2024/04/11 by Fleischer, Robert, Malami, Eleftheria, Rehult, Anders +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2404.07588
Experimental data on rare B-meson decays indicate deviations from Standard Model predictions. In studies of these decays, possible new sources of CP violation are often neglected. We discuss CP violation in the rare B-meson decays B→ Kℓ+ℓ- (ℓ = μ,e) and point to two phenomena that arise when new sources of CP violation are included. First, the Wilson coefficients C9ℓ and C10ℓ become complex, and we show how we can extract their values from measurements of direct and mixing-induced CP asymmetries. Second, new sources of CP violation can generate nontrivial lepton flavour universality violation. Such a violation is usually measured through ratios like RK and RK^*, but we show that measuring only these ratios leaves a large parameter space unexplored. These results bring exciting opportunities to reveal New Physics effects in the high-precision era.