$J/\psi$ regeneration in a hadron gas: an update

Abstract

In heavy ion collisions after the quark-gluon plasma there is a hadronic gas phase. Using effective Lagrangians we study the interactions of charmed mesons which lead to $J/\psi$ production and absorption in this gas. We update and extend previous calculations introducing strange meson interactions and also including the interactions mediated by the recently measured exotic charmonium resonances $Z(3900)$ and $Z(4025)$. These resonances open new reaction channels for the $J/\psi$, which could potentially lead to changes in its multiplicity. We compute the $J/\psi$ production cross section in processes such as $D_{(s)}^{(\ast )}+{\bar{D}}^{(\ast )}\to J/\psi +(\pi ,\rho ,K,K^{\ast })$ and also the $J/\psi$ absorption cross section in the corresponding inverse processes. Using the obtained cross sections as input to solve the rate equation, we conclude that the interactions in the hadron gas phase do not significantly affect the $J/\Psi$ abundance. In other words, there is neither a charmonium suppression nor charmonium regeneration from light mesons in the hadronic phase.

Corrections in the text and in the references, 14 pages 6 figures

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Cited by in corpus (17)

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• Pseudoscalar and vector open-charm mesons at finite temperature
• Interactions of the doubly charmed state $T_{cc}^{+}$ with a hadronic medium
• $X_J(2900)$ states in a hot hadronic medium
• ${\rm Y}$ suppression in a hadron gas
• On the two-body decay processes of the predicted three-body $K^{\ast }(4307)$ resonance
• Hadronic medium effects on $Z_{cs}(3985{)}^{-}$ production in heavy-ion collisions
• Interactions of the ${\chi }_{c1}(4274)$ state with light mesons
• Impact of unitarization on the $J/\psi$-light meson cross section
• Heavy-meson chiral Lagrangians, effective flavored couplings, SU(4) flavor breaking and their consequences
• Interaction of exotic states in a hadronic medium: the $Z_c(3900)$ case
• Quarkonium interactions with (hot) hadronic matter
• Hadronic $J/\psi$ Regeneration in Pb+Pb Collisions
• Interactions of the deuteron with a hadronic medium
• Production of the $X(3872)$ state via the $B^0\to K^{\ast 0}X(3872)$ decay
• Dissociation Cross Sections of Large-Momentum Charmonia with Light Mesons in Hadronic Matter