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arXiv 1102.2611nucl-ex
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在$\sqrt{s}$ = 200 GeV的PDMATHAAB + PDMATHAAB碰撞中的高$p_{T}$非光子电子产生

High $p_{T}$ non-photonic electron production in $p$+$p$ collisions at $\sqrt{s}$ = 200 GeV

STAR Collaboration, H. Agakishiev

摘要:

利用2005年和2008年在相对论重离子对撞机(RHIC)上进行的STAR实验记录的数据,测量了能量为$\sqrt{s}$ = 200 GeV的$p$ + $p$碰撞中高横动量($p_T > $ 2.5 GeV/ $c$)非光子电子的产生.尽管由于不同的探测器配置,光子背景能级存在很大差异,但两次运行的测量截面彼此一致。我们比较了测量的非光子电子截面与以前发表的RHIC数据和pQCD计算。利用B介子和D介子对非光子电子的相对贡献,我们确定了在3GeV/ $c < p_T <~$ ~ 10 GeV/ $c$处的电子积分截面($\frac{e^++e^-}{2}$)和粲介子衰变截面为${dσ_{(B\to e)+(B\to D \to e)} \over dy_e}|_{y_e=0}$ = 4.0PDMATHABMT({ \rm stat}). $\pm1.1$({ \rm syst.})nb和${dσ_{D\to e} \over dy_e}|_{y_e=0}$ = 6.2 $\pm0.7$({ \rm stat.})$\pm1.5$({ \rm syst.})NB分别。

英文摘要:

We present the measurement of non-photonic electron production at high transverse momentum ($p_T > $ 2.5 GeV/$c$) in $p$ + $p$ collisions at $\sqrt{s}$ = 200 GeV using data recorded during 2005 and 2008 by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The measured cross-sections from the two runs are consistent with each other despite a large difference in photonic background levels due to different detector configurations. We compare the measured non-photonic electron cross-sections with previously published RHIC data and pQCD calculations. Using the relative contributions of B and D mesons to non-photonic electrons, we determine the integrated cross sections of electrons ($\frac{e^++e^-}{2}$) at 3 GeV/$c < p_T <~$10 GeV/$c$ from bottom and charm meson decays to be ${dσ_{(B\to e)+(B\to D \to e)} \over dy_e}|_{y_e=0}$ = 4.0$\pm0.5$({\rm stat.})$\pm1.1$({\rm syst.}) nb and ${dσ_{D\to e} \over dy_e}|_{y_e=0}$ = 6.2$\pm0.7$({\rm stat.})$\pm1.5$({\rm syst.}) nb, respectively.

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