论文标题
没有新物理感染的稀有K和B衰减的标准模型预测
Standard Model Predictions for Rare K and B Decays without New Physics Infection
论文作者
论文摘要
标准模型（SM）不包含任何新物理（NP）对任何可观察到的贡献，但包含四个CKM参数，这些参数未由该模型预测。我们指出，如果这四个参数是在包括由NP感染的过程的全球拟合中确定的，则不能将其对稀有衰减分支比率的SM贡献视为对后者的真正SM贡献。另一方面，对于$ k $和$ k $稀有的衰减分支比率至$Δm_s$，$Δm_d$和$Δm_d$和$ | \ varepsilon_k | $的合适比例，可以获得不受CKM依赖性的真正SM预测。到目前为止，这三个可观察到的物品仅包含小的hadronic不确定性，并且已经进行了很好的测量，因此可以获得相当精确的SM预测所讨论的比率。在这种情况下，$ | v_ {cb} |-γ$图提供了$ΔF= 2 $部门中NP感染的快速测试，该图涉及$Δm_s$，$Δm_d$，$Δm_d$，$ | \ varepsilon_k | $，以及混合的cp-asymmetry $ s__s_s_ {cp-asymmetry $ s_s_ {$与目前的HADRONIC矩阵元素一样，该测试是负面的，假设$ΔF= 2 $扇区中的NP感染可忽略不计，并将这四个可观察到的值设置为实验性的值，可以获得所有$ K $和$ b $稀有的分支比例的SM预测，并且最准确地获得了$ the $ the $ the $ the $ the $ the the $ the ckm ckm y ckm ckm ckm ckm ckm ckm ckm to np ckm最准确。 独自的。使用此策略，我们可以通过$μ^+μ^ - $ pair或最终状态下的$μ^+μ^ - $^+μ^ - $^+μ^ - $^+μ^ - $^+μ^ - $^+μ^ - $ k $和$ b $衰减的26个分支比率的SM预测。最有趣的事实是低$ q^2 $ bin中的异常，$ b^+\ to k^+μ^+μ^ - $（$4.4σ$）和$ b_s \ to ϕμ^+μ^ - $（$4.8σ$）。
The Standard Model (SM) does not contain by definition any new physics (NP) contributions to any observable but contains four CKM parameters which are not predicted by this model. We point out that if these four parameters are determined in a global fit that includes processes which are infected by NP, the resulting SM contributions to rare decay branching ratios cannot be considered as true SM contributions to the latter. On the other hand true SM predictions, that are free from the CKM dependence, can be obtained for suitable ratios of the $K$ and $B$ rare decay branching ratios to $ΔM_s$, $ΔM_d$ and $|\varepsilon_K|$, all calculated within the SM. These three observables contain by now only small hadronic uncertainties and are already well measured so that rather precise true SM predictions for the ratios in question can be obtained. In this context the rapid test of NP infection in the $ΔF=2$ sector is provided by a $|V_{cb}|-γ$ plot that involves $ΔM_s$, $ΔM_d$, $|\varepsilon_K|$, and the mixing induced CP-asymmetry $S_{ψK_S}$. As with the present hadronic matrix elements this test turns out to be negative, assuming negligible NP infection in the $ΔF=2$ sector and setting the values of these four observables to the experimental ones, allows to obtain SM predictions for all $K$ and $B$ rare decay branching ratios that are most accurate to date and as a byproduct to obtain the full CKM matrix on the basis of $ΔF=2$ transitions alone. Using this strategy we obtain SM predictions for 26 branching ratios for rare semileptonic and leptonic $K$ and $B$ decays with the $μ^+μ^-$ pair or the $ν\barν$ pair in the final state. Most interesting turn out to be the anomalies in the low $q^2$ bin in $B^+\to K^+μ^+μ^-$ ($4.4σ$) and $B_s\to ϕμ^+μ^-$ ($4.8σ$).
