Conveners
Quarkonia IV
- Blaizot Jean-Paul (CEA (FR))
Dr
Rongrong Ma
(Brookhaven National Laboratory)
30/09/2015, 10:50
Quarkonia
Contributed talk
Measurements of quarkonium production in heavy-ion collisions have played an essential role in understanding the properties of the Quark Gluon Plasma (QGP) created in such collisions. In particular, $J/\psi$ suppression in the medium has been proposed as a direct probe of the QGP formation, where quarks and gluons are the relevant degrees of freedom. However, regeneration of $J/\psi$ from...
Gines Martinez-Garcia
(Centre National de la Recherche Scientifique (FR))
30/09/2015, 11:10
Quarkonia
Contributed talk
We report on the first measurement of an excess in the yield of J/psi at
very low transverse momentum with respect to expectations from hadronic
production, performed by ALICE at the LHC in Pb-Pb collisions at 2.76 TeV.
Remarkably, the measured nuclear modification factor of J/$\psi$ in the
rapidity range 2.5<$y$<4.0 reaches about 7 (2) for Pb-Pb collisions in
the $p_\mathrm{T}$ range...
Mihee Jo
(Centre National de la Recherche Scientifique (FR))
30/09/2015, 11:30
Quarkonia
Contributed talk
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 section of the three Y states (1S, 2S, 3S) was measured separately using the Compact Muon Solenoid (CMS) experimental apparatus, in pp and PbPb collisions at 2.76 TeV. A strong suppression is observed in PbPb collisions,...
Georg Wolschin
(Heidelberg University)
30/09/2015, 11:50
Quarkonia
Contributed talk
Heavy quarkonia and in particular, the Upsilon meson as observed
by CMS [1] and ALICE [2] have proven to be a very useful tool to investigate the quark-gluon plasma that is likely created in heavy-ion collisions at RHIC and LHC energies.
Here it is suggested that the combined effect of gluon-induced dissociation, collisional damping, screening, and reduced feed-down explains [3,4] most of...
Pol Gossiaux
(Subatech)
30/09/2015, 12:10
Quarkonia
Contributed talk
The suppression of upsilon Y(1S) states in AA collisions, observed by the STAR collaboration at RHIC and by the CMS and ALICE collaboration at LHC, is one of the most convincing evidence for the creation of the quark gluon plasma. The precise survival of excited Y(2S) and Y(3S) states vs ground state could even allow to measure the highest temperature reached in those collisions, according for...
