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$\rm{J}/\psi$ production at low transverse momentum in p+p and d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

The STAR collaboration
Phys.Rev.C 93 (2016) 064904, 2016.

Abstract (data abstract)
BNL-RHIC. We report on the measurement of $\rm{J}/\psi$ production in the dielectron channel at mid-rapidity (|y|<1) in p+p and d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider. The transverse momentum $p_{T}$ spectra in p+p for $p_{T}$ < 4 GeV/c and d+Au collisions for $p_{T}$ < 3 GeV/c are presented. These measurements extend the STAR coverage for $\rm{J}/\psi$ production in p+p collisions to low $p_{T}$. The $<p_{T}^{2}>$ from the measured $\rm{J}/\psi$ invariant cross section in p+p and d+Au collisions are evaluated and compared to similar measurements at other collision energies. The nuclear modification factor for $\rm{J}/\psi$ is extracted as a function of $p_{T}$ and collision centrality in d+Au and compared to model calculations using the modified nuclear Parton Distribution Function and a final-state $\rm{J}/\psi$ nuclear absorption cross section.

  • Table 1

    Data from Figure 10


    The mean square of $p_T$.

  • Table 2

    Data from Figure


    Nuclear absorption cross section.

  • Table 3

    Data from Figure 13


    The nuclear modicifation factor vs. $p_T$ for $J\psi$ with |y| < 1 in 0-100 percent central d+Au collisions.

  • Table 4

    Data from Figure 11


    Nuclear modicifation factor vs. N_coll $J\psi$ with|y|<1 and pT < 3 GeV/c in d Au collisions.

  • Table 5

    Data from Figure 9a


    The invariant cross section versus transverse momentum for J/$\psi$ with $|y|\lt 1$ in $p+p$ collisions.

  • Table 6

    Data from Figure 9b


    The invariant yield versus transverse momentum for $J/\Psi$ with |y| < 1 in 0 - 100 percent central d+Au collisions.

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