showing 3 related works from this author
Testing WWγ vertex in radiative muon decay
2019
Large numbers of muons will be produced at facilities developed to probe the lepton-flavor-violating process μ→eγ. We show that by constructing a suitable asymmetry, radiative muon decay μ→eγνμν̄e can also be used to test the WWγ vertex at such facilities. The process has two missing neutrinos in the final state, and upon integrating their momenta the partial differential decay rate shows no radiation-amplitude zero. However, we establish that an easily separable part of the normalized differential decay rate that is odd under the exchange of photon and electron energies does have a zero in the case of the standard model (SM). This new type of zero has hitherto not been studied in the liter…
Scrutinizing right-handed neutrino portal dark matter with Yukawa effect
2018
Analyzing the neutrino Yukawa effect in the freeze-out process of a generic dark matter candidate with right-handed neutrino portal, we identify the parameter regions satisfying the observed dark matter relic density as well as the current Fermi-LAT and H.E.S.S. limits and the future CTA reach on gamma-ray signals. In this scenario the dark matter couples to the Higgs boson at one-loop level and thus could be detected by spin-independent nucleonic scattering for a reasonable range of the relevant parameters.
Dark Matter in Leptoquark Portal
2021
A beyond the standard model portal scenario for Majorana fermion dark matter (DM) particle with leptoquark being the mediator field is of the main focus of this study. We explore the parameter space of the only unknown coupling in the model which is sensitive to all three main features of a DM model, namely, relic density, direct detection as well as indirect detection, while being consistent with the collider searches. The AMS-02 data for antiproton flux imposes stringent bound till date which excludes the DM mass up to \(400\,\)GeV at 95% C.L. The LUX 2016 data for DM-neutron scattering cross section allows the region compatible with relic density; however, the future sensitivity of LZ ex…