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تسجيل مستخدم جديدRecent Heavy-Flavor results at STAR
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Zhangbu Xu
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We present the recent results on non-photonic electron (NPE) yields from RHIC run8 p+p collisions. The $e/pi$ ratio as a function of $p_T$ in run8 with a factor of 10 reduction of the inner detector material at STAR is found to be consistent with those results from run3 taking into account the NPE from charm leptonic decay and the difference of photonic electron yield from photon conversion in detector material. Jpsi spectra in pp and cucu collisions at sNN = 200 GeV with high sampled luminosity Jpsi spectrum at high-pT follows $x_T$ scaling, but the scaling is violated at low pT. $J/psi$-hadron correlations in pp collisions are studied to understand the Jpsi production mechanism at high $p_T$. We observed an absence of charged hadrons accompanying Jpsi on the near-side, in contrast to the strong correlation peak in the di-hadron correlations. This constrains the $B$-meson contribution and jet fragmentation to inclusive Jpsi to be ${}^{<}_{sim}17%$. Yields in minimum-bias cucu collisions are consistent with those in pp collisions scaled by the underlying binary nucleon-nucleon collisions in the measured pT range. Other measurements and future projects related to heavy-flavors are discussed.
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