Conveners
Parallel: DM + neutrino: Day 2 Afternoon Session 1
- Arindam Chatterjee (Shiv Nadar Institution of Eminence (Deemed to be University))
Parallel: DM + neutrino: Day 2 Afternoon Session 2
- S Mitra
Parallel: DM + neutrino: Day 3 Afternoon Session 1
- Sukanta Dutta (SGTB Khalsa College, University of Delhi.)
Parallel: DM + neutrino: Day 3 Afternoon Session 2
- Mamta Dahiya (S.G.T.B. Khalsa College, University of Delhi)
Neutrino flavor oscillation is a widely studied physical phenomenon with significant implications for our understanding of particle physics and the search for physics beyond the standard model. Oscillation arises due to the mixing between flavor and mass eigenstates, and their evolution over time. It is a quantum system where flavor transitions are typically studied using probabilistic...
In this talk, I will demonstrate how having two WIMPs, each with different masses, and mass splitting with the NLSP, generated at a collider through a decay chain, can result in double peaks in the missing energy or missing transverse momentum distribution of the multilepton signal. I will also outline a set of criteria to identify and segregate the second peak in the missing energy spectrum,...
We constrain the parameter space of a simplified fermionic dark matter model with a spin-0 mediator from low energy processes. FCNC observables like neutral pseudoscalar meson mixing, rare decays of $ B_0, B_s^0, K $ meson, global fit of all the $ b \to s \ell \ell $ observables, invisible decays of B and K meson are considered along with FCCC observables like $ t \to b W_{\mu} $ anomalous...
We study a scenario where origin of dark matter is related to the Dirac nature of neutrino, known as the light Dirac neutrino portal dark matter (DNPDM). In such DNPDM set up, light dirac neutrinos take the role of mediating the interactions between dark matter (DM) and standard model (SM) bath. Here, we consider a UV complete model in gauged B-L framework extended by three species of right...
In this study, we propose a new version of the Scotogenic model, it is an economically appealing theoretical framework which addresses two problems of particle physics, neutrino mass generation and dark matter. The Scotogenic model generates neutrino mass via a $1$-loop Feynman diagram by extending the standard model by the $Z_2$ discrete symmetry.
In our model, we extend the standard model...
In recent years, there has been a growing interest in the direct detection of sub-GeV dark matter, which is theoretically well-motivated. However, probing sub-GeV cold dark matter particles has posed a persistent challenge, as their typical momenta are insufficient to induce recoils above the thresholds of conventional direct detection experiments. Notably, even very strongly interacting dark...
The Dirac scotogenic model provides an elegant mechanism which explains small Dirac neutrino masses and neutrino mixing with a single symmetry simultaneously protecting the ''Diracness'' of the neutrinos and the stability of the dark matter candidate. In addition to exploring the phenomenology of dark matter, we will also investigate the implications for lepton flavor violation, the muon...
In a two-component dark matter (DM) set-up, when DM$_1$ is in equilibrium with the thermal bath, the other one, DM$_2$, can be equilibrated only by the sizeable interaction with the DM$_1$, even without any connection with the visible-sector particles. We affirm that such DM candidates (DM$_2$) have unique `freeze-out' characteristics impacting the relic density, direct, indirect and collider...
In this work, we explore the intriguing possibility of connecting self-interacting dark matter (SIDM) with the recently observed exceptionally bright and long-duration gamma-ray burst (GRB221009A). The proposed minimal scenario involves a light scalar mediator, simultaneously enabling dark matter (DM) self-interaction and explaining the observed very high energy photons from GRB221009A...
We study the possibility of generating light Dirac neutrino mass via scotogenic mechanism where singlet-doublet fermion dark matter (DM) plays non-trivial role in generating one-loop neutrino mass, anomalous magnetic moment of muon $(g-2)_\mu$ as well as additional relativistic degrees of freedom $\Delta{N_{\rm eff}}$ within reach of cosmic microwave background (CMB) experiments. We show that...
Extra dimensional models are very popular and useful framework to address
many important problems in particle physics. On the other hand extension of the Standard Model (SM) with an extra U(1)Lmu−Ltau gauge group is a great motivation to solve muon (g-2) anomaly (recently 5.1 sigma deviation). Here we considered an extra dimensional U(1)Lmu − Ltau model where only the Kaluza-Klein (KK) modes...
In a scattering process in a thermal plasma, thermal fluctuation alongside with quantum fluctuation affects the annihilation cross section of particles. This is important in the context to dark matter annihilation cross section since the relic densities are now being more precisely measured. We investigate the effect of thermal fluctuation on the annihilation cross section of a $SU(2) \times...
The lightest Neutralino is a good Dark Matter (DM) candidate
in the R-parity conserving Minimal Supersymmetric Standard Model (MSSM). In this work, we consider light Higgsino-like Neutralino as the Lightest
Stable Particle (LSP), thanks to a relatively small $\mu$ parameter. We then estimate the prominent radiative corrections to the Neutralino-Neutralino-Higgs boson vertices.
We show that...
Modular symmetries offer a dynamic approach to understanding the flavour structure of leptonic mixing. Using the modular $\mathcal{A}_4$ flavour symmetry integrated in a type-II seesaw, we propose a simple and minimalistic model that restricts the neutrino oscillation parameter space and, most importantly, introduces a sum rule in the physical neutrino masses. When combined with the mass...
We study the two-component boosted dark matter (DM) scenario in a neutrinophilic two-Higgs doublet model (ν2HDM), which comprises one extra Higgs doublet with a MeV scale CP-even scalar H. This model is extended with a light (∼ 10 MeV) singlet scalar DM ϕ3, which is stabilized under the existing Z2 symmetry and can only effectively annihilate through scalar H. As the presence of a light H...
Cosmological observations offer valuable methods for probing various characteristics of Dark Matter (DM). We examine the cosmological implications of higher-dimensional Non-Relativistic Effective Field Theory (EFT) operators for Dark Matter(DM) - electron interactions. We focus on velocity-independent operators and simultaneously incorporate DM-electron scattering and DM annihilation into...
In this study, we examine the phenomenon of photon axion conversion occurring in the spacetime surrounding a black hole. Observations of the black hole in the center of the M87 galaxy (M87 * ) through the Event Horizon Telescope imaged polarized synchrotron emission at 230 GHz on event horizon scales. Specifically, we focus on the potential existence of a magnetic field around the supermassive...
