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arXiv 0705.4392hep-ph
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包含B介子强子产生的质量效应

Finite-Mass Effects on Inclusive B-Meson Hadroproduction

B. A. Kniehl, G. Kramer, I. Schienbein, H. Spiesberger

摘要:

我们利用非微扰碎裂函数的普适性和标度破坏,对CERN LEP 1和SLAC SLC的e^+e^-数据进行了全局拟合,得到了非微扰碎裂函数,并在一个专用的有限质量方案中计算了次领先阶(NLO)下p_T为中间值的B介子包容性强子产生的横动量(p_T)分布.我们发现,有限质量效应适度地增强了截面,在p_T = 2 m_b时约为20%,并随着p_T的增大而迅速衰减,从而达到零质量预言。我们还执行比较与最近的ppbar数据的CDF合作在运行II在费米实验室Tevatron和评论的有用性的固定风味数计划。

英文摘要:

We calculate the transverse-momentum (p_T) distribution for the inclusive hadroproduction of B mesons at intermediate values of p_T at next-to-leading order (NLO) in a dedicated finite-mass scheme using realistic non-perturbative fragmentation functions that are obtained through a global fit to e^+e^- data from CERN LEP1 and SLAC SLC exploiting their universality and scaling violations. We find that finite-mass effects moderately enhance the cross section, by about 20% at p_T = 2 m_b, and rapidly fade out with increasing value of p_T, so that the zero-mass prediction is reached. We also perform comparisons with recent ppbar data taken by the CDF Collaboration in run II at the Fermilab Tevatron and comment on the usefulness of the fixed-flavor-number scheme.

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