November 24th
when: Tuesday 24/11/2020, 12:45
where: KE D201 and Zoom meeting!
speaker: Juhee Hong
Title: Quarkonium suppression by dissociation and energy loss
abstract:
Quarkonium is an important probe of the quark-gluon plasma (QGP) produced in relativistic heavy-ion
collisions. Recently, it has been found that the heavy quark-antiquark static potential develops an imaginary part
that results in the thermal width of quarkonium. In this talk, we will discuss the thermal width using an effective
vertex derived from the Bethe-Salpeter amplitude, and show that the next-to-leading order dissociation cross section
agrees with the result by potential nonrelativistic QCD (pNRQCD). By solving the Boltzmann equation with the
temperature-dependent thermal width and regeneration term, we investigate the medium modification of the
transverse momentum spectra of the Y(1S). In our approach, the almost momentum-independent CMS data of
the R_{PbPb} can be described by the interplay between the suppression by dissociation and enhancement by
regeneration. Finally, the quarkonium energy loss will be considered based on the quarkonium-gluon effective vertex.
The energy loss effects on the Y(1S) R_{pPb} are found to be comparable with the recent CMS data assuming
quarkonium traverses a static medium with an effective temperature T~300MeV, which can be interpreted as
an average effect coming from the gluons inside the nucleons.