Tracing out degrees of freedom is a standard technique in quantum field theory to isolate the relevant aspects of a system. In this study, we investigate cases where different approaches to tracing out degrees of freedom lead to non-trivial results and implications. Specifically, we consider the vacuum state of a massless scalar field in Minkowski spacetime, partitioned into two Rindler...
A non-classical inflaton which is minimally coupled to the semiclassical theory of gravity in the flat Friedmann-Robertson-Walker (FRW) universe. Using a Coherent Squeezed Vacuum State, we analyzed the validity of the semiclassical theory of gravity by computing density fluctuations in the oscillatory phase of the inflaton. The current study is for density fluctuations of non-classical...
Ultralight Axion Like Particles (ALPs) can mediate a macroscopic force with long-range monopole-dipole interactions between the Earth and the Sun, if the Earth is treated as a polarized source. Due to the geomagnetic field, there exists an estimated $10^{42}$ polarized electrons within the Earth. These electrons, in a polarized state, can interact with the unpolarized nucleons in the Sun,...
Dark matter (DM) is a fascinating subject in Astrophysics and Cosmology. While its exact nature remains elusive, its presence in the universe is inferred through various observational evidences such as galaxy rotation curves, velocity dispersions, gravitational lensing etc. Dark matter halos develop in the universe and subsequently facilitate galaxy formation by accumulating protons. Neutron...
We investigate different classes of models, in which the dark matter candidate arises as a hadronic state of dark constituent quarks, which are charged under both the new confining dark gauge group and the standard model. Specifically, we focus on the case of quarks in the fundamental representation of SU(N), which are heavier than the dark QCD confinement scale. Recent literature has...
In this study, we explore the impact of texture zero on the neutrino mass matrix, focusing on their ability to constrain unknown parameters such as mixing angles, Dirac and Majorana phases, and mass eigenstates. We investigate one-zero texture within the framework of generalized CP symmetry associated with the complex tribimaximal matrix. By combining these approaches, we derive predictive...
The Hyper-Kamiokande (Hyper-K) is a next-generation long baseline neutrino experiment. One of its primary physics goals is to measure neutrino oscillation parameters precisely, including CP-asymmetry measurement. As the conventional νµ beam from the J-PARC neutrino production baseline contains only 1.5% of the electron neutrino interaction of the total, it is very challenging to measure...
We present preliminary results from a search for the decay $B^+ \to K^{*+}\omega$ using the data collected by the Belle and Belle II detector at the SuperKEKB asymmetric-energy $e^+e^-$ collider, operating at the $\Upsilon(4S)$ resonance. This analysis focuses on the decay of $B$ meson into two non-leptonic charmless vector mesons. The production of vector mesons in different polarization...
The production cross sections of the Standard Model Higgs boson decaying into a pair of W bosons have been measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The analysis targets Higgs bosons produced through gluon-gluon fusion, vector boson fusion, and in association with a vector boson. Candidate events were selected based on the presence of at least two charged...
In this work, we study the collective impact of non-standard interactions (NSIs) and environmental decoherence on different neutrino oscillation channels at DUNE experiment. DUNE is a long baseline neutrino oscillation experiment of 1300km baseline, with broad band beam and advanced particle identification facility favourable to search for new physics (NP) effects. Considering these...
We investigate two most popular beyond standard Model scenarios explaining neutrino mass and dark matter. These scenarios can potentially explain the first order phase transitions, which is required for electroweak baryogenesis. The first scenario is Type-II seesaw, and we show that perturbative constraints can be strong enough to rule out most of the parameters for the first order phase...
The $SU(2)_L$ triplet scalar extension of the Standard Model offers interesting collider phenomenology. The minimal extension with custodial symmetry demands one real triplet scalar with a hypercharge quantum number zero, and one complex triplet scalar with a hypercharge quantum number one, in addition to the Standard Model Higgs doublet. This model is dubbed as extended Georgi-Machacek...
Extra dimensions (ED) offer a valuable tool for constructing intricate models and exploring potential new physics phenomena. Our focus is to extand Standard Model (SM) by introducing an U (1) Lµ −Lτ gauge group in the framework of ED, which serves as a compelling initiative aimed at addressing the muon (g - 2) anomaly. In this model, only the Kaluza-Klein (KK) modes of the extra dimensional...
In this work, the Regge trajectories of heavy quarkonia $(c\bar{c}, b\bar{b} \text{ and } b\bar{c})$ are investigated. Using a relativistic model along with a screened confining potential, the spectra of these heavy quarkonia are evaluated. Using the obtained masses, the Regge trajectories are constructed for $(J \rightarrow M^{2})$ and $( n_{r} \rightarrow M^{2})$ planes. The results show...
S-wave mass spectra of $\Xi_{cc}^{++}$ baryon is determined by utilizing a non-relativistic potential model. In this analysis, $\Xi_{cc}^{++}$ is considered as a bound state of $cc$ diquark and a $u$ quark. The central potential considered in this work is a short-range one-gluon coulomb-like potential and a screened confinement potential in the long-range along with the $O(1/m)$ correction...
We present a search for the yet-unobserved B→Dηπ decay at Belle and Belle II. This search aims to provide insights into the semileptonic gap, which refers to the deficit in the sum of the branching fractions of known exclusive decays compared to the measured inclusive b→cℓν branching fraction. Common models addressing this deficit suggest the existence of B→Dηℓν decays with a branching...
Determination of the nature of dark matter and dark sector is one of the most fundamental problems of particle physics and cosmology. This talk presents recent searches for dark matter particles in mono-X final states from the CMS experiment at the Large Hadron Collider and highlights from the recently submitted paper “Dark sector searches with the CMS experiment”. The results are based on...
We present a model-independent study of $c \to d \mu^{+} \nu_{\mu}$ transitions to search new physics in the presence of right-handed neutrinos. We have adopted the effective field theory approach for the low-energy effective Hamiltonian comprising the dimension-six operators. The New Physics Wilson coefficients are determined through a $\chi^2$ fit by using the Miniut package to available...
The existence of non-interacting fermion singlets, known as sterile neutrinos, is contextualized in beyond Standard Model physics. They have become a key element in various scenarios, ranging from explaining oscillation anomalies to accounting for the neutrino mass generation mechanism via the type-I seesaw. Motivated by this, we study a model in which the Standard Model is augmented with...
The resonance state $X(3872)$, also known as $\chi_{c1}(3872)$ was discovered by the Belle collaboration in 2003 in the decay $B^{+} \rightarrow X(3872) K^+$ where $X(3872)\rightarrow J/\psi\pi^+\pi^-$. Still its nature is not well known in spite of a lot of studies carried out on this state. Currently,$X(3872)$ is a strong contender for tetraquark, $D^0\bar{D^{*0}}$molecule, admixture of...
The Large Hadron Collider (LHC) at CERN has a plan to have Oxygen-Oxygen (O+O) collisions at √(S_NN )=7 TeV in the forthcoming run. As the system size of O+O collisions have the final state multiplicity overlap with those produced in Pb+Pb, p+Pb, and pp collisions, it becomes exciting to study thermodynamic quantities using the Color String Percolation Model (CSPM). The thermodynamic...
LHC searches for vector-like quarks have so far only considered their decays into Standard Model particles. However, various new physics scenarios predict additional scalars, allowing vector-like quarks to decay into new channels. These new channels reduce the branching ratios into Standard Model final states, significantly impacting current mass bounds. In this talk, I will review the...
In this work, we study the warm inflation mechanism in the presence of the Barrow holographic dark energy model. Warm inflation differs from other forms of inflation primarily in that it makes the assumption that radiation and inflaton exist and interact throughout the inflationary process. After the warming process, energy moves from the inflaton to the radiation as a result of the...
