$J/\psi$ production at high transverse momenta in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV

The STAR collaboration
Phys.Lett.B 722 (2013) 55-62, 2013.

Abstract (data abstract)
We report $J/\psi$ spectra for transverse momenta $p_{T}$> 5 GeV/c at mid-rapidity in p+p and Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.The inclusive $J/\psi$ spectrum and the extracted B-hadron feed-down are compared to models incorporating different production mechanisms. We observe significant suppression of the $J/\psi$ yields for $p_{T}$ > 5 GeV/c in 0-30% Au+Au collisions relative to the p+p yield scaled by the number of binary nucleon-nucleon collisions in Au+Au collisions. In 30-60% collisions, no such suppression is observed.The level of suppression is consistently less than that of high-$p_{T}$ $\pi^{\pm}$ and low-$p_{T}$ $J/\psi$.

  • Figure 2

    Data from Figure 2


    (Color online.) The invariant $J/\psi$ cross section versus $p_{T}$ in p+p collisions at $\sqrt{s}$ = 200 GeV. The vertical bars...

  • Figure 3

    Data from Figure 3


    (Color online.) The fraction of $B \rightarrow J/\psi$ over the inclusive $J/\psi$ yield in $p+p$ collisions. The FONLL+CEM model calculation...

  • Figure 4

    Data from Figure 4


    $J/\psi$ $p_{T}$ distributions in Au+Au collisions with different centralities at $\sqrt{s_{NN}}$ = 200 GeV. For clarity, the data and curves...

  • Figure 5

    Data from Figure 5


    (Color online.) $J/\psi$ RAA versus pT for several centrality bins for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The statistical...

  • Figure 6

    Data from Figure 6


    (Color online) $R_{AA}$ versus $N_{part}$ for high-$p_{T}$ $J/\psi$ in comparison with a) low-$p_{T}$ $J/\psi$ data from PHENIX [6], and high-$p_{T}$...

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