Discriminating 1D new physics solutions in → Decays
Wen-Feng Duan (Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, China); Shao-Ping Li (Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, China); Xin-Qiang Li (Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, China, Center for High Energy Physics, Peking University, China); Ya-Dong Yang (Institute of Particle and Nuclear Physics, Henan Normal University, China, Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, China)
The recent measurements of $ R_{K^+} $ , $ R_{K^+} $ , $ R_{K^+} $ , $ R_{K^+} $ , a set of CP-averaged angular observables for the $ R_{K^+} $ decay and its isospin partner $ R_{K^+} $ by the LHCb Collaboration consistently hint at lepton universality violation in the $ R_{K^+} $ transitions. In this work, we first perform global fits to the $ R_{K^+} $ data and show that five one-dimensional scenarios, i.e, $ R_{K^+} $ , $ R_{K^+} $ , $ R_{K^+} $ , $ R_{K^+} $ , and $ R_{K^+} $ can best explain the so-called B anamolies. Furthermore, we explore how these scenarios can be distinguished from each other. For this purpose, we first study the combinations of four angular asymmetries $ R_{K^+} $ and find that they cannot distinguish the five new physics scenarios. We then show that a newly constructed ratio $ R_{K^+} $ can uniquely discriminate the five new physics scenarios in proper intervals of $ R_{K^+} $ if it can be measured with percent-level precision.