20 Result(s)
within
Subhaditya Bhattacharya
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Article
Open AccessProbing flavor constrained SMEFT operators through tc production at the muon collider
We investigate flavor violating four-Fermi Standard Model Effective Field Theory (SMEFT) operators of dimension-six that can be probed via tc
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Article
Open AccessOptimal determination of new physics couplings: a comparative study
We study the determination of new physics (NP) parameters using the optimal observable technique (OOT) in situations where the standard model (SM) dominates over the NP effects, and when the NP dominates over ...
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Article
Open AccessAssociated production of Higgs and single top at the LHC in presence of the SMEFT operators
We analyse the single top production in association with the Higgs at the Large Hadron Collider (LHC) using Standard Model (SM) effective operators upto dimension six. We show that the presence of effective op...
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Article
Open AccessDistinguishing two dark matter component particles at e+e− colliders
We investigate ways of identifying two kinds of dark matter (DM) component particles at high-energy colliders. The strategy is to notice and distinguish double-peaks(humps) in the missing energy/transverse ene...
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Article
Open AccessElectroweak symmetry breaking and WIMP-FIMP dark matter
Electroweak Symmetry Breaking (EWSB) is known to produce a massive universe that we live in. However, it may also provide an important boundary for freeze-in or freeze-out of dark matter (DM) connected to Stan...
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Article
Open AccessProbing heavy charged fermions at e+e− collider using the optimal observable technique
In this work we study the production of color-neutral and singly-charged heavy leptons at the proposed International Linear Collider. We use the optimal observable technique to determine the statistical accura...
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Article
Open AccessEffective Leptophilic WIMPs at the e+e− collider
We consider higher-dimensional effective (EFT) operators consisting of fermion dark matter (DM) connecting to Standard Model (SM) leptons upto dimension six. Considering all operators together and assuming the...
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Chapter and Conference Paper
Majorana Dark Matter and Neutrino Mass in a Singlet-Doublet Extension of the Standard Model
A minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right-handed (RH) singlet neutrinos is proposed in order to explain dark matter and tiny neutrino mass simultaneously. ...
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Article
Open AccessFeebly coupled vector boson dark matter in effective theory
A model of dark matter (DM) that communicates with the Standard Model (SM) exclusively through suppressed dimension five operator is discussed. The SM is augmented with a symmetry U(1)X ⊗ Z2, where U(1)X is gauge...
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Article
Open AccessTwo component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches
The idea of this work is to investigate the constraints on the dark matter (DM) allowed parameter space from high scale validity (absolute stability of Higgs vacuum and perturbativity) in presence of multi par...
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Article
Open AccessMultipartite dark matter with scalars, fermions and signatures at LHC
Basic idea of this analysis is to achieve a two-component dark matter (DM) framework composed of a scalar and a fermion, with non-negligible DM-DM interaction contributing to thermal freeze out (hence relic de...
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Article
Open AccessDark side of the seesaw
In an attempt to unfold (if any) a possible connection between two apparently uncorrelated sectors, namely neutrino and dark matter, we consider the type-I seesaw and a fermion singlet dark matter to start wit...
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Article
Open AccessDark matter as a remnant of SQCD inflation
We propose a strongly coupled supersymmetric gauge theory that can accommodate both the inflation (in the form of generalized hybrid inflation) and dark matter (DM). In this set-up, we identify the DM as the G...
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Article
Open AccessMitigating direct detection bounds in non-minimal Higgs portal scalar dark matter models
The minimal Higgs portal dark matter model is increasingly in tension with recent results form direct detection experiments like LUX and XENON. In this paper we make a systematic study of simple extensions of ...
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Article
Open AccessFlavor origin of dark matter and its relation with leptonic nonzero θ 13 and Dirac CP phase δ
We propose a minimal extension of the standard model by including a U(1) flavor symmetry to establish a correlation between the relic abundance of dark matter, measured by WMAP and PLANCK satellite experiments...
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Article
Open AccessSupersymmetric left–right model with radiative neutrino mass and multipartite dark matter
We propose a unified extension of the standard model with three types of coexisting dark matter, motivated by three well-studied scenarios: (1) supersymmetry with
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Article
Open AccessPionic dark matter
We study a phenomenological model where the lightest dark matter (DM) particles are the pseudo-Goldstone excitations associated with a spontaneously broken symmetry, and transforming linearly with respect to a...
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Article
Effective Lagrangian approach to neutrinoless double beta decay and neutrino masses
Neutrinoless double beta (0νββ) decay can in general produce electrons of either chirality, in contrast with the minimal Standard Model (SM) extension with only the addition of the Weinberg operator, which predic...
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Article
A realistic model of neutrino masses with a large neutrinoless double beta decay rate
The minimal Standard Model extension with the Weinberg operator does accommodate the observed neutrino masses and mixing, but predicts a neutrinoless double beta (0νββ) decay rate proportional to the effective el...
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Article
Signatures of supersymmetry with non-universal Higgs mass at the Large Hadron Collider
We discuss large non-universality in the Higgs sector at high scale in supersymmetric theories, in the context of the Large Hadron Collider (LHC). In particular, we note that if
