论文标题
ALP解决方案的中性$ b $ - nomalies的成本
The cost of an ALP solution to the neutral $B$-anomalies
论文作者
论文摘要
$ b $衰变中的中性异常是根据有效的现场理论框架内的轴突样粒子（ALP）的树级交换来分析的。探索了ALP耦合到电子和MUON的完整二维参数空间。 The solutions to $R_K$ and to the two energy bins of $R_{K^\ast}$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of $B$ mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory.基于阿尔卑斯山的解决方案比$ b $介子重，或者是雄性质量两倍的较轻的解决方案，被证明被排除在外。相反，在$ r_k $和/或$ r_ {k^\ ast} $ $2σ$敏感性中，壳中壳阿尔卑斯山的交换提供了解决方案，这在技术上与这些约束在技术上兼容。此外，在$ r_ {k^\ ast} $的两个能量箱窗户之间的边界上确定了一个“金色ALP质量”，它们可以同时解释这两个$ r_ {k^\ ast} $ anomalies和$ r_k $;这要求提供不同能源箱的便利性，这很容易清除（不太可能）的可能性。还讨论了涂抹对数据分析的影响。当考虑到循环效果时，找到的解决方案可以与电子的$ g-2 $有关的数据兼容，但不能与MUON的$ G-2 $同时兼容。此外，循环效应可能需要一些耦合值的微调。
The neutral anomalies in $B$ decays are analysed in terms of the tree-level exchange of an axion-like-particle (ALP), within the effective field theory framework. The complete two-dimensional parameter space for ALP couplings to electrons and muons is explored. The solutions to $R_K$ and to the two energy bins of $R_{K^\ast}$ are confronted with the impact of ALP exchange on other observables (meson oscillations, leptonic and semileptonic decays of $B$ mesons including searches for new resonances, astrophysical constraints), as well as with the theoretical domain of validity of the effective theory. Solutions based on ALPs heavier than $B$ mesons, or lighter than twice the muon mass, are shown to be excluded. In contrast, the exchange of on-shell ALPs provides solutions to $R_K$ and/or $R_{K^\ast}$ within $2σ$ sensitivity which are technically compatible with those constraints. Furthermore, a ''golden ALP mass'' is identified at the frontier between the two energy bin windows of $R_{K^\ast}$, which could simultaneously explain these two $R_{K^\ast}$ anomalies together with $R_K$; this calls for the convenience of different energy binning which would easily clear up this (unlikely) possibility. The impact of smearing on data analysis is also discussed. When loop effects are taken into account, the solutions found can be in addition compatible with the data on the $g-2$ of the electron but not simultaneously with those on the $g-2$ of the muon. Furthermore, loop effects may require fine-tunings of some coupling values.
