论文标题
新物理学在$ b \ tok_1μ^+μ^ - $衰减过程中的含义
Implications of new physics in $B \to K_1 μ^+ μ^-$ decay processes
论文作者
论文摘要
最近，在衰减过程中观察到了$（2-3）σ$的几个差异，这是由风味变化中性电流（FCNC）转换介导的$ b \ to s \ ell^+ el^+ ell^ - $，这可能被认为是新物理学（NP）的吸烟枪支信号。这些有趣的NP提示吸引了很多关注，并尝试在其他相关过程中寻找可能的NP签名，这些过程是通过相同的夸克级过渡介导的。在这项工作中，我们对FCNC的FCNC衰减$ b $ erson进行了全面分析，到轴向矢量中的$ k_1（1270）$和$ k_1（1400）$，它们是$ 1^3p_1 $和$ 1^1p_1 $ k_ {1a} $ k_ {1a} $ k_ {1a} $ k_ a} $的$ 1^3p_1 $和$ 1^1p_1 $ k_} $的杂物。使用$ b \ to k_1 $ formage formage sur规则方法评估的形式，我们研究了罕见的独家半衰减衰变$ b \ to k_1（1270）μ^+μ^ - $和$ b \ $和$ b \ to K_1（1400）μ^+μ^ - $。 Considering all the possible relevant operators for $b \to s \ell^+ \ell^-$ transitions, we study their effects on various observables such as branching fractions, lepton flavor universality violating ratio ($R_{K_1})$, forward-backward asymmetries, and lepton polarization asymmetries of these processes.这些结果不仅可以增强对混合角度的理论理解，而且还可以作为探测新物理学的好工具。
In recent times, several discrepancies at the level of $(2-3)σ$ have been observed in the decay processes mediated by flavour changing neutral current (FCNC) transitions $b \to s \ell^+ \ell^-$, which may be considered as the smoking-gun signal of New Physics (NP). These intriguing hints of NP have attracted a lot of attention and many attempts are made to look for the possible NP signature in other related processes, which are mediated through the same quark-level transitions. In this work, we perform a comprehensive analysis of the FCNC decays of $B$ meson to axial vector mesons $ K_1(1270)$ and $ K_1(1400)$, which are admixture of the $1^3P_1$ and $1^1P_1$ states $K_{1A}$ and $K_{1B}$, in a model independent framework. Using the $ B \to K_1$ form factors evaluated in the light cone sum rule approach, we investigate the rare exclusive semileptonic decays $ B \to K_1(1270) μ^+ μ^-$ and $ B \to K_1(1400) μ^+ μ^-$. Considering all the possible relevant operators for $b \to s \ell^+ \ell^-$ transitions, we study their effects on various observables such as branching fractions, lepton flavor universality violating ratio ($R_{K_1})$, forward-backward asymmetries, and lepton polarization asymmetries of these processes. These results will not only enhance the theoretical understanding of the mixing angle but also serve as a good tool for probing New Physics.
