Debottam Das

Mixed neutralino dark matter in nonuniversal gaugino mass models

We have considered nonuniversal gaugino mass models of supergravity, arising from a mixture of two superfield contributions to the gauge kinetic term, belonging to a singlet and a nonsinglet representation of the grand unified theory group. In particular we analyze two models, where the contributing superfields belong to the singlet and the 75-dimensional, and the singlet and the 200-dimensional representations of SU(5). The resulting lightest superparticle is a mixed bino-Higgsino state in the first case and a mixed bino-wino-Higgsino state in the second. In both cases one obtains cosmologically compatible dark matter relic density over broad regions of the parameter space. We predict promising signals in direct dark matter detection experiments as well as in indirect detection experiments via high energy neutrinos coming from their pair annihilation in the Sun. Besides, we find interesting γ-ray signal rates that will be probed in the Fermi gamma-ray space telescope. We also expect promising collider signals at LHC in both cases.

Implications of the 98 GeV and 125 GeV Higgs scenarios in nondecoupling supersymmetry with updated ATLAS, CMS, and PLANCK data

We discuss both MSSM and NMSSM scenarios in which the lightest Higgs boson with

Nonzero trilinear parameter in the minimal supergravity model: Dark matter and collider signals at the Fermilab Tevatron and CERN LHC

m_h=98

Nonuniversal scalar mass scenario with Higgs funnel region of supersymmetric dark matter: A signal-based analysis for the Large Hadron Collider

~GeV is consistent with the small excess (

Right sneutrino dark matter and a monochromatic photon line

\sim 2.3 \sigma

Probing the light Higgs pole resonance annihilation of dark matter in the light of XENON100 and CDMS-II observations

) observed at the LEP in

Looking for a heavy W-ino lightest supersymmetric particle in collider and dark matter experiments

e^+ e^-\rightarrow Zh

One-loop contribution to the neutrino mass matrix in NMSSM with right-handed neutrinos and tri-bimaximal mixing

, with

Probing sterile neutrinos in the framework of inverse seesaw mechanism through leptoquark productions

h \rightarrow b {\bar b}

Large evolution of the bilinear Higgs coupling parameter in supersymmetric models and reduction of phase sensitivity

process and the heavier Higgs boson of mass close to 125~GeV as the observed candidate of the SM Higgs like particle at the LHC. We show the allowed regions in the non-decoupling Higgs zone of MSSM parameter space which are consistent with several low energy constraints coming from heavy flavour physics, latest experimental data on Higgs signals and lower limit on superparticle masses from 7~TeV and 8~TeV LHC run. We also implement the constraints from the relic density of the cold dark matter as obtained from the recent PLANCK data. Additionally, we discuss the possibility of observing the light Higgs boson of mass 98~GeV at the 14~TeV LHC run via