Narendra Sahu

Signal of right-handed charged gauge bosons at the LHC?

We point out that the recent excess observed in searches for a right-handed gauge boson WR at CMS can be explained in a left-right symmetric model with D-parity violation. In a class of SO(10) models, in which D parity is broken at a high scale, the left-right gauge symmetry breaking scale is naturally small, and at a few TeV the gauge coupling constants satisfy gR≈0.6gL. Such models therefore predict a right-handed charged gauge boson WR in the TeV range with a suppressed gauge coupling as compared to the usually assumed manifest left-right symmetry case gR=gL. The recent CMS data show excess events which are consistent with the cross section predicted in the D-parity breaking model for 1.9TeV<MWR<2.4TeV. If the excess is confirmed, it would in general be a direct signal of new physics beyond the Standard Model at the LHC. A TeV scale WR would for example not only rule out SU(5) grand unified theory models. It would also imply B-L violation at the TeV scale, which would be the first evidence for baryon or lepton number violation in nature, and it has strong implications on the generation of neutrino masses and the baryon asymmetry in the Universe.

Asymmetric Inelastic Inert Doublet Dark Matter from Triplet Scalar Leptogenesis

The nature of dark matter (DM) particles and the mechanism that provides their measured relic abundance are currently unknown. In this paper we investigate inert scalar and vector like fermion doublet DM candidates with a charge asymmetry in the dark sector, which is generated by the same mechanism that provides the baryon asymmetry, namely baryogenesis-via-leptogenesis induced by decays of scalar triplets. At the same time the model gives rise to neutrino masses in the ballpark of oscillation experiments via type II seesaw. We discuss possible sources of depletion of asymmetry in the DM and visible sectors and solve the relevant Boltzmann equations for quasi-equilibrium decay of triplet scalars. A Monte-Carlo-Markov-Chain analysis is performed for the whole parameter space. The survival of the asymmetry in the dark sector leads to inelastic scattering o nuclei. We then apply bayesian statistic to infer the model parameters favoured by the current experimental data, in particular the DAMA annual modulation and Xenon100 exclusion limit. The latter strongly disfavours asymmetric scalar doublet DM of mass O( TeV) as required by DM-DM oscillations, while an asymmetric vector like fermion doublet DM with mass around 100 GeV is a good candidate for DAMA annual modulation yet satisfying the constraints from Xenon100 data.

Reconciling the 2 TeV Excesses at the LHC in a Linear Seesaw Left-Right Model

We interpret the 2 TeV excesses at the LHC in a left-right symmetric model with Higgs doublets and spontaneous D-parity violation. The light neutrino masses are understood via a linear seesaw, suppressed by a high D-parity breaking scale, and the heavy neutrinos have a pseudo-Dirac character. In addition, with a suppressed right-handed gauge coupling gR/gL≈0.6 in an SO(10) embedding, we can thereby interpret the observed eejj excess at CMS. We show that it can be reconciled with the diboson and dijet excesses within a simplified scenario based on our model. Moreover, we find that the mixing between the light and heavy neutrinos can be potentially large, which would induce dominant nonstandard contributions to neutrinoless double beta decay via long-range λ and η neutrino exchange.

Double beta decay, lepton flavor violation, and collider signatures of left-right symmetric models with spontaneous D-parity breaking

We propose a class of left-right symmetric models (LRSMs) with spontaneous

Extended Zee model for neutrino mass, leptogenesis, and sterile-neutrino-like dark matter

D

Probing Unified Origin of Dark Matter and Baryon Asymmetry at PAMELA/Fermi

-parity breaking, where

Inflation, baryogenesis and gravitino dark matter at ultra low reheat temperatures

SU(2{)}_{R}

Tight connection between direct and indirect detection of dark matter through Higgs portal couplings to a hidden sector

breaks at the TeV scale while discrete left-right symmetry breaks around

Predictive model for dark matter, dark energy, neutrino masses, and leptogenesis at the TeV scale

1{0}^{9}\text{ }\text{ }\mathrm{GeV}

Cosmic Ray Anomalies and Dark Matter Annihilation to Muons via a Higgs Portal Hidden Sector

. By embedding this framework in a nonsupersymmetric