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arXiv 0810.0461hep-ph
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B到D lnu衰变的手征环修正

Chiral loop corrections in B to D l nu decays

Jan O. Eeg, Svjetlana Fajfer, Jernej F. Kamenik

摘要:

在结合重夸克和手征对称性的框架内,我们确定了手征环对B介子衰变振幅到正宇称粲介子和负宇称粲介子的修正。我们发现,由于相反的宇称状态的修正是竞争的贡献所产生的K和η介子环。由于晶格研究依赖于振幅的手征行为,我们讨论了我们的结果的手征极限。我们还评论了1/m_B,1/m_D次引导形状因子的提取,这些因子与研究B_q到D_q τ nu衰变有关,它们对可能的螺旋抑制的新物理贡献很敏感。

英文摘要:

We determine chiral loop corrections to the B meson decay amplitudes to positive and negative parity charmed mesons within a framework which combines heavy quark and chiral symmetries. We find that corrections due to states of opposite parity are competitive with the contributions arising from K and eta meson loops. Since lattice studies rely on the chiral behavior of the amplitudes we discuss the chiral limit of our results. We also comment on the extraction of 1/m_B, 1/m_D subleading form factors relevant for the studies of B_q to D_q tau nu decays, which are sensitive to possible helicity-suppressed new physics contributions.

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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