Soumya Rao

Higgsino Dark Matter in Nonuniversal Gaugino Mass Models

We study two simple and well motivated nonuniversal gaugino mass models, which predict higgsino dark matter. One can account for the observed dark matter relic density along with the observed Higgs boson mass of ~ 125 GeV over a large region of the parameter space of each model, corresponding to higgsino mass of ~ 1 TeV. In each case this parameter region covers the gluino mass range of 2-3 TeV, parts of which can be probed by the 14 TeV LHC experiments. We study these model predictions for LHC in brief and for dark matter detection experiments in greater detail.

Gauged U(1)Lμ−Lτ model in light of muon g − 2 anomaly, neutrino mass and dark matter phenomenology

Gauged U(1)Lμ−Lτ model has been advocated for a long time in light of muon g−2 anomaly, which is a more than 3σ discrepancy between the experimental measurement and the standard model prediction. We augment this model with three right-handed neutrinos (Ne,Nμ,Nτ) and a vector-like singlet fermion (χ) to explain simultaneously the non-zero neutrino masses and dark matter content of the Universe, while satisfying the anomalous muon g−2 constraints. We find that the model suffers stringent constraints from the simultaneous explanation of neutrino trident production and muon g−2 anomaly. In a large region of the parameter space, where contribution to muon g−2 anomaly comes partially and yet not ruled out by neutrino trident production, the model can explain the positron excess, observed at PAMELA, Fermi-LAT and AMS-02 through dark matter annihilation, while satisfying the relic density and direct detection limits.

Singlet fermion dark matter within left-right model

Abstract We discuss singlet fermion dark matter within a left-right symmetric model promoting baryon and lepton numbers as separate gauge symmetries. We add a simple Dirac fermionic dark matter singlet under S U ( 2 ) L , R with nonzero and equal baryon and lepton number which ensures electric charge neutrality. Such a dark matter candidate interacts with SM particles through the extra Z B , l gauge bosons. This can give rise to a dark matter particle of a few hundred GeV that couples to ∼ TeV scale gauge bosons to give the correct relic density. This model thus accommodates TeV scale Z B , l gauge bosons and other low scale BSM particles, which can be easily probed at LHC.

Light dark Higgs boson in minimal sub-GeV dark matter scenarios

A bstractMinimal scenarios with light (sub-GeV) dark matter whose relic density is obtained from thermal freeze-out must include new light mediators. In particular, a very well-motivated case is that of a new “dark” massive vector gauge boson mediator. The mass term for such mediator is most naturally obtained by a “dark Higgs mechanism” which leads to the presence of an often long-lived dark Higgs boson whose mass scale is the same as that of the mediator. We study the phenomenology and experimental constraints on two minimal, self-consistent dark sectors that include such a light dark Higgs boson. In one the dark matter is a pseudo-Dirac fermion, in the other a complex scalar. We find that the constraints from BBN and CMB are considerably relaxed in the framework of such minimal dark sectors. We present detection prospects for the dark Higgs boson in existing and projected proton beam-dump experiments. We show that future searches at experiments like Xenon1T or LDMX can probe all the relevant parameter space, complementing the various upcoming indirect constraints from astrophysical observations.

Impact of LHC data on muon

The long-standing discrepancy between the experimental determination by the Muon

g-2

g-2

solutions in a vectorlike extension of the constrained MSSM

Collaboration at Brookhaven and the Standard Model predictions for the anomalous magnetic moment of the muon cannot be explained within simple unified framework like the Constrained Minimal Supersymmetric Standard Model, but it can within its extension with vector-like fermions. In this paper we consider a model with an additional vector-like

Neutrino processes with power law dispersion relations

5+\bar{5}

Constraint on super-luminal neutrinos from vacuum Cerenkov processes

pair of

130 GeV Gamma Ray Signal in NMSSM by Internal Bremsstrahlung

SU(5)