J/Psi production and correlation in p+p and R_{AA} at high-pt in Au+Au collisions

May 24, 2011, 3:40 PM
20m
Salon Ravel AB (Imperial Palace)

Salon Ravel AB

Imperial Palace

Parallel Heavy flavor and quarkonia production Heavy flavors

Speaker

Zebo Tang (University of Science and Technology of China)

Description

The $c\bar{c}$ bound state $J/\psi$ provides a unique tool to probe the properties of the hot dense medium produced in heavy-ion collisions, but to date its production mechanism is not understood clearly either in heavy-ion collisions or in hadron hadron collisions. Measurement of $J/\psi$ production at high $p_T$ is particularly interesting since at high $p_T$ the various models give different predictions. Besides, high $p_T$ particles are widely used to study the parton-medium interactions in heavy-ion collisions. The previous high-$p_T$ $J/\psi$ measurements in $p+p$ and Cu+Cu collisions at RHIC published by the STAR collaboration found several interesting things, though constrained by limited statistics and system size. In this talk, we will present the new measurement of $J/\psi \rightarrow e^+e^-$ production at large $p_T$ range ($0< p_T< 10~\textrm{GeV}/c$) at mid-rapidity ($|y|<1$)in $p+p$ and Au+Au collisions at 200 GeV. The datasets are from RHIC year 2009 $p+p$ and 2010 Au+Au runs with significantly reduced material, the newly installed full TOF, and high data acquisition rates. $J/\psi$ $p_T$ spectra and nuclear modification factors from low to high $p_T$ will be discussed to understand its production mechanism and medium modifications. The $J/\psi$-hadron azimuthal angle correlation in $p+p$ collisions will be presented to disentangle $B$-mesons contributions to inclusive $J/\psi$ and study J/$\psi$ hadronization mechanism.

Primary author

Zebo Tang (University of Science and Technology of China)

Presentation materials