Rare B Decays And Lepton Flavour Universality Tests at LHCb

10th International Conference on Kaon Physics

Tolk, Siim^1

University of Cambridge, LHCb, CERN, United Kingdom^1

关键词: B-decays;    Heavy flavours;    Lepton flavour violations;    Lepton number;    New physics;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012012/pdf
DOI  :  10.1088/1742-6596/800/1/012012

来源: IOP

【 摘 要 】

In the lepton sector the Standard Model incorporates both lepton-flavour and lepton-number universality. In a generic New Physics scenario this is not necessarily the case and these symmetries need to be experimentally tested. Numerous searches have failed to find any signs of Lepton Flavour Violation (LFU) or Lepton Flavour Universality Violation (LFUV). New Physics could, however, generate LFUV in the heavy flavour sector where the existing experimental constraints are weaker. Recent searches at LHCb focus on precisely this unexplored territory by studying the B decays involving b → cτυ and b → sl+l-transitions. Several theoretically and experimentally clean observables, such as R(D∗) or R(K), diverge from the Standard Model predictions and could be the first signs of LFUV.