Speaker
Biswarup Paul
(Saha Institute of Nuclear Physics (IN))
Description
The inclusive J/$\psi$ differential production cross-sections and nuclear modification factor as a function of $p_{\rm T}$ in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV have been calculated at forward rapidity (2.5 $<$ $y$ $<$ 4) and compared with the results reported by the ALICE Collaborations [arXiv:1506.08804v1]. The calculations have been carried out by estimating the pp cross-sections at $\sqrt{s}$ = 2.76 TeV within the framework of NRQCD [J. Phys. G: Nucl. Part. Phys. 42 065101 (2015)]. The cross-sections have been scaled by the Glauber model for Pb-Pb collisions and convoluted with the survival probability fraction due to color screening [Phys. Rev. D 37, 1851 (1988)]. The feed-down contributions from $\psi$(2S), $\chi_{c}$ and $B$ mesons to J/$\psi$ have been included to compare the inclusive results from ALICE. The comparison with experimental values shows a good agreement beyond $p_{\rm T}$ = 4 GeV for the three centrality bins namely, 0%$-$20%, 20%$-$40% and 40%$-$90%. These results indicate that the cold nuclear matter and recombination effects on J/$\psi$ production at forward rapidities in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV is negligible for $p_{\rm T}$ $>$ 4 GeV. Thus, in the high $p_{\rm T}$ domain ($p_{\rm T}$ $>$ 4 GeV), the observed suppression in the J/$\psi$ yield by ALICE Collaboration can solely be accounted by color screening. Results will also be shown for Pb-Pb collisions at higher energies.
| On behalf of collaboration: | NONE |
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Primary author
Biswarup Paul
(Saha Institute of Nuclear Physics (IN))
Co-authors
Mahatsab Mandal
(Saha Institute of Nuclear Physics (IN))
Pradip Kumar Roy
(Saha Institute of Nuclear Physics (IN))
Sukalyan Chattopadhyay
(Saha Institute of Nuclear Physics (IN))
