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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...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
2017
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2017.10.027 http://cds.cern.ch/record/2267170 |
_version_ | 1780954561995866112 |
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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 |
record_format | invenio |
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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