Tathagata Ghosh

Interpretation of the diphoton excess at CMS and ATLAS

We consider the diphoton resonance at the 13 TeV LHC in a consistent model with new scalars and vector-like fermions added to the Standard Model, which can be constructed from orbifold grand unified theories and string models. The gauge coupling unification can be achieved, neutrino masses can be generated radiatively, and the electroweak vacuum stability problem can be solved. To explain the diphoton resonance, we study a spin-0 particle, and discuss various associated final states. We also constrain the couplings and number of the introduced heavy multiplets for the new resonances width at 5 or 40 GeV.

New limits on the dark matter lifetime from dwarf spheroidal galaxies using Fermi-LAT

Dwarf spheroidal galaxies (dSphs) are promising targets for the indirect detection of dark matter through gamma-ray emission due to their proximity, lack of astrophysical backgrounds and high dark matter density. They are often used to place restrictive bounds on the dark matter annihilation cross section. In this paper, we analyze six years of {\it Fermi}-LAT gamma-ray data from 19 dSphs that are satellites of the Milky Way, and derive from a stacked analysis of 15 dSphs, robust 95\% confidence level lower limits on the dark matter lifetime for several decay channels and dark matter masses between

Exploring the doubly charged Higgs boson of the left-right symmetric model using vector boson fusionlike events at the LHC

\sim 1

Probing compressed sleptons at the LHC using vector boson fusion processes

GeV and

Neutralinos and sleptons at the LHC in light of muon ( g − 2 ) μ

10

Confronting Galactic center and dwarf spheroidal gamma-ray observations with cascade annihilation models

TeV. Our findings are based on a bin-by-bin maximum likelihood analysis treating the J-factor as a nuisance parameter using PASS 8 event-class. Our constraints from this ensemble are among the most stringent and solid in the literature, and competitive with existing ones coming from the extragalactic gamma-ray background, galaxy clusters, AMS-02 cosmic ray data, Super-K and ICECUBE neutrino data, while rather insensitive to systematic uncertainties. In particular, among gamma-ray searches, we improve existing limits for dark matter decaying into

Can We Discover Double Higgs Production at the LHC

\bar{b}b

Exploring the jet multiplicity in the 750 GeV diphoton excess

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S U ( 6 ) GUT origin of the TeV-scale vectorlike particles associated with the 750 GeV diphoton resonance

\mu^+\mu^-

Probing squeezed bino-slepton spectra with the Large Hadron Collider

) for DM masses below