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arXiv 0708.0855hep-ph
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在一个环上对B -> X_c l nu的动力学修正

Kinetic corrections to B -> X_c l nu at one loop

Thomas Becher, Heike Boos, Enrico Lunghi

摘要:

本文计算了在微分B -> X_c l nu衰变率的算子乘积展开中对动力学算符Wilson系数的单圈修正。随着轻子能量的适度削减,单圈项将动力学算符对谱矩的贡献改变约20%。这相当于对轻子矩和强子矩的一个小的修正,除了那些在最低阶消失的矩,在那里效果是相当大的。再加上两圈计算的领先功率率和评价的单圈修正的色磁算子的威尔逊系数,我们的结果将允许高精度的测定|V_cb|和b-和c-夸克质量。

英文摘要:

We evaluate the one-loop corrections to the Wilson coefficient of the kinetic operator in the operator product expansion of the differential B -> X_c l nu decay rate. With a moderate cut on the lepton energy, the one-loop terms change the kinetic operator contributions to spectral moments by about 20%. This amounts to a small correction for leptonic and hadronic moments, except for those which vanish at the lowest order, where the effect can be sizable. Together with a two-loop calculation of the leading-power rate and an evaluation of the one-loop corrections to the Wilson coefficient of the chromo-magnetic operator, our results will allow for a high-precision determination of |V_cb| and the b- and c-quark masses.

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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