J/ψ production at high pT in p+p and Cu+Cu collisions at STAR
J/ψ production at high pT in p+p and Cu+Cu collisions at STAR
复制标题
DOI：
10.1016/j.nuclphysa.2009.12.060
复制
发表时间：
2010-03
期刊：
影响因子：
--
通讯作者：
Zebo Tang
中科院分区：
文献类型：
--
作者：
Zebo Tang
本文给出了在星星装置上，在sq root（s{sub NN}）= 200 GeV，横动量分别为5-14 GeV/c和5-8 GeV/c的p+p和Cu+Cu碰撞中J/psi谱的测量结果.产量在最小偏置Cu+Cu碰撞在高p{sub T}被发现是一致的二元碰撞标度的横截面在p+p碰撞，在较低的p{sub T}，与以前的测量。在RHIC上首次测量了J/psi与带电强子的方位角关联，估计出在sqroot（s）= 200 GeV的p+p碰撞中，当p{sub T}>5GeV/c时，B强子衰变对J/psi产生的贡献为13% ± 5%。
The results on J/psi spectra in p+p and Cu+Cu collisions at sq root(s{sub NN})=200GeV at STAR with transverse momenta in the range of 5-14 GeV/c and 5-8 GeV/c, respectively, are presented. Yields in minimum-bias Cu+Cu collisions at high p{sub T} are found to be consistent with the binary collision-scaled cross section in p+p collisions, in contrast to previous measurements at lower p{sub T}. The first measurement of azimuthal correlations of J/psi with charged hadrons at RHIC provides an estimate of the contribution of B-hadron decays to J/psi production of 13%+-5% at p{sub T}>5GeV/c in p+p collisions at sq root(s)=200GeV.