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Title: Lepton non-universality in B decays and fermion mass structure

Abstract

We consider the possibility that the neutral-current B anomalies are due to radiative corrections generated by Yukawa interactions of quarks and leptons with new vector-like quark and lepton electroweak doublets and new Standard Model singlet scalars. We show that the restricted interactions needed can result from an underlying Abelian family symmetry and that the same symmetry can give rise to an acceptable pattern of quark and charged lepton masses and mixings, providing a bridge between the non-universality observed in the B-sector and that of the fermion mass matrices. We construct two simple models, one with a single singlet scalar in which the flavour changing comes from quark and lepton mixing and one with an additional scalar in which the flavour changing can come from both fermion and scalar mixing. We show that for the case the new quarks are much heavier than the new leptons and scalars the B anomalies can be due to box diagrams with couplings in the perturbative regime consistent with the bounds coming from $$B_8-\overline{B}_8, K-\overline{K}$$ and $$D-\overline{D}$$ mixing as well as other lepton family number violating processes. The new states can be dark matter candidates and, in the two scalar model with a light scalar of O(60) GeV and vector-like lepton of O(100) GeV, there can be a simultaneous explanation of the B-anomalies, the muon anomalous magnetic moment and the dark matter abundance.

Authors:
 [1];  [2];  [3]
  1. Univ. of California, San Diego, CA (United States)
  2. Univ. of Warsaw (Poland)
  3. Univ. of Oxford (United Kingdom)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Centre, Poland
OSTI Identifier:
1611234
Grant/Contract Number:  
SC0009919; DEC-2015/18/M/ST2/00054; DEC-2015/19/B/ST2/02848; DEC-2016/23/G/ST2/04301
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 12; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; physics; Beyond Standard Model; heavy quark physics; quark masses and SM parameters

Citation Formats

Grinstein, B., Pokorski, S., and Ross, G. G. Lepton non-universality in B decays and fermion mass structure. United States: N. p., 2018. Web. https://doi.org/10.1007/jhep12(2018)079.
Grinstein, B., Pokorski, S., & Ross, G. G. Lepton non-universality in B decays and fermion mass structure. United States. https://doi.org/10.1007/jhep12(2018)079
Grinstein, B., Pokorski, S., and Ross, G. G. Thu . "Lepton non-universality in B decays and fermion mass structure". United States. https://doi.org/10.1007/jhep12(2018)079. https://www.osti.gov/servlets/purl/1611234.
@article{osti_1611234,
title = {Lepton non-universality in B decays and fermion mass structure},
author = {Grinstein, B. and Pokorski, S. and Ross, G. G.},
abstractNote = {We consider the possibility that the neutral-current B anomalies are due to radiative corrections generated by Yukawa interactions of quarks and leptons with new vector-like quark and lepton electroweak doublets and new Standard Model singlet scalars. We show that the restricted interactions needed can result from an underlying Abelian family symmetry and that the same symmetry can give rise to an acceptable pattern of quark and charged lepton masses and mixings, providing a bridge between the non-universality observed in the B-sector and that of the fermion mass matrices. We construct two simple models, one with a single singlet scalar in which the flavour changing comes from quark and lepton mixing and one with an additional scalar in which the flavour changing can come from both fermion and scalar mixing. We show that for the case the new quarks are much heavier than the new leptons and scalars the B anomalies can be due to box diagrams with couplings in the perturbative regime consistent with the bounds coming from $B_8-\overline{B}_8, K-\overline{K}$ and $D-\overline{D}$ mixing as well as other lepton family number violating processes. The new states can be dark matter candidates and, in the two scalar model with a light scalar of O(60) GeV and vector-like lepton of O(100) GeV, there can be a simultaneous explanation of the B-anomalies, the muon anomalous magnetic moment and the dark matter abundance.},
doi = {10.1007/jhep12(2018)079},
journal = {Journal of High Energy Physics (Online)},
number = 12,
volume = 2018,
place = {United States},
year = {2018},
month = {12}
}

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Works referenced in this record:

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    Generic loop effects of new scalars and fermions in b → sℓ+ℓ− and a vector-like 4th generation
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    • Arnan, Pere; Crivellin, Andreas; Fedele, Marco
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    • DOI: 10.1007/jhep06(2019)118

    B anomalies and dark matter: a complex connection
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    Phenomenology of an extended IDM with loop-generated fermion mass hierarchies
    journal, July 2019

    • Cárcamo Hernández, A. E.; Kovalenko, Sergey; Pasechnik, Roman
    • The European Physical Journal C, Vol. 79, Issue 7
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    New Physics in $${\varvec{b \rightarrow s \ell ^+ \ell ^-}}$$ b → s ℓ + ℓ - confronts new data on lepton universality
    journal, August 2019


    Hadron collider sensitivity to fat flavourful Z′s for R K ∗ $$ {R}_{K^{\left(\ast \right)}} $$
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    • Journal of High Energy Physics, Vol. 2019, Issue 3
    • DOI: 10.1007/jhep03(2019)137

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    journal, October 2019

    • Smolkovič, Aleks; Tammaro, Michele; Zupan, Jure
    • Journal of High Energy Physics, Vol. 2019, Issue 10
    • DOI: 10.1007/jhep10(2019)188

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    text, January 2019

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    • Deutsches Elektronen-Synchrotron, DESY, Hamburg
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