Subhadeep Mondal

Non-universal gaugino mass models under the lamppost of muon (g-2)

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Revisiting the exclusion limits from direct chargino-neutralino production at the LHC

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Polarized window for left-right symmetry and a right-handed neutrino at the Large Hadron-Electron Collider

supergravity scenario the gaugino masses can be non-universal. The patterns of these non-universalities are dictated by the vacuum expectation values of non-singlet chiral super-fields in visible sector. Here, we have analysed the model independent correlations among the gaugino masses with an aim to explain the [1 ÷ 3]σ excess of muon (g-2) (Δaμ). We have also encapsulated the interconnections among other low and high scale parameters, compatible with the collider constraints, Higgs mass, relic density and flavour data. We have noted that the existing non-universal models are not capable enough to explain Δaμ at [1 ÷ 2]σ level. In the process, we have also shown the impact of recent limits from the searches for disappearing track and long lived charged particles at the LHC. These are the most stringent limits so far ruling out a large parameter space allowed by other constraints. We have also performed model guided analysis where gaugino masses are linear combination of contributions coming from singlet and non-singlet chiral super-fields. Here, a new mixing parameter has been introduced. Following the earlier methodology, we have been able to constrain this mixing parameter and pin down the promising models on this notion.

Light neutralino dark matter inU(1)′models

We consider the production of a heavy neutrino and its possible signals at the Large Hadron-electron Collider (LHeC) in the context of an inverse-seesaw model for neutrino mass generation. The inverse seesaw model extends the Standard Model (SM) particle content by adding two neutral singlet fermions for each lepton generation. It is a well-motivated model in the context of generating nonzero neutrino masses and mixings. The proposed future LHeC machine presents us with a particularly interesting possibility to probe such extensions of the SM with new leptons due to the presence of an electron beam in the initial state. We show that the LHeC will be able to probe an inverse scenario with much better efficacy compared to the LHC with very nominal integrated luminosities as well as exploit the advantage of having the electron beam polarized to enhance the heavy neutrino production rates.

Search for a compressed supersymmetric spectrum with a light gravitino

We revisit the existing limits on the gaugino masses in various supersymmetric (SUSY) scenarios derived from Run-I data of the LHC. These limits obtained from the various final states rely heavily on the simplified assumptions regarding the masses, compositions, and decay branching ratios of the gauginos. The most severe exclusion limits on the gaugino masses are obtained from trilepton final states, while the second lightest neutralino (

Exploring collider aspects of a neutrinophilic Higgs doublet model in multilepton channels

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A polarized window for left-right symmetry at the Large Hadron-Electron Collider

) decaying into the SM-like Higgs and lightest SUSY particle results in the weakest bounds. Our aim is to assess the extent of deviation of these exclusion limits in more realistic scenarios. After a brief discussion on the various decay modes of the

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