The axion solution to the strong CP problem is closely entwined with the flavor structure of the standard model. So our model attempts at explaining the Flavor puzzle through the a gauged abelian Frogatt Nielsen mechanism and thereby automatically end up with a "quality axion" as the result of a residual anomalous $U(1)_{PQ}$ symmtery. This is achieved in a DFSZ like scenario with a "Flavon"...
The Standard Model of Particle Physics explains many natural phenomena yet remains incomplete. Vectorlike quarks (VLQs) lie at the heart of many extensions seeking to address the Hierarchy Problem, as they can naturally cancel the mass divergence for the Higgs boson. This talk summarizes recent ATLAS searches for VLQs which decay to quarks, or leptons, using Run 2 data collected at the LHC.
We report on the search for dark matter conducted at the CMS detector using the full Run-2 dataset from the LHC.This report focuses on the dark matter searches conducted using proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector. It highlights the various event types investigated and discusses the findings in relation to several dark matter theories.
The latest results on BSM physics searches using long-lived signatures with the CMS detector will be presented.
Generalized global symmetries are present in theories of particle physics, and understanding their structure can give insight into these theories and UV completions thereof. We will identify non-invertible chiral symmetries in certain flavorful Z' extensions of the Standard Model, and this will lead us to interesting nonperturbative effects in theories of gauged non-Abelian flavor. For the...
Results from search for the rare decays of the standard model\,(SM) Higgs and Z boson to a J/$\Psi$ or $\Psi'$ meson and a photon, with subsequent decay of the meson to a pair of muons will be presented in this contribution. The analysis is performed using data recorded by the CMS detector during full Run 2 from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to...
LHC Results: Experiment
Statistically significant excesses exist at around 152 GeV in associated di-photon production contained in the sidebands of SM Higgs analyses. They are most pronounced in the $\gamma \gamma + \tau$, $\gamma \gamma + \text{MET}$, $\gamma \gamma + \geq 1 \ell +\geq 1b$, $\gamma \gamma + 4 j$ signal regions, and can be explained by the Drell-Yan production of new Higgs bosons, i.e. $p p \to W \to...
The rare $b\rightarrow s\ell^+ \ell^-$ transition is a well-explored transition, particularly for new physics beyond the standard model. Similar to this transition, another flavor changing neutral current transition $b\rightarrow s\nu \bar{\nu}$ involving a dineutrino pair also plays an important role in the search for new physics. The $B \rightarrow K \nu \bar{\nu}$ mode is one such...
We show that observations of primordial gravitational waves of inflationary origin can shed light into the scale of flavor violation in a flavon model which also explains the mass hierarchy of fermions. The energy density stored in oscillations of the flavon field around the minimum of its potential redshifts as matter and is expected to dominate over radiation in the early universe. At the...
The inflationary paradigm of the early universe has been extraordinarily consistent with the observations of the cosmic microwave background radiation,however, we still haven’t found a specific model of inflation that fits well within a high-energy theory. Analysis of recently Planck data shows that many previously popular field theoretical models like quadratic and quartic models of inflation...
Theory
The study of neutrino oscillations provides critical insights into the fundamental properties of neutrinos and their role in the universe. This talk focuses on the contributions of the Japanese long-baseline neutrino experiments to advancing our understanding of neutrino physics, specifically on my role in calibrating the upcoming Hyper-Kamiokande detector.
We construct a brane world SU(5) Grand Unified Theory in five-dimensional space-time by using domain walls. The SU(5) gauge symmetry is broken down to the Standard Model gauge group by a domain wall configuration. Matters are localized around the domain walls by the so-called Jackiew-Rebbi mechanism while the gauge fields are localized by the non-minimal coupling between the gauge fields and...
Curvaton mechanism provides an alternative way to explain the origin of the observed primordial scalar fluctuations in the Cosmic Microwave Background (CMB) radiation. In this scenario, the curvaton is a scalar field which nearly remains frozen during inflation but produces isocurvature perturbations. It starts to evolve after the end of inflation, and at the time of it's decay it converts the...
We study the discovery prospects of leptophilic dark matter (DM) in future lepton colliders by considering the light neutrinos to be of Dirac type. Adopting an effective field theory (EFT) approach, we write down dimension six operators connecting the standard model (SM) fields, light Dirac neutrinos and DM. Considering DM relic to be generated via the thermal freeze-out, we check the...
Experimental
Hidden sectors can give rise to novel dynamics in the early universe, and correlated signatures in experiments today. I will discuss some examples of thermal and non-thermal hidden sectors that can account for dark matter and/or the baryon asymmetry, and present new results and prospects for experimental searches that improve our sensitivity to these hidden sectors.
We study thermal and non-thermal resonant leptogenesis in a general setting where a heavy scalar $\phi$ decays to right-handed neutrinos (RHNs) whose further out-of-equilibrium decay generates the required lepton asymmetry. Domination of the energy budget of the Universe by the $\phi$ or the RHNs alters the evolution history of the primordial gravitational waves (PGW) of inflationary origin,...
Dark Matter (DM) has become one of the major shortcomings of Standard Model (SM) of Particle Physics. We consider a model independent approach to search for Dark Matter in the context of HL-LHC (High Luminosity Large Hadron Collider) where our DM candidate is a Dirac-like fermion. In this analysis, we present the effect of one dimension-6 and two dimension-7 effective opertors who are...
The vGeN experiment is performed at the Kalinin Nuclear Power Plant at a distance of 11 m from the center of the reactor core. The goals of the experiment include observation of coherent elastic scattering of reactor antineutrinos off nuclei (CEvNS) and search for the magnetic moment of antineutrino (NMM) using a 1.4 kg low-threshold germanium detector. Based on the data from September 2022 to...
We propose an experiment focused on designing and developing a liquid organic scintillation detector, along with its characterization using a photomultiplier tube for scintillation counting and high-energy particle detection. The experiment aims to optimize conditions for long-term stability, low background noise, high gain, and a high signal-to-noise ratio. We will also examine the system's...
The phenomenology community has extensively investigated the extreme conditions of matter within fermionic dark matter (FDM) admixed neutron stars using various effective field theories. A popular model in this context is hereby referred to as the σ − ω − ρ + FDM model, which incorporates fermionic dark matter interacting with baryonic matter through new scalar and vector mediators. However,...
The sources of high-energy astrophysical neutrino events are still unknown. We searched sources at an angular separation of 3 degrees from the neutrino event positions. out of 340 high energy astrophysical neutrinos, 262 were found to coincide with the positions of the blazar sources. The coincident number of blazar sources is 460. Nine of these sources had a maximum of four neutrino events...
For scattering cross sections large enough to make the detector in direct searches optically thick to
the incident dark matter, dedicated multi-scatter signatures are being sought. We provide some sig-
nificant updates to the multi-scatter program. First, we refine earlier treatments of the dark matter
flux through detectors, generalizing to arbitrary geometries and velocity distributions....
