J/&#968; azimuthal anisotropy relative to the reaction plane in Pb-Pb collisions at 158 GeV per nucleon

Prino, F.; Alessandro, B.; Alexa, C.; Arnaldi, R.; Atayan, M.; Beole, S.; Boldea, V.; Bordalo, P.; Borges, G.; Castanier, C.; Castor, J.; Chaurand, B.; Cheynis, B.; Chiavassa, E.; Cicalo, C.; Comets, M. P.; Constantinescu, S.; Cortese, P.; De Falco, Alessandro; De Marco, N.; Dellacasa, G.; Devaux, A.; Dita, S.; Fargeix, J.; Force, P.; Gallio, M.; Gerschel, C.; Giubellino, P.; Golubeva, M. B.; Grigoryan, A. A.; Grigoryan, S.; Guber, F. F.; Guichard, A.; Gulkanyan, H.; Idzik, M.; Jouan, D.; Karavicheva, T. L.; Kluberg, L.; Kurepin, A. B.; Le Bornec, Y.; Lourenco, C.; Mac Cormick, M.; Marzari Chiesa, A.; Masera, M.; Masoni, A.; Monteno, M.; Musso, A.; Petiau, P.; Piccotti, A.; Pizzi, J. R.; Puddu, Giovanna; Quintans, C.; Ramello, L.; Ramos, S.; Riccati, L.; Santos, H.; Saturnini, P.; Scomparin, E.; Serci, S.; Shahoyan, R.; Sigaudo, F.; Sitta, M.; Sonderegger, P.; Tarrago, X.; Topilskaya, N. S.; Usai, G. L.; Vercellin, E.; Villatte, L.; Willis, N.; Wu, T.

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 distri...

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Titolo:	J/ψ azimuthal anisotropy relative to the reaction plane in Pb-Pb collisions at 158 GeV per nucleon
Autori:	F. PRINO B. ALESSANDRO C. ALEXA R. ARNALDI M. ATAYAN S. BEOLE V. BOLDEA P. BORDALO G. BORGES C. CASTANIER J. CASTOR B. CHAURAND B. CHEYNIS E. CHIAVASSA C. CICALO M. P. COMETS S. CONSTANTINESCU P. CORTESE DE FALCO, ALESSANDRO N. DE MARCO G. DELLACASA A. DEVAUX S. DITA J. FARGEIX P. FORCE M. GALLIO C. GERSCHEL P. GIUBELLINO M. B. GOLUBEVA A. A. GRIGORYAN S. GRIGORYAN F. F. GUBER A. GUICHARD H. GULKANYAN M. IDZIK D. JOUAN T. L. KARAVICHEVA L. KLUBERG A. B. KUREPIN Y. LE BORNEC C. LOURENCO M. MAC CORMICK A. MARZARI CHIESA M. MASERA A. MASONI M. MONTENO A. MUSSO P. PETIAU A. PICCOTTI J. R. PIZZI PUDDU, GIOVANNA C. QUINTANS L. RAMELLO S. RAMOS L. RICCATI H. SANTOS P. SATURNINI E. SCOMPARIN S. SERCI R. SHAHOYAN F. SIGAUDO M. SITTA P. SONDEREGGER X. TARRAGO N. S. TOPILSKAYA USAI, GIANLUCA E. VERCELLIN L. VILLATTE N. WILLIS T. WU mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2009
Abstract:	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 distri...
Handle:	http://hdl.handle.net/11584/22676
ISBN:	1434-6044
Tipologia:	4.1 Contributo in Atti di convegno

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