Azimuthal anisotropy of photon and charged particle emission in Pb-208 + Pb-208 collisions at 158-A-GeV/c

Aggarwal, M.M.; Avdeitchikov, V.; Kurata, M.; Lebedev, A.; Sambyal, S.S.; Martin, M.; Rao, N.K.; Morrison, D.; Mahapatra, D.P.; Schmidt, H.-R.; Peitzmann, T.; Mora, M.-J.; Sood, G.; Steinberg, P.; Sibiriak, I.; Stenlund, E.; Reygers, K.; Tykarski, L.; Antonenko, V.; Astakhov, V.; Awes, T.C.; Guskov, B.; Siemiarczuk, T.; Martinez, G.; Gavrishchuk, O.; Silvermyr, D.; Mishra, G.C.; Nystrand, J.; Dubey, A.K.; Plasil, F.; Nandi, B.K.; Dutta Majumdar, M.R.; Phatak, S.C.; Sumbera, M.; El Chenawi, K.; Wyslouch, B.; Miake, Y.; Glasow, R.; Ahammed, Z.; Hrivnacova, I.; Purschke, M.L.; Nayak, T.K.; Nayak, S.K.; Nilsson, P.; Stefanek, G.; Sorensen, S.P.; Ghosh, T.K.; van Nieuwenhuizen, G.J.; Roland, G.; Bernier, T.; Viyogi, Y.P.; Nomokonov, P.; Peressounko, D.; Schutz, Y.; Pinganaud, W.; Nishimura, S.; Decowski, M.P.; Soderstrom, K.; Slavine, N.; Bathe, S.; Karpio, K.; Gutbrod, H.H.; Ippolitov, M.; Otterlund, I.; Shabratova, G.; Roy, C.; Raniwala, R.; Garpman, S.; Fokin, S.; Santo, R.; Kolb, B.W.; van Eijndhoven, N.; Geurts, F.J.M.; Karadjev, K.; Delagrange, H.; Schlagheck, H.; Batiounia, B.; Donni, P.; Kulinich, P.; van der Pijll, E.C.; Young, G.R.; Kosarev, I.; Raniwala, S.; Petracek, V.; Bhatia, V.S.; Rosselet, L.; Manko, V.; Roufanov, I.; Baba, P.V.K.S.; Retiere, F.; Chattopadhyay, S.; Tsvetkov, A.; Stankus, P.; Blume, C.; Voros, S.; Oskarsson, A.; Mukhopadhyay, D.S.; Badyal, S.K.; Frolov, V.; Maximov, A.; Nikolaev, S.; Carlen, L.; Gustafsson, H.A.; Nianine, A.; Bucher, D.; Luquin, L.; Mohanty, B.; Angelis, A.L.S.; Shah, T.H.; Vodopianov, A.S.; Nikitine, V.; Vinogradov, A.; Naef, H.; Kalechofsky, H.; Rubio, J.M.; Enosawa, K.; Moukhanova, T.; Lohner, H.; Sinha, B.C.; Ganti, M.S.; Koutcheryaev, I.; Rak, J.; Busching, H.; Sato, S.; Kugler, A.; Svensson, T.; Areev, V.

doi:10.1140/epjc/s2005-02249-2

000744607 001__ 744607
000744607 003__ SzGeCERN
000744607 005__ 20240510153615.0
000744607 0248_ $$aoai:cds.cern.ch:744607$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN$$qcerncds:nucl-ex
000744607 0247_ $$2DOI$$a10.1140/epjc/s2005-02249-2
000744607 035__ $$9SPIRES$$a5909600
000744607 035__ $$9Inspire$$a652826
000744607 037__ $$9arXiv$$anucl-ex/0406022$$cnucl-ex
000744607 035__ $$9arXiv$$aoai:arXiv.org:nucl-ex/0406022
000744607 041__ $$aeng
000744607 100__ $$aAggarwal, M.M.
000744607 245__ $$aAzimuthal anisotropy of photon and charged particle emission in Pb-208 + Pb-208 collisions at 158-A-GeV/c
000744607 246__ $$aPB + PB
000744607 246__ $$aAzimuthal Anisotropy of Photon and Charged Particle Emission in Pb+Pb Collisions at 158 A GeV/c
000744607 260__ $$c2005
000744607 269__ $$c2004-06
000744607 300__ $$a10 p
000744607 500__ $$9arXiv$$a8 pages and 6 figures. The manuscript has undergone a major revision. The unwanted correlations were enhanced in the random subdivision method used in the earlier version. The present version uses the more established method of division into subevents separated in rapidity to minimise short range correlations. The observed results for charged particles are in agreement with results from the other experiments. The observed anisotropy in photons is explained using flow results of pions and the correlations arising due to the decay of the neutral pions
000744607 520__ $$aThe azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in Pb + Pb collisions at 158 A GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities.
000744607 520__ $$9Inspire$$aThe azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in Pb + Pb collisions at 158 A GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities.
000744607 542__ $$3publication$$dSpringer-Verlag / Societa Italiana di Fisica$$g2005
000744607 595__ $$aLANL EDS
000744607 595__ $$agiva
000744607 595__ $$aFor annual report
000744607 65017 $$2SzGeCERN$$aNuclear Physics - Experiment
000744607 693__ $$aCERN SPS$$eWA98
000744607 695__ $$9LANL EDS$$aNuclear Experiment
000744607 690C_ $$aARTICLE
000744607 690C_ $$aCERN
000744607 700__ $$aAhammed, Z.
000744607 700__ $$aAngelis, A.L.S.
000744607 700__ $$aAntonenko, V.
000744607 700__ $$aAreev, V.
000744607 700__ $$aAstakhov, V.
000744607 700__ $$aAvdeitchikov, V.
000744607 700__ $$aAwes, T.C.
000744607 700__ $$aBaba, P.V.K.S.
000744607 700__ $$aBadyal, S.K.
000744607 700__ $$aBathe, S.
000744607 700__ $$aBatiounia, B.
000744607 700__ $$aBernier, T.
000744607 700__ $$aBhatia, V.S.
000744607 700__ $$aBlume, C.
000744607 700__ $$aBucher, D.
000744607 700__ $$aBusching, H.
000744607 700__ $$aCarlen, L.
000744607 700__ $$aChattopadhyay, S.
000744607 700__ $$aDecowski, M.P.
000744607 700__ $$aDelagrange, H.
000744607 700__ $$aDonni, P.
000744607 700__ $$aDutta Majumdar, M.R.
000744607 700__ $$aDubey, A.K.
000744607 700__ $$aEl Chenawi, K.
000744607 700__ $$aEnosawa, K.
000744607 700__ $$aFokin, S.
000744607 700__ $$aFrolov, V.
000744607 700__ $$aGanti, M.S.
000744607 700__ $$aGarpman, S.
000744607 700__ $$aGavrishchuk, O.
000744607 700__ $$aGeurts, F.J.M.
000744607 700__ $$aGhosh, T.K.
000744607 700__ $$aGlasow, R.
000744607 700__ $$aGuskov, B.
000744607 700__ $$aGustafsson, H.A.
000744607 700__ $$aGutbrod, H.H.
000744607 700__ $$aHrivnacova, I.
000744607 700__ $$aIppolitov, M.
000744607 700__ $$aKalechofsky, H.
000744607 700__ $$aKaradjev, K.
000744607 700__ $$aKarpio, K.
000744607 700__ $$aKolb, B.W.
000744607 700__ $$aKosarev, I.
000744607 700__ $$aKoutcheryaev, I.
000744607 700__ $$aKugler, A.
000744607 700__ $$aKulinich, P.
000744607 700__ $$aKurata, M.
000744607 700__ $$aLebedev, A.
000744607 700__ $$aLohner, H.
000744607 700__ $$aLuquin, L.
000744607 700__ $$aMahapatra, D.P.
000744607 700__ $$aManko, V.
000744607 700__ $$aMartin, M.
000744607 700__ $$aMartinez, G.
000744607 700__ $$aMaximov, A.
000744607 700__ $$aMiake, Y.
000744607 700__ $$aMishra, G.C.
000744607 700__ $$aMohanty, B.
000744607 700__ $$aMora, M.-J.
000744607 700__ $$aMorrison, D.
000744607 700__ $$aMoukhanova, T.
000744607 700__ $$aMukhopadhyay, D.S.
000744607 700__ $$aNaef, H.
000744607 700__ $$aNandi, B.K.
000744607 700__ $$aNayak, S.K.
000744607 700__ $$aNayak, T.K.
000744607 700__ $$aNianine, A.
000744607 700__ $$aNikitine, V.
000744607 700__ $$aNikolaev, S.
000744607 700__ $$aNilsson, P.
000744607 700__ $$aNishimura, S.
000744607 700__ $$aNomokonov, P.
000744607 700__ $$aNystrand, J.
000744607 700__ $$aOskarsson, A.
000744607 700__ $$aOtterlund, I.
000744607 700__ $$aPeitzmann, T.
000744607 700__ $$aPeressounko, D.
000744607 700__ $$aPetracek, V.
000744607 700__ $$aPhatak, S.C.
000744607 700__ $$aPinganaud, W.
000744607 700__ $$aPlasil, F.
000744607 700__ $$aPurschke, M.L.
000744607 700__ $$aRak, J.
000744607 700__ $$aRaniwala, R.
000744607 700__ $$aRaniwala, S.
000744607 700__ $$aRao, N.K.
000744607 700__ $$aRetiere, F.
000744607 700__ $$aReygers, K.
000744607 700__ $$aRoland, G.
000744607 700__ $$aRosselet, L.
000744607 700__ $$aRoufanov, I.
000744607 700__ $$aRoy, C.
000744607 700__ $$aRubio, J.M.
000744607 700__ $$aSambyal, S.S.
000744607 700__ $$aSanto, R.
000744607 700__ $$aSato, S.
000744607 700__ $$aSchlagheck, H.
000744607 700__ $$aSchmidt, H.-R.
000744607 700__ $$aSchutz, Y.
000744607 700__ $$aShabratova, G.
000744607 700__ $$aShah, T.H.
000744607 700__ $$aSibiriak, I.
000744607 700__ $$aSiemiarczuk, T.
000744607 700__ $$aSilvermyr, D.
000744607 700__ $$aSinha, B.C.
000744607 700__ $$aSlavine, N.
000744607 700__ $$aSoderstrom, K.
000744607 700__ $$aSood, G.
000744607 700__ $$aSorensen, S.P.
000744607 700__ $$aStankus, P.
000744607 700__ $$aStefanek, G.
000744607 700__ $$aSteinberg, P.
000744607 700__ $$aStenlund, E.
000744607 700__ $$aSumbera, M.
000744607 700__ $$aSvensson, T.
000744607 700__ $$aTsvetkov, A.
000744607 700__ $$aTykarski, L.
000744607 700__ $$avan der Pijll, E.C.
000744607 700__ $$avan Eijndhoven, N.
000744607 700__ $$avan Nieuwenhuizen, G.J.
000744607 700__ $$aVinogradov, A.
000744607 700__ $$aViyogi, Y.P.
000744607 700__ $$aVodopianov, A.S.
000744607 700__ $$aVoros, S.
000744607 700__ $$aWyslouch, B.
000744607 700__ $$aYoung, G.R.
000744607 710__ $$gWA98 Collaboration
000744607 710__ $$5PH-EP
000744607 773__ $$c287-296$$pEur. Phys. J. C$$v41$$y2005
000744607 8564_ $$uhttp://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=nucl-ex&id=0406022$$yAccess to fulltext document
000744607 8564_ $$828074$$s298580$$uhttps://cds.cern.ch/record/744607/files/0406022.pdf$$yAccess to fulltext document
000744607 8564_ $$82529221$$s218394$$uhttps://cds.cern.ch/record/744607/files/arXiv:nucl-ex_0406022.pdf
000744607 8564_ $$82529217$$s19792$$uhttps://cds.cern.ch/record/744607/files/phiwrtpsi.png$$y00002 Distributions of azimuthal angles with respect to the first and second order event plane for the centrality class defined by 225.5 $\leq$ E$_T$ $\leq$ 298.6. (a) for charged particle hits in the SPMD and (b) for photons in the PMD, both in the pseudorapidity region 3.25 $\leq \eta \leq$ 3.75.
000744607 8564_ $$82529218$$s34213$$uhttps://cds.cern.ch/record/744607/files/v12pmdwithvzerofit.png$$y00006 (a) First order, $v_1^{PMD}$, and (b) second order, $v_2^{PMD}$, photon anisotropy coefficients in the pseudorapidity region 3.25 $\leq \eta \leq$ 3.75 for different centralities are shown by filled triangles. Statistical and systematical errors are added in quadrature and shown as bars on the filled triangles. Open triangles are the most probable values of $v_n^{PMD}$ as expected from the simulation. The shaded regions indicate the simulation uncertainties as described in section 5.4. The open circles show the calculated values of $v_n^{PMD}(v_n(\pi)=0)$ assuming an isotropic distribution of pions with the dashed curve indicating a smooth polynomial fit to the open points. Note, however, that $v_n^{PMD}(v_n(\pi)=0)$ can not be directly subtracted from the $v_n^{PMD}(v_n(\pi) > 0)$ to obtain the anisotropy flow coefficents $v_n$, as explained in the text.
000744607 8564_ $$82529219$$s24060$$uhttps://cds.cern.ch/record/744607/files/psidist.png$$y00001 Acceptance corrected distributions of (a) the first order event plane angle, $\psi'_1$, of the two subevents for the charged particles hits in the SPMD and the photons in the PMD in the region 3.25 $\leq \eta \leq$ 3.75 for the centrality class defined by 225.5 $\leq$ E$_T$ $\leq$ 298.6. (b)The same for second order event plane angle, $\psi'_2$.
000744607 8564_ $$82529220$$s18151$$uhttps://cds.cern.ch/record/744607/files/v2roots.png$$y00005 Second order coefficient for different centre of mass energies. The results of the present work are for charged particles and are shown for two different centrality classes. The ordinates of CERES, NA49, STAR and PHENIX results have been shifted slightly for clarity. The error bars on WA98 points indicate the statistical and systematical errors added in quadrature. E877, STAR, PHENIX and PHOBOS $v_2$ values are for charged particles. The centrality cuts for all experiments are comparable.
000744607 8564_ $$82529222$$s18233$$uhttps://cds.cern.ch/record/744607/files/granv1v2.png$$y00003 The ratio $v_n^{hits}/v_n$ for different number of occupied cells. $x$ is the number of occupied cells scaled with the total number of cells. Different symbols correspond to different initial values of $v_n$. The solid line represents Eq.~\ref{granrat}.
000744607 8564_ $$82529223$$s9563$$uhttps://cds.cern.ch/record/744607/files/fig00000.png$$y00000 noimg: Centrality selections used in the present analysis based on the measured total transverse energy. The corresponding fraction of the minimum bias cross section, number of participants, and the average photon and charged particle multiplicities measured in the pseudo-rapidity interval $3.25\le \eta\le 3.75$ are given for each centrality selection.: Contribution to systematic error from various sources for the simulated values of both orders of anisotropy of the N$_{photons}$ distributions for the centrality selection corresponding to 20-30\% of minimum bias cross section.
000744607 8564_ $$82529224$$s22223$$uhttps://cds.cern.ch/record/744607/files/v12spmd.png$$y00004 Anisotropy coefficients of the azimuthal distributions of charged particles in the pseudorapidity region 3.25 $\leq \eta \leq$ 3.75 for different centralities characterised by the measured transverse energy. (a) First order, $v_1$, where the shaded region indicates the extent of the total systematic error due to uncertainty in the vertex position. (b) second order, $v_2$.
000744607 902__ $$aWarsaw, Inst. Nucl. Studies
000744607 902__ $$aUtrecht U.
000744607 902__ $$aTsukuba U.
000744607 902__ $$aRez, Nucl. Phys. Inst.
000744607 902__ $$aOak Ridge
000744607 902__ $$aSUBATECH, Nantes
000744607 902__ $$aMunster U.
000744607 902__ $$aKurchatov Inst., Moscow
000744607 902__ $$aLund U.
000744607 902__ $$aTennessee U.
000744607 902__ $$aJammu U.
000744607 902__ $$aRajasthan U.
000744607 902__ $$aGroningen, KVI
000744607 902__ $$aGeneva U.
000744607 902__ $$aDubna, JINR
000744607 902__ $$aDarmstadt, GSI
000744607 902__ $$aPanjab U.
000744607 902__ $$aMIT, LNS
000744607 902__ $$aCalcutta, VECC
000744607 902__ $$aBhubaneswar, Inst. Phys.
000744607 916__ $$sn$$w200426$$ya2007
000744607 961__ $$c20100417$$h1137$$lCER01$$x20040622
000744607 963__ $$aPUBLIC
000744607 960__ $$a13
000744607 970__ $$a002456060CER
000744607 980__ $$aARTICLE

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