Upsilon suppression in PbPb collisions at the LHC

Abstract

We suggest that the combined effect of screening, gluon-induced dissociation, collisional damping, and reduced feed-down explains most of the sequential suppression of Upsilon(nS) states that has been observed in PbPb relative to pp collisions at sqrt(s_NN) = 2.76 TeV. The suppression is thus a clear, albeit indirect, indication for the presence of a QGP. The Upsilon(1S) ground state suppression is essentially due to reduced feed-down, collisional damping and gluodissociation, whereas screening prevails for the suppression of the excited states.

8 pages, 8 figures; Text and Refs. updated; accepted by Phys. Rev. C

References in corpus (4)

• Static quark-antiquark pairs at finite temperature
• Observation of sequential Upsilon suppression in PbPb collisions
• Real and imaginary-time $Q\bar{Q}$ correlators in a thermal medium
• Theoretical issues in J/psi suppression