Measuring the breaking of lepton flavor universality in BK*+

Nicola Serra, Rafael Silva Coutinho, and Danny van Dyk
Phys. Rev. D 95, 035029 – Published 23 February 2017

Abstract

We propose measurements of weighted differences of the angular observables in the rare decays BK*+. The proposed observables are very sensitive to the difference between the Wilson coefficients C9(e) and C9(μ) for decays into electrons and muons, respectively. At the same time, the charm-induced hadronic contributions are kinematically suppressed to 7%(4%) in the region 1GeV2q26GeV2, as long as lepton-flavor universality breaking occurs only in C9(). This suppression becomes stronger for the region of low hadronic recoil, q215GeV2.

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  • Received 9 November 2016

DOI:https://doi.org/10.1103/PhysRevD.95.035029

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Nicola Serra*, Rafael Silva Coutinho, and Danny van Dyk

  • Physik-Institut, Universität Zürich, Winterthurer Strasse 190, 8057 Zürich, Switzerland

  • *nicola.serra@cern.ch
  • rafael.silva.coutinho@cern.ch
  • dvandyk@physik.uzh.ch

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Issue

Vol. 95, Iss. 3 — 1 February 2017

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