The ALICE experiment has measured the inclusive J/psi production in Pb-Pb collisions at root s(NN) = 2.76 TeV down to zero transverse momentum in the rapidity range 2.5 < y < 4. A suppression of the inclusive J/psi yield in Pb-Pb is observed with respect to the one measured in pp collisions scaled by the number of binary nucleon-nucleon collisions. The nuclear modification factor, integrated over the 0%-80% most central collisions, is 0.545 +/- 0.032(stat) +/- 0.083dsyst_ and does not exhibit a significant dependence on the collision centrality. These features appear significantly different from measurements at lower collision energies. Models including J/psi production from charm quarks in a deconfined partonic phase can describe our data.

J/psi Suppression at Forward Rapidity in Pb-Pb Collisions at root s(NN)=2.76 TeV / B., A., J., A., D., A., A. M., A., M. M., A., G. A., R., A. G., A., A., A., S. A., S., Z., A., A. A., M., N., A., S. U., A., A., A., D., A., B., A., R. A., M., A., A., A., A., E. A., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 109:(2012), p. 072301. [10.1103/PhysRevLett.109.072301]

J/psi Suppression at Forward Rapidity in Pb-Pb Collisions at root s(NN)=2.76 TeV

L. Cunqueiro;MEDDI, Franco;
2012

Abstract

The ALICE experiment has measured the inclusive J/psi production in Pb-Pb collisions at root s(NN) = 2.76 TeV down to zero transverse momentum in the rapidity range 2.5 < y < 4. A suppression of the inclusive J/psi yield in Pb-Pb is observed with respect to the one measured in pp collisions scaled by the number of binary nucleon-nucleon collisions. The nuclear modification factor, integrated over the 0%-80% most central collisions, is 0.545 +/- 0.032(stat) +/- 0.083dsyst_ and does not exhibit a significant dependence on the collision centrality. These features appear significantly different from measurements at lower collision energies. Models including J/psi production from charm quarks in a deconfined partonic phase can describe our data.
2012
lhc; nuclear collisions
01 Pubblicazione su rivista::01a Articolo in rivista
J/psi Suppression at Forward Rapidity in Pb-Pb Collisions at root s(NN)=2.76 TeV / B., A., J., A., D., A., A. M., A., M. M., A., G. A., R., A. G., A., A., A., S. A., S., Z., A., A. A., M., N., A., S. U., A., A., A., D., A., B., A., R. A., M., A., A., A., A., E. A., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 109:(2012), p. 072301. [10.1103/PhysRevLett.109.072301]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/552709
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