Anti-shadowing Effect on Charmonium Production at a Fixed-target Experiment Using LHC Beams

Abstract

We investigate charmonium production in Pb+Pb collisions at LHC beam energy $E_{\text{lab}}$=2.76 A TeV at fixed-target experiment ($\sqrt{s_{\text{NN}}}$=72 GeV). In the frame of a transport approach including cold and hot nuclear matter effects on charmonium evolution, we focus on the anti-shadowing effect on the nuclear modification factors $R_{AA}$ and $r_{AA}$ for the $J/\psi$ yield and transverse momentum. The yield is more suppressed at less forward rapidity ($y_{\text{lab}}\simeq$2) than that at very forward rapidity ($y_{\text{lab}}\simeq$4) due to the shadowing and anti-shadowing in different rapidity bins.

Comments: 7 pages, 3 figures; submitted to Advances in High Energy Physics. arXiv admin note: text overlap with arXiv:1409.5559