论文标题
z介导的fcnc在半衰减衰减中的含义$ b_s \ toϕl^+ l^ - $和$ b^+ \ to k^+ l^+ l^ - $
Implication of Z-mediated FCNC on semileptonic decays $B_s\toϕl^+l^-$ and $B^+\to K^+ l^+ l^-$
论文作者
论文摘要
稀有的B梅森腐烂是由风味变化的中性电流（FCNC）过渡介导的有趣作用，可以探测标准模型（SM）的风味部门。通常，在树级上，SM中不允许FCNC过程，而是在循环级别发生。这为新物理学（NP）提供了绝佳的狩猎场。从各种实验研究中可以发现，具有夸克级过渡$ b \ to s $的FCNC过程具有挑战性。在这里，我们研究了不同的动力学可观察物，例如前向后不对称，差异分支率和半甲基繁殖的稀有B衰减模式的差异分支率和Lepton极化不对称，$ b_s \ to ϕl^+ l^ - $ l^ - $ and $ b^+ \与K^+ l^+ l^+ l^+ l^+ l^ - $（$ L^ - $ L^ - $ L^ - $ l^=μ，考虑Z-c的贡献。由于非宇宙$ z $ -BS $耦合，发现这些衰减频道的可观察到这些衰减频道的明显偏差。
Rare B meson decays mediated by flavour changing neutral current (FCNC) transition play interesting role to probe the flavour sector of the standard model (SM). Generally at the tree level, FCNC processes are not allowed in the SM but occurs at the loop levels. This gives an excellent hunting ground for new physics (NP). From various experimental studies it is found that the FCNC processes having quark level transition $b \to s$ are challenging. Here, we investigate different kinematic observables like forward-backward asymmetry, differential branching ratio and lepton polarization asymmetry for semileptonic rare B decay modes $B_s \to ϕl^+ l^-$ and $B^+ \to K^+ l^+ l^-$ ($l= μ,τ$) considering the contribution of Z-mediated FCNC. A noticeable deviation of the observables for these decay channels from the SM value is found because of non-universal $Z$-$bs$ coupling.
