J/Psi Production by Charm Quark Coalescence

Abstract

Production of $c\bar{c}$ pairs in elementary hadron-hadron collisions is introduced in a simulation of relativistic heavy ion collisions. Coalescence of charmed quarks and antiquarks into various charmonium states is performed and the results are compared to PHENIX J$/\psi$ Au+Au data. The $\chi$ and $\psi$' bound states must be included as well as the ground state J$/\psi$, given the appreciable feeding from the excited states down to the J$/\psi$ via gamma decays. Charmonium coalescence is found to take place at relatively late times: generally after $c$($\bar{c}$)-medium interactions have ceased. Direct production of charmonia through hadron-hadron interactions, {\it ie.} without explicit presence of charm quarks, occurring only at early times, is suppressed by collisions with comoving particles and accounts for some $\sim 5\%$ of the total J$/\psi$ production. Coalescence is especially sensitive to the level of open charm production, scaling naively as $n_{c\bar{c}}^2$. The J$/\psi$ transverse momentum distribution is dependent on the charm quark transverse momentum distribution and early charm quark-medium interaction, thus providing a glimpse of the initial collision history.

19 pages, 10 figures

References in corpus (11)

• J/psi Production vs Centrality, Transverse Momentum, and Rapidity in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Measurement of high-p_T Single Electrons from Heavy-Flavor Decays in p+p Collisions at sqrt(s) = 200 GeV
• Open charm yields in d+Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Momentum spectra of charmonium produced in a quark-gluon plasma
• Single Electrons from Heavy Flavor Decays in p+p Collisions at sqrt(s) = 200 GeV
• Time Evolution of Jets and Perturbative Color Neutralization
• Quark Coalescence and Charm(onium) in QGP
• Cronin Effect and High Transver Momentum Suppression in D+Au Collisions
• Suppression of High Transverse Momentum ${\pi }^0$ Spectra in Au+Au Collisions at RHIC
• Charmed hadron signals of partonic medium
• Elliptical Flow in Relativistic Ion Collisions at s^(1/2)= 200 A GeV

Cited by in corpus (3)

• The production of primordial $J/\psi$ in p+p and relativistic heavy-ion collisions
• Production of J/$\Psi$-Particles at RHIC and LHC energies: An Alternative `Psi'-chology
• Ansatzs, Assumptions and Production of J/$\Psi$-Particles: A Non-`Charmed' Approach vs. the `Charmed' Ones