Abstract
The modification of bottomonia yields in Pb–Pb and p–Pb collisions at LHC energies with respect to the expectation from p–p is investigated in a theoretical approach. Dissociation of the ϒ(nS) and ϒ(nP) states in the hot quark-gluon plasma (QGP) occurs due to screening of the real quark-antiquark potential, collisional damping through the imaginary part of the potential, and gluon-induced dissociation. Reduced feed-down plays a decisive role. Transverse-momentum and centrality-dependent data are well re- produced. In the asymmetric p-Pb system, alterations of the parton density functions in the lead nucleus account for the leading fraction of the modifications in cold nuclear matter (CNM), but the hot-medium effects turn out to be relevant in spite of the small initial spatial extent of the fireball.
Highlights
Heavy mesons such as J/ψ or Υ provide sensitive probes for the properties of the quark-gluon plasma (QGP) that is generated in relativistic heavy-ion collisions
The AuAu data [4] show more suppression of the Υ(1S) state compared to our hot-medium model, indicating that cold nuclear matter (CNM) The effects are relatively more asymmetric pPb system at p√rosnNoNu=nc8e.d16asTecVomhpaasrbeedetnoinPvbePsbtigatatLeHd Ctheeonreertgicieasl.ly in great detail with respect to CNM effects in Ref. [7]
For bottomonia iTnhaesypmremdiecttriiocncsohlloiwsiosnless, spsPubpaptre√sssiNoNn than the data in peripheral collisions. = 8.16 TeV has been investigated experimentally by the LHCb [15] and ALICE [16] collaborations, and cold nuclear matter predictions had been published by a group of theorists [7]
Summary
Heavy mesons such as J/ψ or Υ provide sensitive probes for the properties of the quark-gluon plasma (QGP) that is generated in relativistic heavy-ion collisions. They are produced in hard collisions at short formation times, typically at τF = 0.3 − 0.6 fm/c. Υ(1S)-state is found to be suppressed down to about 38% as compared to the expectation from scaled pp collisions at the same energy. The AuAu data [4] show more suppression of the Υ(1S) state compared to our hot-medium model, indicating that cold nuclear matter (CNM) The effects are relatively more asymmetric pPb system at p√rosnNoNu=nc8e.d16asTecVomhpaasrbeedetnoinPvbePsbtigatatLeHd Ctheeonreertgicieasl.ly in great detail
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