Excited charmonium suppression in proton-nucleus collisions as a consequence of comovers

By E. Ferreiro. 2014

138 citations recorded by the source corpus.

Recent results from proton(deuteron)-nucleus collisions at RHIC and LHC energies have shown an unexpected suppression of excited quarkonium states as compared to their ground states. In particular, stronger suppression of the $\psi(2S)$ relative to the $J/\psi$ has been detected. Similar observations were made at lower energies and were easily explained by nuclear absorption. At higher energies, a similar explanation would violate the Heisenberg principle, since the calculations based on the uncertainty principle lead to a charmonium formation time expected to be larger than the nuclear radius, which results in identical nuclear break-up probability for the $\psi(2S)$ and $J/\psi$. On the contrary, this behavior is naturally explained by the interactions of the quarkonium states with a comoving medium. We present our results on $J/\psi$ and $\psi(2S)$ production for d+Au collisions at $\sqrt{s}=200$ GeV and for p+Pb collisions at $\sqrt{s}=5.02$ TeV.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f732a8297e82aa309408d7986817d415e1d75a1c

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In Nuclear and High Energy Physics

Citations in the corpus

J/ψ suppression at forward rapidity in Pb–Pb collisions at √sNN = 5.02 TeV (2016, methodology): “In the co-mover mode l [48, 49], no structure is visible as a function of centrality, and the calculation favours -values slightly below unity, implying that in this model th e increase of the suppression effects with energy may be domin ant over the regeneration effects for all centralities.”
New observables in inclusive production of quarkonia (2019, background): “They can also be broken by comovers [183, 184, 185, 186].”