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Title: Unified framework for B-anomalies, muon g – 2 and neutrino masses

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]; ORCiD logo [1]
  1. Oklahoma State Univ., Stillwater, OK (United States). Dept. of Physics
  2. Washington Univ., St. Louis, MO (United States). Dept. of Physics
  3. Max Planck Inst. fuer Kernphysik, Heidelberg (Germany)

We present a model of radiative neutrino masses which also resolves anomalies reported in B-meson decays, \( {R}_{D^{\left(\ast \right)}} \) and \( {R}_{K^{\left(\ast \right)}} \), as well as in muon g – 2 measurement, Δaμ. Neutrino masses arise in the model through loop diagrams involving TeV-scale leptoquark (LQ) scalars R2 and S3. Fits to neutrino oscillation parameters are obtained satisfying all flavor constraints which also explain the anomalies in \( {R}_{D^{\left(\ast \right)}} \), \( {R}_{K^{\left(\ast \right)}} \) and Δaμ within 1 σ. An isospin-3/2 Higgs quadruplet plays a crucial role in generating neutrino masses; we point out that the doubly-charged scalar contained therein can be produced in the decays of the S3 LQ, which enhances its reach to 1.1 (6.2) TeV at \( \sqrt{s} \) = 14 TeV high-luminosity LHC (\( \sqrt{s} \) = 100 TeV FCC-hh). We also present flavor-dependent upper limits on the Yukawa couplings of the LQs to the first two family fermions, arising from non-resonant dilepton (pp → ℓ+) processes mediated by t-channel LQ exchange, which for 1 TeV LQ mass, are found to be in the range (0.15 0.36). These limits preclude any explanation of \( {R}_{D^{\left(\ast \right)}} \) through LQ-mediated B-meson decays involving νe or νμ in the final state. We also find that the same Yukawa couplings responsible for the chirally-enhanced contribution to Δaμ give rise to new contributions to the SM Higgs decays to muon and tau pairs, with the modifications to the corresponding branching ratios being at (2–6)% level, which could be tested at future hadron colliders, such as HL-LHC and FCC-hh.

Research Organization:
Oklahoma State Univ., Stillwater, OK (United States); Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0016013; SC0017987; AC02-07CHI11359
OSTI ID:
1852080
Journal Information:
Journal of High Energy Physics (Online), Vol. 2021, Issue 3; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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