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Predictions for $$B_s \rightarrow {\bar{K}}^* \ell \,\ell $$Bs→K¯∗ℓℓ in non-universal $$Z'$$Z′ models
The European Physical Journal C ( IF 4.2 ) Pub Date : 2020-07-28 , DOI: 10.1140/epjc/s10052-020-8232-z
Ashutosh Kumar Alok , Amol Dighe , Shireen Gangal , Dinesh Kumar

The lepton flavor universality violating (LFUV) measurements \(R_K\) and \(R_{K^*}\) in B meson decays can be accounted for in non-universal \(Z'\) models. We constrain the couplings of these \(Z'\) models by performing a global fit to correlated \(b \rightarrow s \ell \ell \) and \(b \rightarrow d \ell \ell \) processes, and calculate their possible implications for \(B_s \rightarrow {\bar{K}}^*\ell \ell \) observables. For real new physics (NP) couplings, the 1\(\sigma \) favored parameters allow the corresponding LFUV ratio \(R_{K^*}^{(s)}\) in \(B_s \rightarrow {\bar{K}}^*\ell \ell \) to range between 0.8 and 1.2 at low \(q^2\). Complex NP couplings improve the best fit only marginally, however they allow a significant enhancement of the branching ratio, while increasing the range of \(R_{K^*}^{(s)}\ \)at low \(q^2\) to 0.8–1.8. We find that NP could cause zero-crossing in the forward–backward asymmetry \(A_{FB}\) to shift towards lower \(q^2\) values, and enhancement in the magnitude of integrated \(A_{FB}\). The CP asymmetry \(A_{CP}\) may be suppressed and even change sign. The simultaneous measurements of integrated \(R_{K^*}^{(s)}\ \)and \(A_{CP}\) values to 0.1 and 1% respectively, would help in constraining the effective NP Wilson coefficient \(C_9\) in \( b \rightarrow d \mu \mu \) interactions.

中文翻译:

非通用$$ Z'$$ Z'模型中$$ B_s \ rightarrow {\ bar {K}} ^ * \ ell \,\ ell $$ Bs→K¯ℓℓ的预测

轻子味普遍性违反(LFUV)测量\(R_K \)\(R_ {K ^ *} \)介子衰变可以在非通用占到\(Z'\)模型。我们通过对相关的\(b \ rightarrow s \ ell \ ell \)\(b \ rightarrow d \ ell \ ell \)过程执行全局拟合来约束这些\(Z'\)模型的耦合,并计算它们的\(B_s \ rightarrow {\ bar {K}} ^ * \ ell \ ell \)观测值的可能含义。对于真正的新的物理(NP)联轴器,1 \(\西格玛\)青睐参数允许对应LFUV比\(R_ {K ^ *} ^ {(S)} \)\(B_s \ rightarrow {\ bar {K}} ^ * \ ell \ ell \)在低\(q ^ 2 \)时在0.8到1.2之间。复杂的NP耦合仅略微改善了最佳拟合,但是它们允许显着提高分支比,同时在低\(q ^ 2 )的情况下扩大了\(R_ {K ^ *} ^ {(s}} \ \)的范围\)到0.8–1.8。我们发现,NP可能导致向前和向后不对称\(A_ {FB} \)的过零现象朝着更低的\(q ^ 2 \)值偏移,从而增强了积分\(A_ {FB} \ )。的CP不对称\(A_ {CP} \)可以被抑制,甚至改变符号。集成\(R_ {K ^ *} ^ {{s}} \ \ \)的同时测量\(A_ {CP} \)的值至0.1和1%分别将在限制有效的NP系数威尔逊帮助\(C_9 \)\(B \ RIGHTARROW d \亩\亩\)的相互作用。
更新日期:2020-07-28
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