.$$uFreiburg U.
001702252 700__ $$aGuskov, A.$$uDubna, JINR
001702252 700__ $$aGuthorl, T.$$uFreiburg U.
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001702252 700__ $$avon Harrach, D.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aHahne, D.$$uBonn U.
001702252 700__ $$aHashimoto, R.$$uYamagata U.
001702252 700__ $$aHeinsius, F.H.$$uFreiburg U.
001702252 700__ $$aHerrmann, F.$$uFreiburg U.
001702252 700__ $$aHinterberger, F.$$uBonn U., HISKP
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001702252 700__ $$aHorikawa, N.$$uNagoya U.$$uChubu U.
001702252 700__ $$ad'Hose, N.$$uIRFU, SPhN, Saclay
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001702252 700__ $$aIshimoto, S.$$uYamagata U.$$uKEK, Tsukuba
001702252 700__ $$aIvanov, A.$$uDubna, JINR
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001702252 700__ $$aIwata, T.$$uYamagata U.
001702252 700__ $$aJahn, R.$$uBonn U., HISKP
001702252 700__ $$aJary, V.$$uPrague, Tech. U.
001702252 700__ $$aJasinski, P.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aJorg, P.$$uFreiburg U.
001702252 700__ $$aJoosten, R.$$uBonn U., HISKP
001702252 700__ $$aKabuss, E.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aKetzer, B.$$uMunich, Tech. U.$$uBonn U.
001702252 700__ $$aKhaustov, G.V.$$uKurchatov Inst., Moscow
001702252 700__ $$aKhokhlov, Yu. A.$$uKurchatov Inst., Moscow$$uMoscow, MIPT
001702252 700__ $$aKisselev, Yu.$$uDubna, JINR
001702252 700__ $$aKlein, F.$$uBonn U.
001702252 700__ $$aKlimaszewski, K.$$uWarsaw, Inst. Nucl. Studies
001702252 700__ $$aKoivuniemi, J.H.$$uRuhr U., Bochum
001702252 700__ $$aKolosov, V.N.$$uKurchatov Inst., Moscow
001702252 700__ $$aKondo, K.$$uYamagata U.
001702252 700__ $$aKonigsmann, K.$$uFreiburg U.
001702252 700__ $$aKonorov, I.$$uLebedev Inst.$$uMunich, Tech. U.
001702252 700__ $$aKonstantinov, V.F.$$uKurchatov Inst., Moscow
001702252 700__ $$aKotzinian, A.M.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aKouznetsov, O.$$uDubna, JINR
001702252 700__ $$aKramer, M.$$uMunich, Tech. U.
001702252 700__ $$aKroumchtein, Z.V.$$uDubna, JINR
001702252 700__ $$aKuchinski, N.$$uDubna, JINR
001702252 700__ $$aKuhn, R.$$uMunich, Tech. U.
001702252 700__ $$aKunne, F.$$uIRFU, SPhN, Saclay
001702252 700__ $$aKurek, K.$$uWarsaw, Inst. Nucl. Studies
001702252 700__ $$aKurjata, R.P.$$uWarsaw U. of Tech.
001702252 700__ $$aLednev, A.A.$$uKurchatov Inst., Moscow
001702252 700__ $$aLehmann, A.$$uErlangen - Nuremberg U.
001702252 700__ $$aLevillain, M.$$uIRFU, SPhN, Saclay
001702252 700__ $$aLevorato, S.$$uINFN, Trieste
001702252 700__ $$aLichtenstadt, J.$$uTel Aviv U.
001702252 700__ $$aMaggiora, A.$$uINFN, Turin
001702252 700__ $$aMagnon, A.$$uIRFU, SPhN, Saclay
001702252 700__ $$aMakke, N.$$uTrieste U.$$uINFN, Trieste
001702252 700__ $$aMallot, G.K.$$uCERN
001702252 700__ $$aMarchand, C.$$uIRFU, SPhN, Saclay
001702252 700__ $$aMartin, A.$$uTrieste U.$$uINFN, Trieste
001702252 700__ $$aMarzec, J.$$uWarsaw U. of Tech.
001702252 700__ $$aMatousek, J.$$uCharles U.
001702252 700__ $$aMatsuda, H.$$uYamagata U.
001702252 700__ $$aMatsuda, T.$$uMiyazaki U.
001702252 700__ $$aMeshcheryakov, G.$$uDubna, JINR
001702252 700__ $$aMeyer, W.$$uRuhr U., Bochum
001702252 700__ $$aMichigami, T.$$uYamagata U.
001702252 700__ $$aMikhailov, Yu. V.$$uKurchatov Inst., Moscow
001702252 700__ $$aMiyachi, Y.$$uYamagata U.
001702252 700__ $$aMoinester, M.A.$$uTel Aviv U.
001702252 700__ $$aNagaytsev, A.$$uDubna, JINR
001702252 700__ $$aNagel, T.$$uMunich, Tech. U.
001702252 700__ $$aNerling, F.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aNeubert, S.$$uMunich, Tech. U.
001702252 700__ $$aNeyret, D.$$uIRFU, SPhN, Saclay
001702252 700__ $$aNikolaenko, V.I.$$uKurchatov Inst., Moscow
001702252 700__ $$aNovy, J.$$uPrague, Tech. U.
001702252 700__ $$aNowak, W.D.$$uFreiburg U.
001702252 700__ $$aNunes, A.S.$$uLIP, Lisbon
001702252 700__ $$aOlshevsky, A.G.$$uDubna, JINR
001702252 700__ $$aOrlov, I.$$uDubna, JINR
001702252 700__ $$aOstrick, M.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aPanknin, R.$$uBonn U.
001702252 700__ $$aPanzieri, D.$$uPiemonte Orientale U., Alessandria$$uINFN, Turin
001702252 700__ $$aParsamyan, B.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aPaul, S.$$uMunich, Tech. U.
001702252 700__ $$aPeshekhonov, D.$$uDubna, JINR
001702252 700__ $$aPlatchkov, S.$$uIRFU, SPhN, Saclay
001702252 700__ $$aPochodzalla, J.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aPolyakov, V.A.$$uKurchatov Inst., Moscow
001702252 700__ $$aPretz, J.$$uBonn U.$$uAachen, Tech. Hochsch.
001702252 700__ $$aQuaresma, M.$$uLIP, Lisbon
001702252 700__ $$aQuintans, C.$$uLIP, Lisbon
001702252 700__ $$aRamos, S.$$uLIP, Lisbon$$uLisbon, IST
001702252 700__ $$aRegali, C.$$uFreiburg U.
001702252 700__ $$aReicherz, G.$$uRuhr U., Bochum
001702252 700__ $$aRocco, E.$$uCERN
001702252 700__ $$aRossiyskaya, N.S.$$uDubna, JINR
001702252 700__ $$aRyabchikov, D.I.$$uKurchatov Inst., Moscow
001702252 700__ $$aRychter, A.$$uWarsaw U. of Tech.
001702252 700__ $$aSamoylenko, V.D.$$uKurchatov Inst., Moscow
001702252 700__ $$aSandacz, A.$$uWarsaw, Inst. Nucl. Studies
001702252 700__ $$aSarkar, S.$$uMatrivani Inst., Calcutta
001702252 700__ $$aSavin, I.A.$$uDubna, JINR
001702252 700__ $$aSbrizzai, G.$$uTrieste U.$$uINFN, Trieste
001702252 700__ $$aSchiavon, P.$$uTrieste U.$$uINFN, Trieste
001702252 700__ $$aSchill, C.$$uFreiburg U.
001702252 700__ $$aSchluter, T.$$uMunich U.
001702252 700__ $$aSchmidt, K.$$uFreiburg U.
001702252 700__ $$aSchmieden, H.$$uBonn U.
001702252 700__ $$aSchonning, K.$$uCERN
001702252 700__ $$aSchopferer, S.$$uFreiburg U.
001702252 700__ $$aSchott, M.$$uCERN
001702252 700__ $$aShevchenko, O.Yu.$$uDubna, JINR
001702252 700__ $$aSilva, L.$$uLIP, Lisbon
001702252 700__ $$aSinha, L.$$uMatrivani Inst., Calcutta
001702252 700__ $$aSirtl, S.$$uFreiburg U.
001702252 700__ $$aSlunecka, M.$$uDubna, JINR
001702252 700__ $$aSosio, S.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aSozzi, F.$$uINFN, Trieste
001702252 700__ $$aSrnka, A.$$uInst. Sci. Instruments, Brno
001702252 700__ $$aSteiger, L.$$uINFN, Trieste
001702252 700__ $$aStolarski, M.$$uLIP, Lisbon
001702252 700__ $$aSulc, M.$$uLiberec Tech. U.
001702252 700__ $$aSulej, R.$$uWarsaw, Inst. Nucl. Studies
001702252 700__ $$aSuzuki, H.$$uYamagata U.$$uChubu U.
001702252 700__ $$aSzabelski, A.$$uWarsaw, Inst. Nucl. Studies
001702252 700__ $$aSzameitat, T.$$uFreiburg U.
001702252 700__ $$aSznajder, P.$$uWarsaw, Inst. Nucl. Studies
001702252 700__ $$aTakekawa, S.$$uTurin U.$$uINFN, Turin
001702252 700__ $$aWolbeek, J. ter$$uFreiburg U.
001702252 700__ $$aTessaro, S.$$uINFN, Trieste
001702252 700__ $$aTessarotto, F.$$uINFN, Trieste
001702252 700__ $$aThibaud, F.$$uIRFU, SPhN, Saclay
001702252 700__ $$aUhl, S.$$uMunich, Tech. U.
001702252 700__ $$aUman, I.$$uMunich U.
001702252 700__ $$aVirius, M.$$uPrague, Tech. U.
001702252 700__ $$aWang, L.$$uRuhr U., Bochum
001702252 700__ $$aWeisrock, T.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aWilfert, M.$$uMainz U., Inst. Kernphys.
001702252 700__ $$aWindmolders, R.$$uBonn U.
001702252 700__ $$aWollny, H.$$uIRFU, SPhN, Saclay
001702252 700__ $$aZaremba, K.$$uWarsaw U. of Tech.
001702252 700__ $$aZavertyaev, M.$$uLebedev Inst.
001702252 700__ $$aZemlyanichkina, E.$$uDubna, JINR
001702252 700__ $$aZiembicki, M.$$uWarsaw U. of Tech.
001702252 700__ $$aZink, A.$$uErlangen - Nuremberg U.
001702252 710__ $$5PH
001702252 710__ $$gCOMPASS Collaboration
001702252 773__ $$c062002$$pPhys. Rev. Lett.$$v114$$y2015
001702252 859__ [email protected]
001702252 8564_ $$uhttp://www.interactions.org/cms/?pid=1034489$$yInteractions.org article
001702252 8564_ $$81411326$$s609571$$uhttps://cds.cern.ch/record/1702252/files/arXiv:1405.6377.pdf
001702252 8564_ $$8880173$$s607040$$uhttps://cds.cern.ch/record/1702252/files/CERN-PH-EP-2014-109.pdf
001702252 8564_ $$81235001$$s253632$$uhttps://cds.cern.ch/record/1702252/files/PhysRevLett.114.062002.pdf$$yAPS Open Access article
001702252 8564_ $$81411327$$s28509$$uhttps://cds.cern.ch/record/1702252/files/fig2.png$$y00004 The measured and simulated $x_\gamma$ distributions for pion (lower curve) and muon (upper curve) beam. The statistical uncertainty of the real data points is indicated by vertical error bars, while the width of the symbols is set arbitrarily to one third of the bin width. The lines connect the simulation results for the same bin centers. The bottom panel shows the $\pi^0$ background fraction $f_{\pi^{0}}$ that was subtracted from the pion data.
001702252 8564_ $$81411328$$s29510$$uhttps://cds.cern.ch/record/1702252/files/fig3.png$$y00005 The $x_\gamma$ dependence of the ratio of the measured differential cross section $d\sigma/dx_{\gamma}$ over the expected cross section for point-like particles. Top (bottom) panel: measurement with pion (muon) beam. The respective ratios contain the corrections described in the text. The bands denote the respective statistical uncertainties of the fit results shown by the solid lines. Error bars denote statistical uncertainties. The quality of the fits can be characterized by the values $\chi_{\pi}^2/NDF=22.0/18$ and $\chi_{\mu}^2/NDF=19.6/18$, respectively.
001702252 8564_ $$81411329$$s34587$$uhttps://cds.cern.ch/record/1702252/files/fig1d.png$$y00003 Comparison of the measured (black points with error bars) and simulated (red histograms) kinematic distributions for measurements with pion beam: (a) transverse momentum $p_{T}$ of the scattered pion; (b) energy balance $\Delta E$; (c) $|Q|$ distribution, featuring for the real data at higher values the contribution from strong interaction, which is not contained in the simulation; (d) invariant mass of the $\pi\gamma$ system. Kinematic cuts are indicated by vertical dashed lines.
001702252 8564_ $$81411330$$s32781$$uhttps://cds.cern.ch/record/1702252/files/fig1a.png$$y00000 Comparison of the measured (black points with error bars) and simulated (red histograms) kinematic distributions for measurements with pion beam: (a) transverse momentum $p_{T}$ of the scattered pion; (b) energy balance $\Delta E$; (c) $|Q|$ distribution, featuring for the real data at higher values the contribution from strong interaction, which is not contained in the simulation; (d) invariant mass of the $\pi\gamma$ system. Kinematic cuts are indicated by vertical dashed lines.
001702252 8564_ $$81411331$$s30438$$uhttps://cds.cern.ch/record/1702252/files/fig1b.png$$y00001 Comparison of the measured (black points with error bars) and simulated (red histograms) kinematic distributions for measurements with pion beam: (a) transverse momentum $p_{T}$ of the scattered pion; (b) energy balance $\Delta E$; (c) $|Q|$ distribution, featuring for the real data at higher values the contribution from strong interaction, which is not contained in the simulation; (d) invariant mass of the $\pi\gamma$ system. Kinematic cuts are indicated by vertical dashed lines.
001702252 8564_ $$81411332$$s27344$$uhttps://cds.cern.ch/record/1702252/files/fig1c.png$$y00002 Comparison of the measured (black points with error bars) and simulated (red histograms) kinematic distributions for measurements with pion beam: (a) transverse momentum $p_{T}$ of the scattered pion; (b) energy balance $\Delta E$; (c) $|Q|$ distribution, featuring for the real data at higher values the contribution from strong interaction, which is not contained in the simulation; (d) invariant mass of the $\pi\gamma$ system. Kinematic cuts are indicated by vertical dashed lines.
001702252 8564_ $$8880173$$s282677$$uhttps://cds.cern.ch/record/1702252/files/CERN-PH-EP-2014-109.pdf?subformat=pdfa$$xpdfa
001702252 8564_ $$81235001$$s1541796$$uhttps://cds.cern.ch/record/1702252/files/PhysRevLett.114.062002.pdf?subformat=pdfa$$xpdfa$$yAPS Open Access article
001702252 8564_ $$8879416$$s607045$$uhttps://cds.cern.ch/record/1702252/files/CERN-PH-EP-DRAFT-COMPASS-2014-005 - draft.pdf$$yDraft (restricted)$$zStamped by WebSubmit: 20/05/2014
001702252 9031_ $$aApproval requested for number CERN-PH-EP-2014-109$$bCERN-PH-EP-2014-109$$cEPPHAPP$$d2014-05-16 15:20:00$$e2014-05-23 15:20:[email protected]$$swaiting
001702252 9031_ $$aApproval requested for number CERN-PH-EP-2014-109$$bCERN-PH-EP-2014-109$$cEPPHAPP$$d2014-05-16 15:20:00$$e2014-05-23 15:20:[email protected]$$swaiting
001702252 9031_ $$aDocument approved$$bCERN-PH-EP-2014-109$$cEPPHAPP$$d2014-05-20 17:09:[email protected]$$sapproved
001702252 916__ $$sn$$w201421$$ya2015
001702252 960__ $$a13
001702252 980__ $$aCOMPASS_Papers
001702252 980__ $$aARTICLE
001702252 981__ $$a1983381

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