Non-photonic electron-hadron correlations and non-photonic electron nu(2) at STAR/RHIC

作者：Wang Gang^*

来源：Nuclear Physics A, 2011, 855(1): 319-322.

DOI：10.1016/j.nuclphysa.2011.02.069

• RHIC
• Heavy flavor
• Non-photonic electron
• Correlation
• Elliptic flow

Non-photonic electrons (PT > 3 GeV/c) represent the directions of the parent heavy quarks, and their angular correlations with charged hadrons provide a good tool to study the relative contributions from D and B meson decays in pip collisions, as well as the flavor-dependence of the energy loss mechanism in A+A collisions. We review the disentanglement of charm and bottom contributions to non-photonic electrons in p+p collisions at root s = 200 GeV at RHIC. B decay contribution is approximately 50% at the electron transverse momentum of p(T) > 5 GeV/c from STAR results. Incorporating the energy loss (R-AA) information of non-photonic electrons, the result indicates a B meson suppression at high p(T) in heavy ion collisions. We also present non-photonic electron-hadron correlations in d+Au collisions as a baseline reference for the investigation of the heavy quark energy loss in A+A collisions. The interactions between heavy quarks and the QCD medium can lead to a non-zero "elliptic flow" parameter (nu(2)) of D and B mesons which can be studied through nu(2) of non-photonic electrons. Preliminary nu(2) measurements for non-photonic electrons are shown to be lower than nu(2) of charged hadrons (or K-s(0), Lambda) for 200 GeV Au+Au collisions.

• 出版日期2011-4-1