Exploring dark matter, neutrino mass and $R_{K^{(*)},\phi}$ anomalies in $L_{\mu}-L_{\tau}$ model

TL;DR

This paper explores a $U(1)_{L_{\mu}-L_{ au}}$ gauge extension of the Standard Model, analyzing dark matter, flavor anomalies, and neutrino masses through new particles and interactions, constrained by experimental data.

Contribution

It introduces a novel $U(1)_{L_{\mu}-L_{ au}}$ model with an inert doublet and leptoquark, providing a comprehensive analysis of dark matter, flavor anomalies, and neutrino mass generation.

Findings

Constrained parameter space consistent with relic density and direct detection bounds.

Predicted flavor observables $R_K$, $R_{K^*}$, and $R_\phi$ within experimental limits.

Identified viable regions for neutrino mass generation compatible with oscillation data.

Abstract

We investigate Majorana dark matter in a new variant of $U(1)_{L_{\mu}-L_{\tau}}$ gauge extension of Standard Model, where the scalar sector is enriched with an inert doublet and a $(\bar{3},1,1/3)$ scalar leptoquark. We compute the WIMP-nucleon cross section in leptoquark portal and the relic density mediated by inert doublet components, leptoquark and the new $Z^{\prime}$ boson. We constrain the parameter space consistent with Planck limit on relic density, PICO-60 and LUX bounds on spin-dependent direct detection cross section. Furthermore, we constrain the new couplings from the present experimental data on ${\rm Br}(\tau \to \mu \nu_\tau \bar \nu_\mu)$, ${\rm Br}( B \to X_s \gamma)$, ${\rm Br}( B^0 \to K^0 \mu^+ \mu^-)$, ${\rm Br}(B^+ \to K^+ \tau^+ \tau^-)$ and $B_s-\bar{B_s}$ mixing, which occur at one-loop level in the presence of $Z^\prime$ and leptoquark. Using the allowed parameter space, we estimate the form factor independent $P_{4,5}^\prime$ observables and the lepton non-universality parameters $R_{K}$, $R_{K^*}$ and $R_\phi$. We also briefly discuss about the neutrino mass generation at one-loop level and the viable parameter region to explain current neutrino oscillation data.