arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0902.2393hep-ph
收藏

D(s)+- -> mu+- nu和D(s)+- -> tau+- nu对荷电希格斯玻色子的约束

Constraints on charged Higgs bosons from D(s)+- -> mu+- nu and D(s)+- -> tau+- nu

A. G. Akeroyd, F. Mahmoudi

摘要:

D(s)+-> mu+- nu和D(s)+-> tau+- nu衰变是测量D(s)+介子衰变常数f_D(s)的传统方法。最近在CLEO-c和B工厂的测量表明,这两种衰变的分支比略高于标准模型使用非猝灭晶格计算的f_D(s)的预测。在双希格斯玻色子模型(II型)中,带电的希格斯玻色子(H+-)也会介导这些衰变,但任何来自H+-的相当大的贡献都只能抑制分支比,因此现在稍微不受欢迎。结果表明,这种衰变对参数tan(β)和mH +-的约束可以与轻子介子衰变B+-> tau+- nu_tau和K+-> mu+- nu_mu的类似约束相互竞争和互补,特别是当格点计算最终倾向于fD(s)< 250 MeV时.

英文摘要:

The decays D(s)+- -> mu+- nu and D(s)+- -> tau+- nu have traditionally been used to measure the D(s)+- meson decay constant f_D(s). Recent measurements at CLEO-c and the B factories suggest a branching ratio for both decays somewhat higher than the Standard Model prediction using f_D(s) from unquenched lattice calculations. The charged Higgs boson (H+-) in the Two Higgs Doublet Model (Type II) would also mediate these decays, but any sizeable contribution from H+- can only suppress the branching ratios and consequently is now slightly disfavoured. It is shown that constraints on the parameters tan(beta) and m_H+- from such decays can be competitive with and complementary to analogous constraints derived from the leptonic meson decays B+- -> tau+- nu_tau and K+- -> mu+- nu_mu, especially if lattice calculations eventually prefer f_D(s) < 250 MeV.

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。

↑