QCD+QED晶格计算强子衰变速率

D. Giusti
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引用次数: 1

摘要

同位旋是强相互作用的一种几乎精确的对称,对等对称极限的修正通常在百分比水平上。对于与味物理现象学相关的几个强子量,如伪标量介子质量或介子轻子和半介子衰变率,这些影响与当前在晶格上的大规模QCD模拟中引用的不确定性具有相同的数量级,不能再被忽视了。在这篇文章中,我讨论了由Soton- RM123合作获得的光伪标量介子的轻子衰变率的一些最新结果,包括第一性原理晶格模拟中的首阶电磁和强同位旋破缺修正。所采用的策略是在目前晶格技术的范围内,它允许确定物理观测的电磁修正,在计算的中间步骤中发生红外发散的微妙抵消。目前正在将所开发的方法应用于研究重-轻介子和半光子衰变率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
QCD+QED lattice calculation of hadronic decay rates
Isospin is an almost exact symmetry of strong interactions and the corrections to the isosymmetric limit are, in general, at the percent level. For several hadronic quantities relevant for flavour physics phenomenology, such as pseudoscalar meson masses or the kaon leptonic and semileptonic decay rates, these effects are of the same order of magnitude of the uncertainties quoted in current large-scale QCD simulations on the lattice and cannot be neglected anymore. In this contribution I discuss some recent results for the leptonic decay rates of light pseudoscalar mesons obtained by the Soton--RM123 Collaboration including the leading-order electromagnetic and strong isospin-breaking corrections in first principles lattice simulations. The adopted strategy is within the reach of present lattice technologies and it allows to determine electromagnetic corrections to physical observables for which delicate cancellations of infrared divergences occur in the intermediate steps of the calculation. The application of the developed method to the study of heavy-light meson and semileptonic decay rates is currently underway.
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