Tree-level lepton universality violation in the presence of sterile neutrinos: impact for R K and R π
Open Access
- 8 February 2013
- journal article
- research article
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2013 (2) , 1-13
Abstract
We consider a tree-level enhancement to the violation of lepton flavour universality in light meson decays arising from modified Wℓν couplings in the standard model minimally extended by sterile neutrinos. Due to the presence of additional mixings between the active (left-handed) neutrinos and the new sterile states, the deviation from unitarity of the leptonic mixing matrix intervening in charged currents might lead to a tree-level enhancement of R P = Γ(P → eν)/Γ(P → μν), with P = K, π. We illustrate these enhancements in the case of the inverse seesaw model, showing that one can saturate the current experimental bounds on Δr K (and Δr π ), while in agreement with the different experimental and observational constraints.Keywords
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