论文标题
qed in $ \ bar b \ to \ bar k \ ell^+\ ell^ - $ lfu比率：理论与实验，蒙特卡洛研究
QED in $\bar B \to \bar K \ell^+\ell^-$ LFU ratios: Theory versus Experiment, a Monte Carlo Study
论文作者
论文摘要
使用包括所有红外敏感日志的介子有效理论中获得的分析结果，我们构建了一个专用的蒙特卡洛框架，以描述$ \ bar b \ to \ bar b \ bar k \ ell^+el^+ell^ - $中的QED校正。对于中性模式，$ \ bar b^0 \ to \ bar k^0 \ ell^+\ ell^ - $，我们进行了详细的数值比较，而用通用用途的光子示波工具照片获得的数值比较。比较仅在罕见模式上时，在少数人每分钟的水平上达成了良好的一致性。此外，我们的框架使我们能够研究炭共振的影响。在实验分析中未通过照片描述的干扰效应在Dilepton不变质量区域$ q^2 <6 \ textrm {gev}^2 $中很小，该效果用于确定$ r_ {k^{（*）}} $。使用半分析框架，我们评估了完整，稀有和共振的模式。因此，我们讨论了检查共振模式的减法的策略，该谐振模式在$ q^2 \ 6 \ textrm {gev}^2 $下在电子模式下具有较大的影响。
Using analytic results obtained in a meson effective theory, that includes all infrared sensitive logs, we build a dedicated Monte Carlo framework to describe QED corrections in $\bar B \to \bar K \ell^+\ell^-$ for a generic form factor. For the neutral mode $\bar B^0 \to \bar K^0 \ell^+\ell^-$, we perform a detailed numerical comparison versus those obtained with the general-purpose photon-shower tool PHOTOS. The comparison indicates a good agreement, at the few per-mil level, when focusing on the rare mode only. In addition, our framework allows us to investigate the impact of the charmonium resonances. Interference effects, not described by PHOTOS in the experimental analysis, are found to be small in the dilepton invariant mass region $q^2 < 6 \textrm{GeV}^2$, which is used to determine $R_{K^{(*)}}$. Using a semi-analytic framework we assess the full, rare and resonant, mode. Based thereupon, we discuss strategies to check the subtraction of the resonant mode, which has a sizeable impact at $q^2 \approx 6 \textrm{GeV}^2$ in the electron mode.
