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arXiv 0807.0202hep-phhep-lat
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B_q到D_q跃迁标量形状因子的手征修正

Chiral corrections to the scalar form factor in B_q to D_q transitions

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

摘要:

本文研究了B_q到D_q的lnu衰变中标量形状因子的手征环修正。首先考虑对1/m_Q抑制算符的手征修正,然后提出利用格点量子色动力学结果提取相关形状因子的方法。在B_s到D_s的lnu衰变中,我们发现运动学和手征修正的影响趋于抵消标量形状因子的贡献。特别地,手征修正的1/m_Q抑制可以被SU(3)味对称性破缺修正补偿,其补偿量可以达到30%。计算的修正值对于精确确定B_q到D_qlnu衰变中可能出现的新物理效应是有意义的。

英文摘要:

We consider chiral loop corrections to the scalar form factor in B_q to D_q l nu decays. First we consider chiral corrections to the 1/m_Q suppressed operators and then we propose the procedure for the extraction of the relevant form factor using lattice QCD results. In the case of B_s to D_s l nu decay we find that effects of kinematics and chiral corrections tend to cancel for the scalar form factor contributions. In particular the 1/m_Q suppression of chiral corrections is compensated by the SU(3) flavor symmetry breaking corrections which can be as large as 30%. The calculated corrections are relevant for the precise determination of possible new physics effects in B_q to D_q l nu decays.

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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