论文标题

$μ\ toeγ$选择$(g-2)_ {e,μ} $ upzzles的标量leptoquark解决方案

$μ\to e γ$ selecting scalar leptoquark solutions for the $(g-2)_{e,μ}$ puzzles

论文作者

Doršner, Ilja, Fajfer, Svjetlana, Saad, Shaikh

论文摘要

我们研究了所有潜在的可行场景,这些方案可以产生同时解释带有单个标量leptoquark或一对标量的leptoquarks的$(g-2)_ {e} $和$(g-2)_ $数据所需的手性增强。我们提供了这些方案的分类,以满足$ \ \eγ$过程的现有分支比率的现有限制的能力。 $(g-2)_ {e,μ} $差异的同时解释与当前的实验数据相结合,这意味着$(g-2)_e $ loops完全是由于Charm Quark的传播是由于$(G-2)_μ$ loops归功于顶部Quark Propagation。 $(g-2)_e $环的场景归功于顶部(底部)夸克传播,充其量是距离$μ\ toeγ$分支比率的实验限制距离大约9(三个)数量级。总而言之,只有三种特定方案可以将$μ\传递给Eγ$测试,同时对$(g-2)_ {e,μ} $差异产生足够的影响,而新物理学基于标准模型费米昂内容。这些是$ s_1 $,$ r_2 $和$ s_1 \&s_3 $方案,在所有其他风味和对撞机数据约束方面,已经知道前两个已经是现象学上可行的候选者。我们表明,第三种情况是,与带电的lept子的右手耦合是由于$ s_1 $引起的,左手手续耦合与带电的lept子是由于$ s_3 $引起的,而两个leptoquarks则通过标准型号的higgs field混合,无法解决$(g-2)$(g-2)$ $(g-2)$(G-2)$(g-2)由于$ k_l^0 \与e^\ pmμ^\ mp $,$ z \ to e^+ e^ - $,以及$ z \toμ^+μ^ - $数据的相互作用,尽管有能力避免$μ\到eγ$限制。

We investigate all potentially viable scenarios that can produce the chiral enhancement required to simultaneously explain the $(g-2)_{e}$ and $(g-2)_μ$ data with either a single scalar leptoquark or a pair of scalar leptoquarks. We provide classification of these scenarios in terms of their ability to satisfy the existing limits on the branching ratio for the $μ\to e γ$ process. The simultaneous explanation of the $(g-2)_{e,μ}$ discrepancies, coupled with the current experimental data, implies that the $(g-2)_e$ loops are exclusively due to the charm quark propagation whereas the $(g-2)_μ$ loops are due to the top quark propagation. The scenarios where the $(g-2)_e$ loops are due to the top (bottom) quark propagation are, at best, approximately nine (three) orders of magnitude away from the experimental limit on the $μ\to e γ$ branching ratio. All in all, there are only three particular scenarios that can pass the $μ\to e γ$ test and simultaneously create large enough impact on the $(g-2)_{e,μ}$ discrepancies when the new physics is based on the Standard Model fermion content. These are the $S_1$, $R_2$, and $S_1 \& S_3$ scenarios, where the first two are already known to be phenomenologically viable candidates with respect to all other flavor and collider data constraints. We show that the third scenario, where the right-chiral couplings to charged leptons are due to $S_1$, the left-chiral couplings to charged leptons are due to $S_3$, and the two leptoquarks mix through the Standard Model Higgs field, cannot address the $(g-2)_{e}$ and $(g-2)_μ$ discrepancies at the $1σ$ level due to an interplay between $K_L^0 \to e^\pm μ^\mp$, $Z \to e^+ e^-$, and $Z \to μ^+ μ^-$ data despite the ability of that scenario to avoid the $μ\to e γ$ limit.

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