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Title: Unified explanation of flavor anomalies, radiative neutrino masses, and ANITA anomalous events in a vector leptoquark model

Journal Article · · Physical Review D

Driven by the recent experimental hints of lepton-flavor-universality violation in the bottom-quark sector, we consider a simple extension of the Standard Model (SM) with an additional vector leptoquark $$V_{\text{LQ}}$$ (3,1,2/3) and a scalar diquark $$S_{\text{DQ}}$$(6,1,4/3) under the SM gauge group $$SU(3)_c × SU(2)_L × U(1)_Y$$, in order to simultaneously explain the $b → sℓ^+ ℓ^–$ (with $$\textit{ℓ = e, μ}$$) and $$b → cl^–\bar{ν}_l$$ (with $$\textit{l = e, μ, τ}$$) flavor anomalies, as well as to generate small neutrino masses through a two-loop radiative mechanism. We perform a global fit to all the relevant and up-to-date $b → sℓ^+ ℓ^–$ and $$b → cl^–\bar{ν}_l$$ data under the assumption that the leptoquark couples predominantly to second and third-generation SM fermions. We then look over the implications of the allowed parameter space on lepton-flavor-violating $$\textit{B}$$ and $$\textit{τ}$$ decay modes, such as $$B_s → l^+_i l^–_ j, B → K^{(\ast)} l^+_i l^–_j, B_s → \phi l^+_i l^–_j, Υ(nS) → μτ$$, and $$τ → μγ, τ → μ\phi(η^{(')})$$, respectively. Minimally extending this model by adding a fermion singlet $$\textit{χ}$$(1, 1, 0) also explains the ANITA anomalous upgoing events. Furthermore, we provide complementary constraints on leptoquark and diquark couplings from high-energy collider and other low-energy experiments to test this model.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Science and Engineering Research Board (SERB). Government of India; Sponsoring Consortium for Open Access Publishing in Particle Physics (SCOAP3)
Grant/Contract Number:
SC0017987; EMR/2017/001448
OSTI ID:
1712799
Alternate ID(s):
OSTI ID: 1852458
Journal Information:
Physical Review D, Journal Name: Physical Review D Vol. 102 Journal Issue: 9; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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