Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Heavy Ion Collision and QCD Phases IX

HK 40.7: Vortrag

Mittwoch, 16. März 2016, 18:15–18:30, S1/01 A01

Influence of parton shadowing on J/psi-to-Drell-Yan ratio at SPS and FAIR — •Partha Pratim Bhaduri — CBM Department, GSI, Planck Str. 1, 64291 Darmstadt, Germany — Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata - 700064, India

In relativistic heavy-ion collision experiments, J/psi suppression has long been considered as a direct signature of the onset of de-confinement transition leading to the formation of quark-gluon plasma (QGP). In the present work, we have employed a two component model for calculation of J/psi production cross section in nuclear collision. We report our analysis of the available data on J/psi-to-Drell-Yan production cross section ratio in proton-nucleus (p+A) and nucleus-nucleus (A+A) collisions, at SPS energies. For both J/psi and Drell-Yan production, nuclear modifications to the free nucleon structure functions are taken into account. Differences in quark and gluon shadowing leads to a new source of impact parameter dependence of the production ratio. For J/psi, once the final state interaction of the produced cc-bar pairs with the nuclear medium is incorporated, a satisfactory description of the data in both p+A and A+A collisions is obtained. Model calculations are extrapolated to predict the centrality dependence of J/psi-to-Drell-Yan ratio in the FAIR energy domain.