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arXiv 0711.2830hep-ph
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由QCD求和规则计算重夸克部分子分布函数的矩

Moments of the heavy-quark parton distribution function from QCD sum rules

A. G. Oganesian

摘要:

利用QCD求和规则计算了重赝标介子中重夸克-部分子分布函数的矩。将这些求和规则推广到反重夸克质量中,我们得到了矩的重质量极限。与有限质量结果的比较表明,虽然重质量展开对于$b$夸克相当有效,但对于$c$夸克,必须考虑高于$(1/m_c)^2$阶的项。这一结果可以为基于重夸克质量极限的$c$和$b$夸克碎裂模型提供定量评价。

英文摘要:

The moments of the heavy quark-parton distribution functions in a heavy pseudoscalar meson are calculated from QCD sum rules. Expanding these sum rules in the inverse heavy quark mass we obtain the heavy-mass limits of the moments. Comparison with the finite mass results reveals that while the heavy mass expansion works reasonably well for the $b$ quark, one has to take into account terms of higher than $(1/m_c)^2$ order for the $c$ quark. This result can provide a quantitative assessment of $c$ and $b$ quark fragmentation models based on the heavy-quark mass limit.

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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