Chair: Sunanda Banerjee
Chair: D. Kar/P. Mal
Chair: D. Nieto
Abstract: In this talk, we describe the impact of CPT violation on Sakharov conditions. Essentially the out-of-equilibrium condition will be modified in the presence of CPT violation since a tiny mass difference between particle and anti-particle will be naturally allowed when CPT violation is present.
Chair: D. Nieto
ABSTRACT: We show that in the usual type-I seesaw framework, augmented solely by a neutrino portal interaction, the dark matter relic density can be created through freeze-in, in a manner fully determined by the seesaw interactions and the DM particle mass. This simple freeze-in scenario, where dark matter is not in a seesaw state, proceeds through slow, seesaw-induced decays...
Chair: D. Kar/P. Mal
Abstract: Search for Dark Matter produced in association with a Higgs boson in proton–proton collisions at s = 13 TeV Ashim Roy B.N. Mandal University E-mail: ashim.roy@cern.ch On behalf of CMS collaboration Abstract A search for dark matter (DM) particles was conducted by analyzing proton-proton collision data collected by the CMS experiment at a center-of-mass energy of...
Abstract : We study the cosmology of an internally thermalized dark matter (DM), which is either coupled only gravitationally with the standard model (SM) sector, or may have a very feeble non-gravitational interaction that does not thermalize the two sectors. In the former scenario, the DM may undergo number-changing self-scatterings in the early Universe, eventually freezing out to the...
Abstract-The basic idea of this work is to achieve the observed relic density of a non-thermal dark matter(DM) and its connection with Cosmic Microwave Background (CMB) via additional relativistic degrees of freedom which are simultaneously generated during the period TBBN to TCMB from a long-lived dark sector particle.. To realize this phenomena we minimally extend the type-I seesaw scenario...
Abstract: The European Spallation Source (ESS), currently under construction in Sweden, will provide an intense pulsed neutrino flux allowing for high-statistics measurements of coherent elastic neutrino-nucleus scattering (CEvNS) with advanced nuclear recoil detectors. In this paper, we investigate in detail the possibility of constraining non-standard neutrino interactions (NSIs) through...
Abstract: The minimal $U(1)_{L_\mu-L_\tau}$ gauge symmetry extended Standard Model (SM) is a well motivated framework that resolves the discrepancy between the theoretical prediction and experimental observation of muon anomalous magnetic moment. We envisage the possibility of identifying the beyond Standard Model Higgs of $U(1)_{L_\mu-L_\tau}$ sector, non-minimally coupled to gravity, as the...
Abstract : The light matter abundance of our universe is sensitive to the neutron-to-proton ratio in the cosmic soup during the first phase of BBN. We consider a generic exotic particle species which co-annihilates with nucleons potentially modifying the neutron-to-proton ratio, thereby affecting the BBN predictions. In particular, the thermal freeze-out of the particle species via the...
Abstract: Axion is a pseudo-Nambu-Goldstone boson of U(1) Peccei-Quinn symmetry breaking introduced to solve the strong CP problem in Quantum Chromodynamics. Axion and axion-like particles possess certain properties that allow these particles to convert into photons when traversing through a magnetic field, making it feasible to probe them both in laboratory settings and in astrophysical...
Abstract: 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...
Abstract: We investigate the phenomenology of a non-thermal dark matter (DM) candidate in the context of flavor models that explain the hierarchy in the masses and mixings of quarks and leptons via the Froggatt-Nielsen (FN) mechanism. We point out a natural stabilizing mechanism for the DM within this framework . Also a very small coupling for the dark matter interaction with the visible...
Abstract: Giant molecular clouds (GMCs) are massive, dense areas of gas (mostly hydrogen) and dust in the Interstellar Medium (ISM). They provide a thick target for the Cosmic Rays (CR) to interact and produce gamma-rays and neutrinos. As these particles are neutral they are unaffected by the galactic magnetic fields and can be used to probe the origins and nature of the CR particles. In our...
Abstract: The investigation of jet production and the jet substructure in proton-proton collisions at the Large Hadron Collider holds great importance. They serve as vital tools for conducting precise tests of Quantum Chromodynamics, improving the understanding of proton structure, and also provides essential details to study physics beyond the Standard Model. Here, we present the latest jet...
Abstract- Belle-II has reported a 2.8 sigma deviation from standard model prediction in the branching ratio of B+ → K+ +inv decay mode. We enlighten this missing energy using a GeV scale scalar dark matter in an anomaly-free U (1)B−L framework. The new vector and scalar bosons coming from the gauge extension act as mediators for dark matter by providing annihilation channels and also...
Abstract : Machine learning algorithms have the capacity to discern intricate features directly from raw data. We demonstrated the performance of top taggers built upon three machine learning architectures: a BDT that uses jet-level variables (high-level features, HLF) as input, while a CNN (miniature version of ResNet) trained on the jet image, and a GNN (LorentzNet) trained on the particle...
Abstract:We study the N2 Leptogenesis in the presence of an extra complex singlet scalar field under U (1) symmetry extension. The VEV of the new scalar spontaneously breaks the U (1) symmetry. A remnant CP-like Z2 symmetry stabilizes the imaginary part of the complex scalar field as a Pseudo-Goldstone DM. The additional scalar which couples to RHN opens up new decay channels which can lead to...
Abstract: We introduce a novel hybrid framework combining type I and type II seesaw models for neutrino mass where a complex vacuum expectation value of a singlet scalar field breaks CP spontaneously. Using pragmatic organizing symmetries we demonstrate that such a model can simultaneously explain the neutrino oscillation data and generate observed baryon asymmetry through leptogenesis....
Abstract: We explore the pair production of third-generation scalar leptoquark at the Large Hadron Collider to next-to-leading order accuracy in QCD, matched to parton shower for a precise probing of the stemming model. We propose to tag two boosted top-like fatjets produced from the decay of heavy leptoquarks in association with notably large missing transverse momentum and consider them as...
The LHC has yielded an unprecedented volume of data from 2016 to 2018, presenting a unique opportunity to investigate fundamental questions in particle physics. This involves probing rare processes beyond the standard model and testing the standard model's limits with greater precision, potentially leading to the discovery of new physics. To leverage this data fully, novel methods are...
Abstract: The undetected dark matter search is performed in the final state of Higgs decaying to a pair of tau leptons with large missing transverse momentum (MET) by using the proton-proton collision data of CMS detector at CERN LHC, at the center of mass, √S=13 TeV. The benchmark models for this particular search are performed with two simplified models of DM + H productions. The first one...
Abstract : We will discuss an Effective Field Theory which extends the SM by an Axion-Like Particle (ALP) and mainly focus on the interactions of a light ALP to heavy SM particles. The talk is dedicated to the role of the LHC in probing ALP couplings particularly with the Higgs boson and the gauge bosons. We discuss a recent proposal to hunt for ALP signals in the non-resonant regime, i.e....
Abstract: We conducted a study on temporal and spectral analysis of observational data from OJ 287, which was observed from April 2005 to April 2020. We used a Chi-square minimization technique for spectral analysis. Among all observations most intense flaring was observed in April 2020 and flaring was observed in soft sub-bands 0.3-2 keV. The detected flaring was dominated by the thermal...
Abstract - A knowledge of the QCD equation of state is crucial not only for understanding the dynamics of relativistic heavy ion collision experiments, but also for knowing the young universe. One of the familiar ways to estimate this equation of state and understand QCD thermodynamics is through Taylor series of various thermodynamic observables. Recently, exponential resummation of this...
Abstract: The CMS experiment at LHC has an extensive program to look for signatures of new physics to address several observed phenomena not explained by the standard model of particle physics. In this talk, I will review the recent CMS results on searches for a massive resonance decaying to final states involving one or more Higgs bosons. In this scope, I will highlight some exciting excesses...
Abstract: Supersymmetric models with low electroweak fine-tuning are more prevalent on the string landscape than fine-tuned models. We assume a fertile patch of landscape vacua containing the minimal supersymmetric standard model (MSSM) as a low-energy EFT. Such models are characterized by light higgsinos in the mass range of a few hundred GeV whilst top squarks are in the 1-2.5 TeV range....
Chair: Basudeb Dasgupta
Chair: Basudeb Dasgupta
Chair: Basudeb Dasgupta
Chair: James Beacham
Abstract: If multiple thermal weakly interacting massive particle (WIMP) dark matter candidates exist, then their capture and annihilation dynamics inside a massive star such as Sun could change from conventional method of study. With a simple correction to time evolution of dark matter (DM) number abundance inside the Sun for multiple dark matter candidates, significant changes in DM...
Abstract: Low-energy neutrinos can be a significant background in the search for dark matter (DM) through direct detection. In this context, we aim to quantify the sub-GeV DM-electron scattering parameter space where the neutrino background overshadows any potential DM signal. Because DM and neutrinos have distinct energy spectra, theoretically, they can be distinguished with substantial...
Abstract: Though the Standard Model assumes the neutrinos to be massless, the phenomenon of neutrino oscillation shows that they have tiny but non-zero masses. Scotogenic models, in which neutrino masses are generated at one-loop level and remain tiny due to loop suppression, are very interesting in this regard. In this model, since the beyond Standard Model (BSM) particles entering inside the...
We report a search for a heavy neutral lepton (HNL) that mixes
predominantly with ντ . The search utilizes data collected with the
Belle detector at the KEKB asymmetric energy e+e− collider. The data
sample was collected at and just below the center-of-mass energies of the
Υ(4S) and Υ (5S) resonances and has an integrated luminosity of 915 fb−1,
corresponding to (836 ± 12)...
Chair: Utpal Chattopadhyay
Abstract: We explore the parameter space of the phenomenological Minimal Supersymmetric Standard Model (pMSSM) with a light neutralino thermal dark matter (m_{DM}≤m_{Higgs boson}/2) that is consistent with current collider and astrophysical constraints. We consider both positive and negative values of the higgsino mass parameter (μ). Our investigation shows that the recent experimental results...
Abstract: We have consider a model by combining type I seesaw and scotogenic part. We have fitted neutrino mass and mixing from the neutrino oscillation data. As the sctogenic model has dark Z_2 symmetry, we have studied the fermionic dark matter phenomenology in detail. As neutrino mass generation allows lepton flavor to be violated, lepton flavor violating decays put a strong constraint on...
Chair: Swagata Mukherjee
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 phenomena of neutrino oscillations indicate that neutrinos have nonzero masses. Since then it has prompted immense interest to find out the source of production of neutrino-mass. Neutrino mass can be either Dirac or Majorana in nature. One intermediate way is to consider tiny Majorana masses as compared to the Dirac mass terms. In this particular scenario, neutrinos are called...
