Bottomonium spectroscopy in the quark-gluon plasma

Abstract

The spectroscopic properties of heavy quarkonia are substantially different in the quark-gluon plasma (QGP) that is created in relativistic heavy-ion collisions as compared to the vacuum situation that can be tested in pp collisions at the same center-of-mass energy. In this article, a series of recent works about the dissociation of the Y(nS) and chi_b(nP) states in the hot QGP is summarized. Quarkonia dissociation occurs due to (1) screening of the real quark-antiquark potential, (2) collisional damping through the imaginary part of the potential, and (3) gluon-induced dissociation. In addition, reduced feed-down plays a decisive role for the spin-triplet ground state. Transverse-momentum and centrality-dependent data are well reproduced in Pb-Pb collisions at LHC energies. 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, providing additional evidence for the generation of a quark-gluon droplet.

22 pages, 24 figures; Invited Review for Int. J. Mod. Phys. A

References in corpus (13)

• 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
• Color Screening and Regeneration of Bottomonia in High-Energy Heavy-Ion Collisions
• Suppression of ${\rm Y}$(1S) at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Upsilon Production as a Probe for Early State Dynamics in High Energy Nuclear Collisions at RHIC
• Upsilon suppression in PbPb collisions at the LHC
• Bottomium suppression in PbPb collisions at LHC energies
• Quarkonium formation time in relativistic heavy-ion collisions
• Electromagnetic field effects on ${\rm Y}$-meson dissociation in PbPb collisions at LHC energies
• Temperature dependent formation-time approach for ${\rm Y}$ suppression at energies available at the CERN Large Hadraon Collider
• Limiting fragmentation at LHC energies
• Aspects of relativistic heavy-ion collisions

Cited by in corpus (3)

• Observation of the ${\rm Y}$(3S) meson and suppression of ${\rm Y}$ states in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• In-medium Y(1S,2S,3S) suppression in Pb-Pb collisions at sqrt(s_NN)=5.02 TeV
• Holographic bottomonium formation in a cooling strong-interaction medium at finite baryon density