STAR Measurements of Bottom to Charm Ratio and Heavy Quark Interaction with the QCD Medium through Non-Photonic Electron-Hadron Correlations

We present STAR measurements of relative charm and bottom contributions to NPE from $p+p$ collisions at $\sqrt{s}$= 200 and 500 GeV energies. We report the total bottom quark production cross section from p+p collisions at $\sqrt{s}= 200$ GeV extracted from NPE spectrum and B to D ratios. We also present the NPE-hadron azimuthal correlations from $Au+Au$ collisions at $\sqrtsNN = 200$ GeV from the 2010 RHIC run where we have collected high statistics data set with low photonic conversion background.
Comment: 4 pages, 3 figures. Proceedings for XXII International Conference on Ultra-relativistic Nucleus-Nucleus Collision (Quark Matter 2011), 22 - 28 May 2011, Annecy, France