4.4 Article

A natural origin for the LHCb anomalies

Journal

JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 9, Pages -

Publisher

SPRINGER
DOI: 10.1007/JHEP09(2016)118

Keywords

Phenomenology of Field Theories in Higher Dimensions; Phenomenology of Large extra dimensions

Funding

  1. MINECO [CICYT-FEDER-FPA2014-55613-P]
  2. Severo Ochoa Excellence Program of MINECO [SO-2012-0234]
  3. Secretaria d'Universitats i Recerca del Departament d'Economia i Coneixement de la Generalitat de Catalunya [2014 SGR 1450]
  4. European Union [PIEF-GA-2013-623006]
  5. ICREA Funding Source: Custom

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The anomalies recently found by the LHCb collaboration in B-meson decays seem to point towards the existence of new physics coupled non-universally to muons and electrons. We show that a beyond-the-Standard-Model dynamics with these features naturally arises in models with a warped extra-dimension that aim to solve the electroweak Hierarchy Problem. The attractiveness of our set-up is the fact that the dynamics responsible for generating the flavor anomalies is automatically present, being provided by the massive Kaluza-Klein excitations of the electroweak gauge bosons. The flavor anomalies can be easily reproduced by assuming that the bottom and muon fields have a sizable amount of compositeness, while the electron is almost elementary. Interestingly enough, this framework correlates the flavor anomalies to a pattern of corrections in the electroweak observables and in flavor-changing processes. In particular the deviations in the bottom and muon couplings to the Z-boson and in Delta F = 2 flavor-changing observables are predicted to be close to the present experimental bounds, and thus potentially testable in near-future experiments.

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