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Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays

We consider a flavoured B−L gauge symmetry under which only the third generation fermions are charged. Such a symmetry can survive at low energies ( ∼TeV ) while still allowing for two superheavy right-handed neutrinos, consistent with neutrino masses via see-saw and leptogenesis. We describe a mech...

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Detalles Bibliográficos
Autores principales: Alonso, Rodrigo, Cox, Peter, Han, Chengcheng, Yanagida, Tsutomu T.
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2017.10.027
http://cds.cern.ch/record/2267170
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author Alonso, Rodrigo
Cox, Peter
Han, Chengcheng
Yanagida, Tsutomu T.
author_facet Alonso, Rodrigo
Cox, Peter
Han, Chengcheng
Yanagida, Tsutomu T.
author_sort Alonso, Rodrigo
collection CERN
description We consider a flavoured B−L gauge symmetry under which only the third generation fermions are charged. Such a symmetry can survive at low energies ( ∼TeV ) while still allowing for two superheavy right-handed neutrinos, consistent with neutrino masses via see-saw and leptogenesis. We describe a mechanism for generating Yukawa couplings in this model and also discuss the low-energy phenomenology. Interestingly, the new gauge boson could explain the recent hints of lepton universality violation at LHCb, with a gauge coupling that remains perturbative up to the Planck scale. Finally, we discuss more general U(1) symmetries and show that there exist only two classes of vectorial U(1) that are both consistent with leptogenesis and remain phenomenologically viable at low-energies.
id cern-2267170
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
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spelling cern-22671702022-06-24T03:03:05Zdoi:10.1016/j.physletb.2017.10.027http://cds.cern.ch/record/2267170engAlonso, RodrigoCox, PeterHan, ChengchengYanagida, Tsutomu T.Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decayshep-phParticle Physics - PhenomenologyWe consider a flavoured B−L gauge symmetry under which only the third generation fermions are charged. Such a symmetry can survive at low energies ( ∼TeV ) while still allowing for two superheavy right-handed neutrinos, consistent with neutrino masses via see-saw and leptogenesis. We describe a mechanism for generating Yukawa couplings in this model and also discuss the low-energy phenomenology. Interestingly, the new gauge boson could explain the recent hints of lepton universality violation at LHCb, with a gauge coupling that remains perturbative up to the Planck scale. Finally, we discuss more general U(1) symmetries and show that there exist only two classes of vectorial U(1) that are both consistent with leptogenesis and remain phenomenologically viable at low-energies.We consider a flavoured $B-L$ gauge symmetry under which only the third generation fermions are charged. Such a symmetry can survive at low energies (~TeV) while still allowing for two superheavy right-handed neutrinos, consistent with neutrino masses via see-saw and leptogenesis. We describe a mechanism for generating Yukawa couplings in this model and also discuss the low-energy phenomenology. Interestingly, the new gauge boson could explain the recent hints of lepton universality violation at LHCb, with a gauge coupling that remains perturbative up to the Planck scale. Finally, we discuss more general $U(1)$ symmetries and show that there exist only two classes of vectorial $U(1)$ that are both consistent with leptogenesis and remain phenomenologically viable at low-energies.arXiv:1705.03858IPMU17-0075CERN-TH-2017-106oai:cds.cern.ch:22671702017-05-10
spellingShingle hep-ph
Particle Physics - Phenomenology
Alonso, Rodrigo
Cox, Peter
Han, Chengcheng
Yanagida, Tsutomu T.
Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays
title Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays
title_full Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays
title_fullStr Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays
title_full_unstemmed Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays
title_short Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays
title_sort flavoured $b-l$ local symmetry and anomalous rare $b$ decays
topic hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.physletb.2017.10.027
http://cds.cern.ch/record/2267170
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