Influence of Bottom Quark Jet Quenching on Single Electron Tomography of Au+Au
Influence of Bottom Quark Jet Quenching on Single Electron Tomography of Au+Au
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DOI：
10.1016/j.physletb.2005.09.087
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
M. Djordjevic;M. Gyulassy;R. Vogt;S. Wicks
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文献类型：
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作者：
M. Djordjevic;M. Gyulassy;R. Vogt;S. Wicks
在AA碰撞中，高横向动量的单(非光子)电子对底夸克b和魅力c夸克的阻止能力都很敏感。我们用DGLV辐射能量损失理论预测了c和b夸克喷注猝灭，并比较了FONLL和PYTHIA重味道碎裂和衰变方案。结果表明，在S=200AGeV的Au+Au碰撞中，PT=5-10GeV范围内的单电子主要由b夸克的衰变所主导，而不是由更强的c夸克的猝灭所主导。较小的b夸克能量损失，即使对于胶子快度密度高达3500的极端不透明度，预计也将把单电子的核修正因子RAA限制在RAA∼0.50.6的范围内，而不是以前基于只考虑c夸克喷流碎裂的RAA0.20.3的预测。
High transverse momentum single (non-photonic) electrons are shown to be sensitive to the stopping power of both bottom, b, and charm, c, quarks in AA collisions. We apply the DGLV theory of radiative energy loss to predict c and b quark jet quenching and compare the FONLL and PYTHIA heavy flavor fragmentation and decay schemes. We show that single electrons in the pT=5–10GeV range are dominated by the decay of b quarks rather than the more strongly quenched c quarks in Au + Au collisions at s=200AGeV. The smaller b quark energy loss, even for extreme opacities with gluon rapidity densities up to 3500, is predicted to limit the nuclear modification factor, RAA, of single electrons to the range RAA∼0.5–0.6, in contrast to previous predictions of RAA≲0.2–0.3 based on taking only c quark jet fragmentation into account.