J/psi production at high transverse momentum in p+p and Cu+Cu collisions at \sNN=200GeV

Details J/psi production at high transverse momentum in p+p and Cu+Cu collisions at \sNN=200GeV J/psi production at high transverse momentum in p+p and Cu+Cu collisions at \sNN=200GeV

2009-04-02

arxiv.org/abs/0904.0439v1

Phys.Rev.C80:041902,2009

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevC.80.041902

The STAR collaboration at RHIC presents measurements of \Jpsi$\to{e^+e^-}$ at mid-rapidity and high transverse momentum ($p_T>5$ GeV/$c$) in \pp and central \cucu collisions at \sNN = 200 GeV. The inclusive \Jpsi production cross section for \cucu collisions is found to be consistent at high $p_T$ with the binary collision-scaled cross section for \pp collisions, in contrast to previous measurements at lower $p_T$, where a suppression of \Jpsi production is observed relative to the expectation from binary scaling. Azimuthal correlations of $J/\psi$ with charged hadrons in \pp collisions provide an estimate of the contribution of $B$-meson decays to \Jpsi production of $13% \pm 5%$.

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