Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-01-06
J.Phys.G36:064051,2009
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 10 figures, SQM08
Scientific paper
10.1088/0954-3899/36/6/064051
In this paper, we present our analysis of mid-rapidity non-photonic electron (NPE) production at pT >0.2GeV/c in p+p collisions at $\sqrt{s_{NN}}$ = 200 GeV. The dataset is about 78M TOF-triggered events taken from RHIC year 2008 runs. Through the measurement of e/\pi ratio, we find that the photonic background electrons from gamma conversions are reduced by about a factor of 10 compared with those in STAR previous runs due to the absence of inner tracking detectors and the supporting materials. The dramatic increase of signal-to-background ratio will allow us to improve the precision on extracting the charm cross-section via its semi-leptonic decays to electrons.
for the STAR Collaboration
Jin Fengping
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