SU(3) Breaking Corrections to the $D$, $D^*$, $B$, and $B^*$ decay Constants

SU(3) Breaking Corrections to the $D$, $D^*$, $B$, and $B^*$ decay Constants
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DOI:
10.1016/j.physletb.2012.06.025
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发表时间:
2011-09
期刊:
影响因子:
4.4
通讯作者:
M. Altenbuchinger;L. Geng;L. Geng;W. Weise
M. Altenbuchinger;L. Geng;L. Geng;W. Weise
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Altenbuchinger;L. Geng;L. Geng;W. Weise

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利用手征微扰理论的协变公式,我们报道了D(D_n)和B(B_n)介子衰变常数的一阶次-首阶计算.结果表明,使用最先进的格点QCD结果[公式:见正文]作为输入,可以定量地预测[公式:见正文],[公式:见正文]和[公式:见正文]的比率,考虑到重夸克自旋味道对称性破缺对相关低能常数的影响。这些比值[公式:见正文]和[公式:见正文]之间的预测关系,以及它们对轻夸克质量的依赖性,应该可以在未来的格点QCD模拟中得到检验,这将为我们理解重夸克的自旋-味道对称性、手征对称性及其破缺模式提供一个严格的检验。
We report on a first next-to-next-to-leading order calculation of the decay constants of the D (D⁎) and B (B⁎) mesons using a covariant formulation of chiral perturbation theory. It is shown that, using the state-of-the-art lattice QCD results on [Formula: see text] as input, one can predict quantitatively the ratios of [Formula: see text] , [Formula: see text] , and [Formula: see text] taking into account heavy-quark spin-flavor symmetry breaking effects on the relevant low-energy constants. The predicted relations between these ratios, [Formula: see text] and [Formula: see text] , and their light-quark mass dependence should be testable in future lattice QCD simulations, providing a stringent test of our understanding of heavy quark spin-flavor symmetry, chiral symmetry and their breaking patterns.