Biplob Bhattacherjee

Wino dark matter and future dSph observations

A bstractWe discuss the indirect detection of the wino dark matter utilizing gammaray observations of dwarf spheroidal galaxies (dSphs). After carefully reviewing current limits with particular attention to astrophysical uncertainties, we show prospects of the wino mass limit in future gamma-ray observation by the Fermi-LAT and the GAMMA-400 telescopes. We find that the improvement of the so-called J-factor of both the classical and the ultra-faint dSphs will play a crucial role to cover whole mass range of the wino dark matter. For example, with δ(log10J) = 0.1 for both the classical and the ultra-faint dSphs, whole wino dark matter mass range can be covered by 15 years and 10 years data at the Fermi-LAT and GAMMA-400 telescopes, respectively.

Compressed supersymmetry at 14 TeV LHC

In this work we study the collider phenomenology of a compressed supersymmetric model with gluino (e) and the lightest neutralino (e � 0 ). All other sparticles are assumed to be heavy. We consider gluino pair production at the 14 TeV LHC and present the mass reach of gluino as a function of mass splitting between gluino and the the lightest neutralino. We find that the gluino mass below 1 TeV can be excluded at 95% CL with integrated luminosity of 100 fb 1 for extreme degenerate case where mass separation between gluino and the lightest neutralino is about 20 GeV. On the other hand, the lower bound on the mass of gluino increases to 1.2 - 1.3 TeV if the mass splitting between the gluino and e � 0 is about 200 GeV. This result shows that for degenerate gluino, the current mass limit may extend approximately 400-500 GeV at 14 TeV LHC.

Search for the minimal universal extra dimension model at the LHC with {radical}(s)=7 TeV

Universal Extra Dimension (UED) model is one of the popular extension of the Standard Model (SM) which offers interesting phenomenology. In the minimal UED (mUED) model, Kaluza-Klein (KK) parity conservation ensures that n = 1 KK states can only be pair produced at colliders and the lightest KK particle is stable. In most of the parameter space, first KK excitation of SM hypercharge gauge boson is the lightest one and it can be a viable dark matter candidate. Thus, the decay of n = 1 KK particles will always involve missing transverse energy (ET / ) as well as leptons and jets. The production cross sections of n = 1 KK particles are large and such particles may be observed at the Large Hadron Collider (LHC). We explore the mUED discovery potential of the LHC with p s = 7 TeV in the multileptonic final states. Since in the early LHC run, precise determination of ET / may not be possible, we examine the LHC reach with and without using ET / information. We observe that ET / cut will not improve mUED discovery reach significantly. We have found that opposite sign di-lepton channel is the most promising discovery mode and with first fb 1 of collected luminosity, LHC will be able to discover the strongly interacting n = 1 KK particles with masses upto 800 � 900 GeV. PACS numbers: 13.85.Qk, 12.60.-i,14.80.Rt

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

Top polarization and stop mixing from boosted jet substructure

m_h=98

The Lepton Flavour Violating Higgs Decays at the HL-LHC and the ILC

~GeV is consistent with the small excess (

Role of supersymmetric heavy Higgs boson production in the self-coupling measurement of 125 GeV Higgs boson at the LHC

\sim 2.3 \sigma

Do new data on [B+ -> tau+ nu_tau] decays point to an early discovery of supersymmetry at the LHC?

) observed at the LEP in

Associated jet and subjet rates in light-quark and gluon jet discrimination

e^+ e^-\rightarrow Zh

Status of the MSSM Higgs sector using global analysis and direct search bounds, and future prospects at the High Luminosity LHC

, with