Speaker
Yongsun Kim
(Korea University (KR))
Description
A multi-dimensional analysis of charmonia in pp, pA, and AA collisions with the CMS detector will be presented. The prompt J/psi results are obtained using the $L_{int}=5.4 pb^{-1}$ pp, the $L_{int}= 35 nb^{-1}$ pPb, and the $L_{int}=150\mu b^{-1}$ PbPb data recorded between 2011 and 2013. The prompt J/psi nuclear modification factors ($R_{AA}$) and azimuthal anisotropy ($v_2$) in PbPb will be presented, and their impact on the understanding of the charmonium production will be discussed. In addition, the suppression pattern of prompt psi(2S) and J/psi in pp and PbPb collisions will be compared, addressing the phenomenology of the charmonium excited state versus ground state in a medium. The pPb differential cross-sections of prompt J/psi will be shown in a wide kinematic region, for transverse momentum spanning from 2 to 30 GeV /c and a rapidity interval between -2.87 to 1.93 in the center of mass of the collision. The ratio of yields in forward (p-going beam) and backward (Pb-going beam) directions, $R_{FB}$, is measured, to quantify the asymmetry of cross-sections as a function of $p_{T}$, rapidity, and event activity. A significant asymmetry is observed for $2 < p_T < 10$ GeV/c region, with no rapidity dependence, and with the effect monotonically increasing for higher event activity.
| On behalf of collaboration: | CMS |
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Primary author
Yongsun Kim
(Korea University (KR))
