Conveners
Parallel Session V: Quarkonia Production (II)
- Ramona Vogt (University of California at Davis)
ALICE (A Large Ion Collider Experiment) is devoted to the study of heavy-ion collisions at LHC energies. It is predicted that a deconfined state of nuclear matter, the Quark-Gluon Plasma (QGP), is created in such collisions. The production of heavy quarkonia is modified in the presence of a QGP compared to the production in pp and p--Pb collisions. In particular, a suppression by colour...
Quark-Gluon Plasma (QGP), a new state of matter where quarks and gluons are de-confined, is believed to have existed up to a few milliseconds after the Big Bang. Quarkonia could dissociate in the QGP due to color screening of quark-antiquark potential by the surrounding partons in the medium, which was suggested as a signature of QGP formation in heavy-ion collisions. Moreover, different...
We present the first application of the Comover Interaction Model (CIM) to $\Upsilon(nS)$ production in nucleus-nucleus and proton-nucleus collisions from fixed-target to collider energies. The CIM offers an elegant way to explain the relative suppression of the excited $\Upsilon$ states observed in proton-nucleus collisions at the LHC. From these relative suppressions, we are able to...
Bottomonia are important probes of the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. The production cross sections of the three Y states (1S, 2S, 3S) were measured by CMS in pp and PbPb collisions at 2.76 TeV. A strong suppression is observed in PbPb collisions, by up to a factor of 2 and 10 for the Y(1S) and Y(2S)...
