Implications of lepton flavor universality violations in B decays
arXiv:1206.1872 · doi:10.1103/PhysRevLett.109.161801
Abstract
Present measurements of b->c tau nu and b->u tau nu transitions differ from the standard model predictions of lepton flavor universality by almost 4sigma. We examine new physics interpretations of this anomaly. An effective field theory analysis shows that minimal flavor violating models are not preferred as an explanation, but are also not yet excluded. Allowing for general flavor violation, right-right vector and right-left scalar quark currents are identified as viable candidates. We discuss explicit examples of two Higgs doublet models, leptoquarks as well as quark and lepton compositeness. Finally, implications for LHC searches and future measurements at the (super)B- factories are presented.
5 pages, 2 figures, version as published
References in corpus (11)
- On the B to D* tau nu Sensitivity to New Physics
- Search for charged Higgs bosons decaying via H+ -> tau nu in top quark pair events using pp collision data at sqrt(s) = 7 TeV with the ATLAS detector
- Width and from QCD Light-Cone Sum Rules
- Study of B --> pi l nu and B --> rho l nu Decays and Determination of |V_ub|
- B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
- Possible evidence for the breakdown of the CKM-paradigm of CP-violation
- Evidence for B- -> tau- nu_bar with a Semileptonic Tagging Method
- Tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu in the Standard Model
- Search for tb resonances in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
- Searching for third-generation composite leptoquarks at the LHC
- Leptoquarks decaying to a top quark and a charged lepton at hadron colliders