Chayan Majumdar
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View article: Constraining the SMEFT extended with sterile neutrinos at FCC-ee
Constraining the SMEFT extended with sterile neutrinos at FCC-ee Open
A bstract We investigate how extensions of the Standard Model (SM) involving heavy neutral leptons (HNLs) can be probed at FCC-ee, the proposed high-energy circular e + e − collider. Using the effective field theory (EFT) approach, we dete…
View article: Exploring two component doublet dark matter
Exploring two component doublet dark matter Open
We propose a two-component dark matter (DM) scenario by extending the Standard Model with two additional SU(2)L doublets, one scalar, and another fermion. To ensure the stability of the DM components, we impose a global Z2×Z2′ symmetry. Th…
View article: Leptonic probes of alternative left-right symmetric models
Leptonic probes of alternative left-right symmetric models Open
We explore constraints on the parameter space of the alternative left-right model originating from the leptonic sector. Our analyses focuses on both lepton-flavor-conserving observables, particularly the anomalous magnetic moment of the mu…
View article: Neutrino Theory in the Precision Era
Neutrino Theory in the Precision Era Open
This document summarises discussions on future directions in theoretical neutrino physics, which are the outcome of a neutrino theory workshop held at CERN in February 2025. The starting point is the realisation that neutrino physics offer…
View article: Constraining the SMEFT Extended with Sterile Neutrinos at FCC-ee
Constraining the SMEFT Extended with Sterile Neutrinos at FCC-ee Open
We investigate how extensions of the Standard Model (SM) involving heavy neutral leptons (HNLs) can be probed at FCC-ee, the proposed high-energy circular $e^+e^-$ collider. Using the effective field theory (EFT) approach, we determine the…
View article: Relaxing limits from Big Bang Nucleosynthesis on Heavy Neutral Leptons with axion-like particles
Relaxing limits from Big Bang Nucleosynthesis on Heavy Neutral Leptons with axion-like particles Open
Heavy neutral leptons (HNLs) are constrained by requirements of Big Bang Nucleosynthesis (BBN) as their decays significantly impact the formation of the primordial elements. We propose here a model where the primary decay channel for the H…
View article: Neutrinoless double beta decay from scalar leptoquarks: interplay with neutrino mass and flavor physics
Neutrinoless double beta decay from scalar leptoquarks: interplay with neutrino mass and flavor physics Open
A bstract We perform a comprehensive analysis of neutrinoless double beta (0 νββ ) decay and its interplay with low-energy flavor observables in a radiative neutrino mass model with scalar leptoquarks S 1 ( $$ \overline{3} $$ , 1, 1/3)…
View article: Relaxing Limits from Big Bang Nucleosynthesis on Heavy Neutral Leptons with Axion-like Particles
Relaxing Limits from Big Bang Nucleosynthesis on Heavy Neutral Leptons with Axion-like Particles Open
Heavy neutral leptons (HNLs) are constrained by requirements of Big Bang Nucleosynthesis (BBN) as their decays significantly impact the formation of the primordial elements. We propose here a model where the primary decay channel for the H…
View article: Neutrinoless Double Beta Decay from Scalar Leptoquarks: Interplay with Neutrino Mass and Flavor Physics
Neutrinoless Double Beta Decay from Scalar Leptoquarks: Interplay with Neutrino Mass and Flavor Physics Open
We perform a comprehensive analysis of neutrinoless double beta decay and its interplay with low-energy flavor observables in a radiative neutrino mass model with scalar leptoquarks $S_1(\bar{3},1,1/3)$ and $\widetilde{R}_2(3,2,1/6)$. We c…
View article: Collider Signatures of $W_R$ boson in the Alternative Left-Right Model
Collider Signatures of $W_R$ boson in the Alternative Left-Right Model Open
Alternative Left-Right Models offer an attractive option to left-right models. Emerging from $E_6$ grand unification, these models are consistent with light scalars which do not induce flavour-changing neutral currents due to the presence …
View article: Dark matter in the Alternative Left Right model
Dark matter in the Alternative Left Right model Open
A bstract The Alternative Left-Right Model is an attractive variation of the usual Left-Right Symmetric Model because it avoids flavour-changing neutral currents, thus allowing the additional Higgs bosons in the model to be light. We show …
View article: Dark Matter in the Alternative Left Right Model
Dark Matter in the Alternative Left Right Model Open
The Alternative Left-Right Model is an attractive variation of the usual Left-Right Symmetric Model because it avoids flavour-changing neutral currents, thus allowing the additional Higgs bosons in the model to be light. We show here that …
View article: Neutrino mass and charged lepton flavor violation in an extended left-right symmetric model
Neutrino mass and charged lepton flavor violation in an extended left-right symmetric model Open
We consider an U(1)Lμ−Lτ extended left-right symmetric gauge theory where the neutrino masses are generated through inverse seesaw mechanism. In this model the muon (g−2) anomaly is accounted for by the mediation of Zμτ, the gauge boson of…
View article: Neutrino mass and charged lepton flavor violation in an extended left-right symmetric model
Neutrino mass and charged lepton flavor violation in an extended left-right symmetric model Open
We consider an $U(1)_{L_μ-L_τ}$ extended left-right symmetric gauge theory where the neutrino masses are generated through inverse seesaw mechanism. In this model the muon $(g-2)$ anomaly is accounted for by the mediation of $Z_{μτ}$, the …
View article: Vacuum Structure of Alternative Left-Right Model
Vacuum Structure of Alternative Left-Right Model Open
We investigate an Alternative Left-Right Model (ALRM) with $SU(2)_L$ as well as $SU(2)_R$ gauge groups, but unlike the traditional left-right symmetric models (LRSM) is not symmetric under the exchange of the fermion content. Interestingly…
View article: Muon (g-2) anomaly in extended left-right symmetric model
Muon (g-2) anomaly in extended left-right symmetric model Open
We consider a gauged $U(1)_{L_\mu-L_\tau}$ extension of the left-right symmetric theory in order to simultaneously explain neutrino mass, mixing and muon anomalous magnetic moment. We get sizeable contribution from the interaction of the n…
View article: Comparison of symmetric and asymmetric LR model in the context of $0\nu\beta\beta$ decay
Comparison of symmetric and asymmetric LR model in the context of $0\nu\beta\beta$ decay Open
We study the new physics contributions to neutrinoless double beta decay ($0\nu\beta\beta$) in a TeV scale left-right model with spontaneous D-parity breaking mechanism where $g_L \neq g_R$. We compare the predicted numerical values of hal…
View article: Neutrino mass, $0\nu\beta\beta$ signature in doublet left-right symmetric theories and its cosmological implications
Neutrino mass, $0\nu\beta\beta$ signature in doublet left-right symmetric theories and its cosmological implications Open
We consider a version of doublet Left-Right Symmetric Model (LRSM) in which the scalar sector consists of a Higgs bidoublet ($\Phi$), Higgs doublets ($H_{L,R}$) and a charged scalar ($\delta^+$) with $B-L=2$ leading to one-loop generated M…
View article: Observing left-right symmetry in the cosmic microwave background
Observing left-right symmetry in the cosmic microwave background Open
We consider the possibility of probing the left-right symmetric model (LRSM) via cosmic microwave background (CMB). We adopt the doublet left-right model (DLRM), where all fermions acquire masses via their couplings to the Higgs bidoublet.…
View article: Neutrino mass and muon $g-2$ explanation in $U(1)_{L_\mu-L_\tau}$ extension of left-right theories
Neutrino mass and muon $g-2$ explanation in $U(1)_{L_\mu-L_\tau}$ extension of left-right theories Open
We consider a gauged $U(1)_{L_\mu-L_\tau}$ extension of the left-right symmetric theory in order to simultaneously explain neutrino mass, mixing and the muon anomalous magnetic moment. We get sizeable contribution to muon $(g-2)$ anomaly (…
View article: A comparative study of 0νββ decay in symmetric and asymmetric left-right model
A comparative study of 0νββ decay in symmetric and asymmetric left-right model Open
We study the new physics contributions to neutrinoless double beta decay\n($0\\nu\\beta\\beta$) in a TeV scale left-right model with spontaneous D-parity\nbreaking mechanism where the values of the $SU(2)_L$ and $SU(2)_R$ gauge\ncouplings,…
View article: Neutrinoless double beta decay in a minimal left-right symmetric model with gauge coupling unification
Neutrinoless double beta decay in a minimal left-right symmetric model with gauge coupling unification Open
We consider a simple version of Left-Right Symmetric Model in which the scalar sector consists of a Higgs bidoublet ($\Phi$) with $B-L=0$, Higgs doublets ($H_{L,R}$) with $B-L=1$ and a charged scalar ($\delta^+$) with $B-L=2$ leading to ra…