Abstract
We present a measurement of inclusive J/ψ production at mid-rapidity (|y|<1) in p+p collisions at a center-of-mass energy of s=200 GeV with the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The differential production cross section for J/ψ as a function of transverse momentum (pT) for 0<pT<14GeV/c and the total cross section are reported and compared to calculations from the color evaporation model and the non-relativistic Quantum Chromodynamics model. The dependence of J/ψ relative yields in three pT intervals on charged-particle multiplicity at mid-rapidity is measured for the first time in p+p collisions at s=200 GeV and compared with that measured at s=7 TeV, PYTHIA8 and EPOS3 Monte Carlo generators, and the Percolation model prediction.
Highlights
Quarkonia are bound states of heavy quark–antiquark pairs ( Q Q )
We present new results of inclusive√J /ψ production at mid-rapidity (| y| < 1) in p+p collisions at s = 200 GeV with the STAR experiment at Relativistic Heavy Ion Collider (RHIC) [16]
Inclu√sive J /ψ production at mid-rapidity | y| < 1 in p+p collisions at s = 200 GeV is studied through the J /ψ → e+e− channel with the STAR experiment
Summary
Quarkonia are bound states of heavy quark–antiquark pairs ( Q Q ). Collective expansion implemented in EPOS3 MC generator [14] is found to modify the pT distribu√tion of final state particles in high multiplicity p+p collisions at s = 7 TeV, producing a fasterthan-linear increase for D-meson relative yields at intermediate and high pT [8] Such an effect is expected to be small at RHIC energies. The percolation model [15] produces particles through interactions of color strings, which are more suppressed for soft processes than hard processes due to the different size of the color strings It can produce a fasterthan-linear increase in relative yields of heavy flavor particles with nch that is qualitatively consistent with the LHC results. These results are compared to calculations from various theoretical models and MC generators
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