engleski

J/$\psi$ production at high transverse momenta in p+p and Au+Au collisions at sqrt(s_{; ; NN}; ; ) = 200 GeV

We report J/ψ spectra for transverse momenta pT> 5 GeV/c at mid- rapidity in p+p and Au+Au collisions at sqrt(s_{; ; NN}; ; ) = 200 GeV.The inclusive J/ψ spectrum and the extracted B-hadron feed-down are compared to models incorporating different production mechanisms. We observe significant suppression of the J/ψ yields for pT> 5 GeV/c in 0-30% Au+Au collisions relative to the p+p yield scaled by the number of binary nucleon-nucleon collisions in Au+Au collisions. In 30-60% collisions, no such suppression is observed.The level of suppression is consistently less than that of high-pT π± and low-pT J/ψ.

STAR; J/Psi; transverse; 200GeV

nije evidentirano