Speaker
Saeahram Yoo
(University of California Davis (US))
Description
We present a measurement of $\Upsilon$ polarization in PbPb collisions with the CMS detector. The results are obtained in the helicity and Collins-Soper frames and compared with the corresponding measurements in pp collisions. Until now, all studies of quarkonium suppression in heavy ion collisions have assumed unpolarized production in the computation of the detection acceptance. The observed suppression patterns could be caused (to a large extent) by variations in quarkonium polarization rather than by a genuine medium-induced modification of the production yields. Polarization measurements represent an important step in establishing a comprehensive picture of the production and suppression of quarkonia in a hot QCD medium.
Authors
Florian Damas
(LLR - Centre National de la Recherche Scientifique (FR))
Jaebeom Park
(Korea University (KR))
Manuel Calderon De La Barca Sanchez
(University of California Davis (US))
Saeahram Yoo
(University of California Davis (US))
