info:eu-repo/semantics/article
Angular and polarization observables for Majorana-mediated B decays with effective interactions
Fecha
2020-09-27Registro en:
Duarte, Lucía; Zapata, Gabriel Damián; Sampayo, Oscar Alfredo; Angular and polarization observables for Majorana-mediated B decays with effective interactions; Springer; European Physical Journal C: Particles and Fields; 80; 9; 27-9-2020; 1-32
1434-6044
CONICET Digital
CONICET
Autor
Duarte, Lucía
Zapata, Gabriel Damián
Sampayo, Oscar Alfredo
Resumen
We probe the effective field theory extending the Standard Model with a sterile neutrino in B meson decays at B factories and lepton colliders, using angular and polarization observables. We put bounds on different effective operators characterized by their distinct Dirac–Lorentz structure, and probe the N-mediated B decays sensitivity to these interactions. We define a forward–backward asymmetry AFBℓγ between the muon and photon directions for the B→ μνγ decay, which allows us to separate the SM contribution from the effective lepton number conserving and violating processes, mediated by a near on-shell N. Using the most stringent constraints on the effective parameter space from Belle and BaBar we find that a measurement of the final polarization Pτ in the rare B-→ℓ1-ℓ2-π+ decays can help us infer the scalar or vector interaction content in the N production or decay vertices. We find that the B meson decays are more sensitive to scalar operators.