Sequential regeneration of charmonia in heavy-ion collisions

By Xiaojian Du, R. Rapp. 2015

180 citations recorded by the source corpus.

Abstract We investigate the production of ψ ( 2 S ) in nuclear collisions at RHIC and LHC energies. We first address charmonium production in 200 GeV d–Au collisions at RHIC; the strong suppression of ψ ′ mesons observed in these reactions indicates mechanisms beyond initial cold nuclear matter effects. We find that a more complete treatment of hadronic dissociation reactions leads to appreciable ψ ′ suppression in the thermal medium of an expanding fireball background for d–Au collisions. When implementing updated hadronic reaction rates into a fireball for 2.76 TeV Pb–Pb collisions at LHC, the regeneration of ψ ′ mesons occurs significantly later than for J / ψ 's. Despite a smaller total number of regenerated ψ ′ , the stronger radial flow at their time of production induces a marked enhancement of their R AA relative to J / ψ 's in a transverse-momentum range of p t ≃ 3 – 6  GeV . We explore the consequences and uncertainties of this “sequential regeneration” mechanism on the R AA double ratio and find that it can reproduce the trends observed in recent CMS data.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/238de588133e05ec3e511a07c2e50dfc6fae9d4f

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In Nuclear and High Energy Physics

1. P. Braun-Munzinger
2. J. Stachel
3. R. Rapp
4. Alexander Rothkopf
5. A. Andronic
6. J. Lansberg
7. F. Arleo
8. S. Peigné

Citations in the corpus

• Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions (2015, background): “when a stronger radial flow is present [759].”
• J/ψ suppression at forward rapidity in Pb–Pb collisions at √sNN = 5.02 TeV (2016, background): “[18,54,55] (TM1) shows a decrease of r with increasing centrality, due to the larger suppression effects at high energy, followed by an increase, related to the effect of regeneration, which acts in the opposite direction and becomes dominant for central collisions.”