| Article | |
| Report number | arXiv:0906.5376 |
| Title | J/$\psi$ azimuthal anisotropy relative to the reaction plane in Pb-Pb collisions at 158 GeV per nucleon |
| Author(s) |
Prino, F. (Turin U. ; INFN, Turin) ; Alessandro, B. (Turin U. ; INFN, Turin) ; Alexa, C. (Bucharest, IFIN-HH) ; Arnaldi, R. (Turin U. ; INFN, Turin) ; Atayan, M. (Yerevan Phys. Inst.) ; Beole, S. (Turin U. ; INFN, Turin) ; Boldea, V. (Bucharest, IFIN-HH) ; Bordalo, P. (LIP, Lisbon) ; Borges, G. (LIP, Lisbon) ; Castanier, C. (Clermont-Ferrand U.) ; Castor, J. (Clermont-Ferrand U.) ; Chaurand, B. (Ecole Polytechnique ; Orsay, IPN) ; Cheynis, B. (Lyon, IPN) ; Chiavassa, E. (Turin U. ; INFN, Turin) ; Cicalo, C. (Cagliari U. ; INFN, Cagliari) ; Comets, M.P. (Orsay, IPN) ; Constantinescu, S. (Bucharest, IFIN-HH) ; Cortese, P. (Turin U., Alessandria ; INFN, Turin) ; De Falco, A. (Cagliari U. ; INFN, Cagliari) ; De Marco, N. (Turin U. ; INFN, Turin) ; Dellacasa, G. (Turin U., Alessandria ; INFN, Turin) ; Devaux, A. (Clermont-Ferrand U.) ; Dita, S. (Bucharest, IFIN-HH) ; Fargeix, J. (Clermont-Ferrand U.) ; Force, P. (Clermont-Ferrand U.) ; Gallio, M. (Turin U. ; INFN, Turin) ; Gerschel, C. (Orsay, IPN) ; Giubellino, P. (Turin U. ; INFN, Turin) ; Golubeva, M.B. (Moscow, INR) ; Grigoryan, A.A. (Yerevan Phys. Inst.) ; Grigoryan, S. (Yerevan Phys. Inst.) ; Guber, F.F. (Moscow, INR) ; Guichard, A. (Lyon, IPN) ; Gulkanyan, H. (Yerevan Phys. Inst.) ; Idzik, M. (Cracow, Inst. Computer Sci.) ; Jouan, D. (Orsay, IPN) ; Karavicheva, T.L. (Moscow, INR) ; Kluberg, L. (CERN ; Ecole Polytechnique ; Orsay, IPN) ; Kurepin, A.B. (Moscow, INR) ; Le Bornec, Y. (Orsay, IPN) ; Lourenco, C. (CERN) ; Mac Cormick, M. (Orsay, IPN) ; Marzari-Chiesa, A. (Turin U. ; INFN, Turin) ; Masera, M. (Turin U. ; INFN, Turin) ; Masoni, A. (Cagliari U. ; INFN, Cagliari) ; Monteno, M. (Turin U. ; INFN, Turin) ; Musso, A. (Turin U. ; INFN, Turin) ; Petiau, P. (Ecole Polytechnique ; Orsay, IPN) ; Piccotti, A. (Turin U. ; INFN, Turin) ; Pizzi, J.R. (Lyon, IPN) ; Puddu, G. (Cagliari U. ; INFN, Cagliari) ; Quintans, C. (LIP, Lisbon) ; Ramello, L. (Turin U., Alessandria ; INFN, Turin) ; Ramos, S. (LIP, Lisbon) ; Riccati, L. (Turin U. ; INFN, Turin) ; Santos, H. (LIP, Lisbon) ; Saturnini, P. (Clermont-Ferrand U.) ; Scomparin, E. (Turin U. ; INFN, Turin) ; Serci, S. (Cagliari U. ; INFN, Cagliari) ; Shahoyan, R. (LIP, Lisbon) ; Sigaudo, F. (Turin U. ; INFN, Turin) ; Sitta, M. (Turin U., Alessandria ; INFN, Turin) ; Sonderegger, P. (CERN) ; Tarrago, X. (Orsay, IPN) ; Topilskaya, N.S. (Moscow, INR) ; Usai, G.L. (Cagliari U. ; INFN, Cagliari) ; Vercellin, E. (Turin U. ; INFN, Turin) ; Villatte, L. (Orsay, IPN) ; Willis, N. (Orsay, IPN) ; Wu, T. (Orsay, IPN) |
| Affiliation | (CERN) |
| Publication | 2009 |
| Imprint | 01 Jul 2009 |
| Number of pages | 6 p, 6 |
| Note | Comments: proceedings of HP08 conference proceedings of HP08 conference corrected a typo in one equation |
| In: | Eur. Phys. J. C 61 (2009) 853-858 |
| In: | 3rd International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Isla de la Toja, Spain, 8 - 14 Jun 2008, pp.853-858 |
| DOI | 10.1140/epjc/s10052-009-0907-4 |
| Subject category | Nuclear Physics - Experiment |
| Accelerator/Facility, Experiment | CERN SPS ; NA50 |
| Abstract | The J/$\psi$ azimuthal distribution relative to the reaction plane has been measured by the NA50 experiment in Pb-Pb collisions at 158 GeV/nucleon. Various physical mechanisms related to charmonium dissociation in the medium created in the heavy ion collision are expected to introduce an anisotropy in the azimuthal distribution of the observed J/$\psi$ mesons at SPS energies. Hence, the measurement of J/$\psi$ elliptic anisotropy, quantified by the Fourier coefficient v$_2$ of the J/$\psi$ azimuthal distribution relative to the reaction plane, is an important tool to constrain theoretical models aimed at explaining the anomalous J/$\psi$ suppression observed in Pb-Pb collisions. We present the measured J/$\psi$ yields in different bins of azimuthal angle relative to the reaction plane, as well as the resulting values of the Fourier coefficient v$_{2}$ as a function of the collision centrality and of the J/$\psi$ transverse momentum. The reaction plane has been estimated from the azimuthal distribution of the neutral transverse energy detected in an electromagnetic calorimeter. The analysis has been performed on a data sample of about 100 000 events, distributed in five centrality or p$_{\rm T}$ sub-samples. The extracted v$_{2}$ values are significantly larger than zero for non-central collisions and are seen to increase with p$_{\rm T}$. |
| Copyright/License | License |
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