Speaker
Dong Ho Moon
(University of Illinois at Chicago (US))
Description
The mechanisms through which charmonia production is modified in the high-density medium created
in ultra-relativistic heavy-ion collisions, are still not quantitatively understood. In order to
disentangle among different scenarios, a multi-dimensional analysis in a wide kinematic range is
needed, in pp, pA and AA collisions, looking at many observables that have different
sensitivities to the various aspects of charmonia production. We will report on the prompt
$J/\psi$ measurements with the CMS detector, using the 35 nb$^{-1}$ pPb data recorded in 2013
and the 150 $\mu$b$^{-1}$ of PbPb data recorded in 2011. The nuclear modification factors and
azimuthal anisotropy in PbPb collisions at 2.76 TeV will be presented. New measurements of the
forward to backward ratios in pPb collisions at 5.02 TeV will also be shown. The dependence of
all these observables on the prompt $J/\psi$ kinematics, as well as the event characteristics,
will be shown. In addition, the comparison of the excited charmonium state ($\psi(2S)$) and the
ground state ($J/\psi$) between PbPb and pp is updated, utilizing the pp sample from 2013, which
has a factor of 20 higher statistical precision than the 2011 pp data previously presented.
| On behalf of collaboration: | CMS |
|---|
Primary author
Dong Ho Moon
(University of Illinois at Chicago (US))
