On the D*s and charmonia leptonic decays

G. Bailas, B. Blossier, J. Heitger, V. Mor'enas, Matthias Post
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Abstract

Among the different scenarios of New Physics, those with an extended Higgs sector are examined with a lot of attention. Recent experimental observations of several anomalies in flavour physics with respect to expectations of the Standard Model further motivate the effort of phenomenologists. First, informations about the R D s ratio, a test of lepton flavour universality equivalent to R D , already measured, but with the s quark as spectator, are awaited in coming years to constrain the corner of an extended Higgs sector with charged doublets. On another side, leptonic widths of pseudoscalar quarkonia are particularly interesting to test an extended Higgs sector with a light CP-odd Higgs boson singlet, through the study of its mixing with quarkonia states. Hadronic parameters entering those processes have to be determined from lattice QCD with enough confidence on the control of systematic errors. We report on the very first step of a long-term program tackled with N f = 2 Wilson-Clover fermions to put relevant constraints on extensions of the Higgs sector: extraction of decay constants of D * s , ƞ c , ƞ c (2 S ), J / Ψ and Ψ (2 S ) with lattice ensembles provided by the CLS effort, considering 2 lattice spacings and a large range of pion masses to estimate cut-off effects and extrapolate results to the chiral limit.
关于D*s和调和子的轻子衰变
在新物理学的不同场景中,那些具有扩展希格斯扇区的场景受到了大量关注。最近对风味物理中几种异常现象的实验观察与标准模型的期望进一步激发了现象学家的努力。首先,关于R - D - s比的信息,一种与R - D等价的轻子味普适性的测试,已经测量出来了,但有s夸克作为旁观者,在未来几年等待着用带电双重态约束扩展希格斯扇区的角落。另一方面,通过研究其与夸克态的混合,伪标量夸克的轻子宽度对于用一个轻的cp奇数希格斯玻色子单重态来测试一个扩展的希格斯扇区是特别有趣的。进入这些过程的强子参数必须在系统误差控制上有足够的置信度,并从晶格QCD中确定。我们报道了一个长期计划的第一步解决与N f = 2 Wilson-Clover费米子把希格斯粒子的相关约束扩展部门:提取衰变常数D * s,ƞc,ƞc (2 s), J /Ψ和Ψ(2 s)与晶格乐团提供的CLS努力,考虑2晶格间距和大范围的介子质量估计截止效果和推断结果手性限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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