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arXiv 0704.2999hep-phhep-ex
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Tevatron和LHC重夸克喷流的精确QCD预言

Accurate QCD predictions for heavy-quark jets at the Tevatron and LHC

Andrea Banfi, Gavin P. Salam, Giulia Zanderighi

摘要:

重夸克喷流在今天的许多对撞机研究和搜索中很重要,但对它们的预测比对轻喷流的预测具有更大的不确定性。这是因为在高阶中来自大的双曲正切ln(p_t/m_Q)的强增强。本文提出了一个新的重夸克喷注定义,它不含所有阶的末态分布,使得所有的初态共线分布都可以归算到重夸克部分子分布中。重喷流谱可以在无质量近似下计算,这比有质量的计算更简单,并将理论的不确定性降低了三倍。这提供了有史以来第一次准确的预测包容性的b-和c-喷气机,后者有显着的歧视权力的固有魅力的质子内容。这里介绍的技术可以用来获得重味射流的结果,从现有的无质量的下一个领先的顺序计算范围广泛的过程。我们还讨论了我们的风味射流定义的实验适用性。

英文摘要:

Heavy-quark jets are important in many of today's collider studies and searches, yet predictions for them are subject to much larger uncertainties than for light jets. This is because of strong enhancements in higher orders from large logarithms, ln(p_t/m_Q). We propose a new definition of heavy-quark jets, which is free of final-state logarithms to all orders and such that all initial-state collinear logarithms can be resummed into the heavy-quark parton distributions. Heavy-jet spectra can then be calculated in the massless approximation, which is simpler than a massive calculation and reduces the theoretical uncertainties by a factor of three. This provides the first ever accurate predictions for inclusive b- and c-jets, and the latter have significant discriminatory power for the intrinsic charm content of the proton. The techniques introduced here could be used to obtain heavy-flavour jet results from existing massless next-to-leading order calculations for a wide range of processes. We also discuss the experimental applicability of our flavoured jet definition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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