Hadronic $J/\psi$ Regeneration in Pb+Pb Collisions

Abstract

We make use of published yields for $D$-mesons and $J/\psi$ in Pb+Pb collisions at ALICE and a schematic description of the expansion of the hadron gas to study $D$-meson collisions during the hadronic break-up phase as a production mechanism for charmonium in relativistic heavy ion collisions at the Large Hadron Collider. Our calculation is based on chemical reaction rates with thermal cross sections for an effective meson interaction among pseudoscalar and vector mesons. We find that due to regeneration, the newly measured $J/\psi$ yields are consistent with anywhere from roughly $25\%$ to $110\%$ of the total yield present at hadronization time. This allows us to bound the fractional abundance of $J/\psi$ immediately after hadronization: $0.28\le \frac{d{N}_0^{J/\psi }/dy}{d{N}_{\mathrm{eq}}^{J/\psi }/dy}\le 1.13$. Our results are robust under the relaxation of the particulars of our schematic description and imply that it will be difficult to distinguish regeneration during hadronization from regeneration by final-state hadronic interactions. Therefore, regeneration must be taken into account when modelling.

References in corpus (20)

• Decoding the phase structure of QCD via particle production at high energy
• (Non)Thermal Aspects of Charmonium Production and a New Look at J/$\psi$ Suppression
• Enhanced J/Psi Production in Deconfined Quark Matter
• Behavior of Charmonium Systems after Deconfinement
• Statistical hadronization of charm in heavy-ion collisions at SPS, RHIC and LHC
• Centrality, rapidity and transverse momentum dependence of $J/\psi$ suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=2.76 TeV
• Model for $J/\psi$ absorption in hadronic matter
• J/psi absorption by pi and rho mesons in a meson exchange model with anomalous parity interactions
• A Model of Charmonium Absorption by Light Mesons
• Charmonium dissociation in hadronic matter
• Quark exchange model for charmonium dissociation in hot hadronic matter
• Open charm and charmonium production at relativistic energies
• Cross Sections for pi- and rho-induced Dissociation of J/psi and psi'
• Open and hidden charm in proton-nucleus and heavy-ion collisions
• J/psi production in relativistic heavy ion collisions from a multi-phase transport model
• Hadronic form factors and the $J/\psi$ secondary production cross section: an update
• Charmonium production from the hadronic phase
• Temperature and fluid velocity on the freeze-out surface from $\pi$, $K$, $p$ spectra in pp, p--Pb and Pb--Pb collisions
• Chemical freeze-out in relativistic heavy-ion collisions
• $J/\psi$ regeneration in a hadron gas: an update