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Journal of High Energy Physics

, 2017:10 | Cite as

Flavour anomalies after the R K ∗ measurement

  • Guido D’Amico
  • Marco Nardecchia
  • Paolo Panci
  • Francesco Sannino
  • Alessandro Strumia
  • Riccardo Torre
  • Alfredo Urbano
Open Access
Regular Article - Theoretical Physics

Abstract

The LHCb measurement of the μ/e ratio R K ∗ indicates a deficit with respect to the Standard Model prediction, supporting earlier hints of lepton universality violation observed in the R K ratio. We show that the R K and R K ∗ ratios alone constrain the chiralities of the states contributing to these anomalies, and we find deviations from the Standard Model at the 4σ level. This conclusion is further corroborated by hints from the theoretically challenging b + μ distributions. Theoretical interpretations in terms of Z′, lepto-quarks, loop mediators, and composite dynamics are discussed. We highlight their distinctive features in terms of the chirality and flavour structures relevant to the observed anomalies.

Keywords

Beyond Standard Model Technicolor and Composite Models 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2017

Authors and Affiliations

  • Guido D’Amico
    • 1
  • Marco Nardecchia
    • 1
  • Paolo Panci
    • 1
  • Francesco Sannino
    • 1
    • 2
  • Alessandro Strumia
    • 1
    • 3
  • Riccardo Torre
    • 4
    • 5
  • Alfredo Urbano
    • 1
  1. 1.Theoretical Physics Department, CERNGenevaSwitzerland
  2. 2.CP3-Origins and Danish IAS, University of Southern DenmarkOdenseDenmark
  3. 3.Dipartimento di Fisica dell’Università di Pisa and INFNPisaItaly
  4. 4.Institut de Théorie des Phénomènes Physiques, EPFLLausanneSwitzerland
  5. 5.INFN, Sezione di GenovaGenovaItaly

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