The impact of flavour changing neutral gauge bosons on B → X_sγ

2011/05/31 by Andrzej J. Buras, Luca Merlo, Emmanuel Stamou · 4 citations
Physics and Astronomy · #Boson #Gauge (firearms) #Gauge boson #Gauge theory #Mixing (physics) #Neutral current #Neutrino Physics Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Standard Model (mathematical formulation) #hep-ex #hep-ph

paper · pdf · doi:10.1007/jhep08(2011)124

published as JHEP 1108:124,2011 · 31 pages, 5 figures; version published on JHEP; added magic QCD numbers for flavour-violating Z gauge boson contribution to B -> X_s gamma

openalex publication_date 2011/08/01 · arxiv created 2012/03/10 · arxiv updated 2015/03/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The branching ratio of the rare decay B->X_s gamma provides potentially strong constraints on models beyond the Standard Model. Considering a general scenario with new heavy neutral gauge bosons, present in particular in Z' and gauge flavour models, we point out two new contributions to the B->X_s gamma decay. The first one originates from one-loop diagrams mediated by gauge bosons and heavy exotic quarks with electric charge -1/3. The second contribution stems from the QCD mixing of neutral current-current operators generated by heavy neutral gauge bosons and the dipole operators responsible for the B->X_s gamma decay. The latter mixing is calculated here for the first time. We discuss general sum rules which have to be satisfied in any model of this type. We emphasise that the neutral gauge bosons in question could also significantly affect other fermion radiative decays as well as non-leptonic two-body B decays, epsilon'/epsilon, anomalous (g-2)_mu and electric dipole moments.

Citations

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• MinimalZ′ models: present bounds and early LHC reach
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Cited by

• Global analysis of leptophilic Z′ bosons
• Particle-antiparticle mixing, CP violation and rare K and B decays in a minimal theory of fermion masses
• The anatomy of quark flavour observables in 331 models in the flavour precision era
• Dark Matter and gauged flavor symmetries