Charmonia in pp, pPb and PbPb with CMS

20 May 2014, 09:00
platinum (darmstadtium)



Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Open Heavy Flavour and Quarkonia Heavy flavor


Dong Ho Moon (University of Illinois at Chicago (US))


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))

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