I will discuss the state and of high-energy and multi-messenger astrophysics, and consider the exciting prospects for this field moving forward.
On June 29, 2023, the five regional PTAs, including the Indian pulsar timing array (InPTA) announced the evidence for the presence of gravitational waves (GWs) in the nano-Hz frequency regime. This was the first evidence for GWs outside the frequency range of those detected by the ground-based observatories. Currently the international PTA community is gearing towards the analysis of the data...
The Large Hadron Collider beauty (LHCb) experiment has played a pivotal role in advancing our understanding of particle physics, particularly in the study of heavy quarks and their interactions. This talk will present the latest highlights from LHCb, including groundbreaking results in the areas of flavor physics, CP violation, and rare decays. We will discuss recent measurements that...
Whether the neutrino is a Majorana particle, i.e., whether it is its own antiparticle, remains an important open problem in modern physics. The observation of the hypothesized second order weak decay, Neutrinoless Double Beta Decay (0$\nu\beta\beta$) would conclusively establish the Majorana nature of neutrinos. It would also demonstrate lepton number violation and could provide insight into...
The IceCube Neutrino Observatory is a flagship cubic-kilometer neutrino detector made up of transparent, natural Antarctic ice at the South Pole, which is instrumented with digital optical modules to detect Cherenkov light emitted during interactions of neutrinos with energies spanning more than 10 orders of magnitude. It is a unique multidisciplinary facility that has produced several...
Strong first-order phase transitions (SFOPT), a necessary ingredient for the Electroweak Baryogenesis (EWBG) to incorporate the observed baryon asymmetry, can give rise to stochastic Gravitational Waves (GW). Understanding the sources of such primordial waves can complement the collider searches of new physics Beyond the Standard Model (BSM). In this work, we investigate the GW production from...
With detectors at both Fermilab and Ash River, Minnesota, in the United States, NOvA was built to investigate the intricate properties of neutrinos, with a principal emphasis on active three-flavour neutrino mixing phenomena. Comprising two functionally identical detectors, with the Near Detector located 1 km at Fermilab and the Far Detector, located 810 km away and 14 mrad off the beam axis...
The left-handed chiral structure of the W boson in the Standard Model implies that CP violation parameters measured in radiative penguin decays of B mesons should be close to zero due to the suppression of right-handed polarised photon in the final state. Hence these decays are sensitive to physics beyond the standard model through new particles in the loop that can enhance the right-handed...
The Reheating era of inflationary Universe can be parameterized by various parameters like reheating temperature $T_{\text{re}}$, reheating duration $N_{\text{re}}$ and average equation of state parameter $\overline{\omega }_{\text{re}}$, which can be constrained by observationally feasible values of scalar power spectral amplitude and spectral index. In our work, we have done the single...
Mapping the distribution of neutral atomic hydrogen (HI) in the Universe through its 21 cm emission line provides a powerful cosmological probe to map the large-scale structures and shed light on various cosmological phenomena. The Baryon Acoustic Oscillations at low redshifts can potentially be probed by sensitive HI intensity mapping experiments and constrain the properties of dark energy....
We have investigated the non-standard interaction mediated by a scalar field at the upcoming long-baseline neutrino experiments, Protvino to Super-ORCA (P2SO) and Deep Underground Neutrino Experiment (DUNE). Specifically, we have studied the sensitivity of these two experiments to constrain the diagonal Scalar Non-standard interaction (SNSI) parameters $\eta_{ee}$, $\eta_{\mu \mu}$ and...
We analyze the exclusive two-body nonleptonic decays of $B_s^0$ meson to ground as well as radially ecited $2S$ charmonium states and a light meson $K_s$, induced by the $b\to c\bar{c}d$ transition. Within the framework of relativistic independent quark (RIQ) model based on a flavor-independent interaction potential in scalar-vector harmonic form, we calculate the weak form factors from the...
$U(1)$ extension of the Standard Model is well motivated, where the charges of SM fermions are fixed by gauge anomaly cancellations and Yukawa interactions. While the literature extensively discusses anomaly cancellation solutions in which SM fermions are vector-like under new symmetry, allowing the Yukawa structure to remain invariant, chiral solutions in which SM fermions are chiral under...
I'll present the prospect of reconstructing the ''cosmic distance ladder'' of the Universe using our novel deep learning framework called LADDER - Learning Algorithm for Deep Distance Estimation and Reconstruction. LADDER was trained on the apparent magnitude data from the Pantheon Type Ia supernovae compilation, incorporating the full covariance information among data points, to produce...
The rare decays $K \to \pi \nu \bar \nu$ are crucial for exploring physics beyond the Standard Model. Our investigation focuses on these decays in the context of scalar leptoquarks, exploring both lepton flavor conserving and violating channels. Furthermore, we explore the potential to detect lepton number violating operators in $K \to \pi \nu \bar \nu$ decays.
The decay-at-rest of charged kaons produces monoenergetic muon neutrinos with an energy of 236 MeV. The study of these neutrinos at short baselines allows us to constrain new neutrino interactions. In this work, we study kaon decay-at-rest (KDAR) neutrinos at the \jsns experiment where the J-PARC Spallation Neutron Source (JSNS) will produce such types of neutrinos with decay-at-rest processes...
A search is conducted for dark matter pair-production using the Dark Matter simplified model and for graviton production predicted by the ADD large extra dimensions model in a final state with a photon and missing transverse energy in pp collisions at sqrt(s) = 13 TeV. Data taken by the CMS experiment at the CERN LHC in Full Run2, corresponding to an integrated luminosity of 137.2 fb-1, is...
The upcoming long-baseline experiments, like P2SO, DUNE, T2HK, T2HKK, etc. are highly promising experiments concerning the accurate measurement of various neutrino oscillation parameters. At present, we are looking for a tangible explanation for neutrino masses that are not zero, something that the Standard Model cannot provide. The Large Extra Dimension (LED) theory is one of the strong...
Several studies have shown that dark matter halo properties like concentration, triaxiality, and spin play an important role in bar instability dynamics. Building on these insights, we investigated the role of the inner (within the disk region) halo angular momentum distribution on bar formation and evolution processes. We conducted a series of high-resolution N-body simulations of Milky...
In this work we present our analysis of one of the prominent "anomalies" of CMB sky, the "hemispherical power asymmetry (HPA)", from the latest fullsky CMB maps from Planck satellite mission's Public Release 4. The data is analyzed from various perspectives to understand the nature of HPA better viz., a re-estimation of the magnitude and direction of HPA and the corresponding significance,...
The Belle and Belle$~$II experiment have collected samples of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These data have constrained kinematics and low multiplicity, which allow searches for dark sector particles in the mass range from a few MeV to 10~GeV. Latest results are presented.
Various cosmological observations suggest that 85% matter of the Universe is cold dark matter (DM), a non-luminous substance that does not interact with photons and interacts only “weakly” with ordinary matter. Despite no conclusive DM discovery, various experiments, including direct and indirect detection experiments and collider searches, have imposed very tight constraints on its...
Supernova neutrinos are weakly interacting particles which are produced when a massive star collapses to form a compact object losing 99% of the gravitational binding energy of the remnant in the form of neutrinos with energies of a few tens of Mev in a few tens of seconds. Supernova neutrinos have promising potential to address particularly interesting HEP and astrophysics issues , and...
The cosmic web observed in the present universe is an intricate network of galaxies. According to the standard cosmological model, the tiny density fluctuations that existed in the early universe were gravitationally amplified, giving rise to the observable cosmic web or the large-scale structures. To enhance our comprehension of the cosmos and gain valuable insights on galactic evolution it...
In this study, we investigate the new physics effects in semileptonic decay $\bar{B}_s \to K^{*+}(\to K \pi) l^- \bar{\nu}_l$ which is induced by the $b \to u l\nu$ quark level transition. This decay process serves as an important probe for testing the Standard Model predictions and searching deviations that might indicate new physics. The new physics wilson coefficients are constrained by...
In the absence of any new physics signals at the Large Hadron Collider (LHC), anomalous results at low energy experiments have become the subject of increased attention and scrutiny. We focus on three such results from the LSND, MiniBooNE (MB), and ATOMKI experiments. A 17 MeV pseudoscalar mediator ($a'$) can account for the excess events seen in $^8$Be and $^4$He pair creation transitions in...
In this presentattion, we offer the dynamical system analysis of the DBI (Dirac-Born-Infeld) scalar field in a modified f(Q) gravity context. We have taken a polynomial form of modified gravity and used two different kinds of scalar potential, i.e., polynomial and exponential, and found a closed autonomous dynamical system of equations. We have analyzed the fixed points of such a system and...
In this work, we focus on the angular observables such as longitudinal polarization of final leptons, $\tau$-polarization, and forward-backward asymmetry, also including the study of the lepton flavor violating observables, the $\mathcal{R}$ Ratios in the decay channels $B_c \rightarrow \eta_c(J/\psi)\tau \nu_{\tau}$ & $B_c \rightarrow D(D^*)\tau \nu_{\tau}$ in the entire $q^2$ region. Our...
In a dark matter (DM) annihilation process $\chi \bar{\chi} \to f \bar{f} \gamma$ , real photon emission and absorption processes along side with virtual correction $\chi \bar{\chi} \to f \bar{f} $ , contribute to annihilation cross section. We present thermal correction at NLO of annihilation cross section of DM through real photon emission and absorption processes utilizing techniques of...
The IceCube experiment is a 1 km3 neutrino observatory instrumenting an array of Digital Optical Modules (DOMs) deep inside the ice at the South Pole. DeepCore, a densely-spaced subarray of DOMs at the bottom central region of IceCube, enables the detection of atmospheric neutrinos with an energy threshold in the GeV range. With a wide range of energies over a large range of...
The question that what constitutes Dark Matter (DM) is one of the most pressing ones in contemporary physics, and one that has not been answered to any degree so far. Primordial Black Holes (PBHs) are one of the most well-motivated dark matter candidates. PBHs which are light enough that the Hawking radiation is substantial have been constrained by either the non-detection of the radiation...
$\mathbb{Z}_3$ symmetric dark matter models have demonstrated remarkable potential in addressing various (astro-)particle physics challenges. In this presentation, I will discuss the diverse ways in which this model can successfully explain the different cosmological observations. We have considered two such promising models: semi-annihilating dark matter (SADM) and Co-SIMP $2\rightarrow 3$...
The $SU(2)_L\times U(1)_Y$ invariance of the Standard Model Effective Field Theory (SMEFT) predicts multiple restrictions in the space of Wilson coefficients of $U(1)_{em}$ invariant effective lagrangians such as the Low-energy Effective Field Theory (LEFT), used for low-energy flavor-physics observables, or the Higgs Effective Field Theory (HEFT) in unitary gauge, appropriate for...
In the post-reionization universe ($z ≲ 6$), large-scale structure (LSS) is traced by dense, self-shielded clumps of neutral hydrogen (HI) within galaxies. Line-Intensity-Mapping of 21cm is an effective method to probe LSS and constrain cosmology. However, auto-clustering studies of HI are hampered by survey systematics, making HI detection challenging. Cross-correlation analysis between HI...
The information about the mass of Earth and its internal structure has been obtained mainly using gravitational measurements and seismic studies, which depend upon gravitational and electromagnetic interactions, respectively. Neutrinos provide an independent way of exploring the interior of Earth using weak interactions through Earth’s matter effects in neutrino oscillations. Since these...
We study the purely leptonic decays of heavy-flavored charged pseudoscalar (P) and vector (V) mesons ($D_{(s)}^{(*)+}$, $B_{(c)}^{(*)+}$) in the relativistic independent quark (RIQ) model based on an average flavor-independent confining potential in equally mixed scalar-vector harmonic form. We first compute the mass spectra of the ground-state-mesons and fix the model parameters necessary for...
Recently, Tibet AS$_\gamma$ and LHAASO have observed very high energy diffuse gamma rays in the Galactic place between 10 TeV and 1 PeV energies. In our work, we utilize these observations to search for dark matter decay or annihilation signals to Standard Model particles. In addition to the primary gamma-ray originating from various Standard Model particles, we also include secondary...
Conventional searches at the LHC operate under the assumption that Beyond the Standard Model particles undergo immediate decay upon production. However, this assumption lacks inherent a priory justification. This talk delves into the exploration of displaced decay signatures across various collider experiments. Combining insights from several studies, we show how small Yukawa couplings,...
We do a detailed study on vortex formation in a magnetized plasma within the spacetime of a moving cosmic string using analytical and numerical methods. The conical spacetime around the cosmic string causes the frozen-in magnetic field to deform due to the fluid flow. We find that the overdensity in the wake region amplifies the magnetic field. This amplification depends on the direction and...
The decay D → KSKS is among the most interesting modes for the understanding of CP violation in charm decays. It is a singly Cabibbo suppressed transition that involves the interference between cu (bar) → ss (bar) and cu (bar) → dd (bar) amplitudes, mediated by the exchange of a W boson at the tree level, that can generate CP asymmetries at the 1% level, even if the...
The innovative aspect of this study is the introduction of a hybrid scoto-seesaw model based on $A_4$ discrete modular symmetry, which has many intriguing phenomenological implications. Using the type-I seesaw mechanism at the tree level, the scoto-seesaw framework generates one mass square difference $( \Delta m^2_{\rm atm}$). Furthermore, a clear explanation of the two distinct mass square...
The observation of neutrino oscillation means the presence of massive neutrinos in the Standard Model. The well-established framework of standard three-flavor neutrino oscillation sets us for the goal of looking for new physics beyond SM. The heavier neutrino states can decay into lighter ones, first proposed to explain the zenith angle dependence observed in the first data of atmospheric...
The Belle-II has recently presented the evidence for $B^+ \to K^+ \bar{\nu} \nu$ decay for the first time. The result is in excess of the Standard Model prediction and could be a hint for physics beyond the Standard Model. In this work, we explore the implications of the Belle-II results on the $\Lambda_b \to \Lambda^{(\ast)} \nu \bar{\nu}$ decays. We make Standard Model predictions of the...
Magnetic fields in cosmic string wakes generate magnetohydrodynamic shock waves. The reletivistic charged particles in the wake will get accelerated and emit synchrotron radiation. We assume that the overall magnetic field is homogeneous over the width of the wake. Using a one-zone leptonic model, we obtain the sprectrum of synchrotron radiation emitted by these non-thermal relativistic...
The W boson mass and the anomalous magnetic moment of muon are two most notable anomalies that provide a stringent test of the SM and should be explained by any proposed model beyond SM. We shall address these observed discrepancies in a minimal extension of the inert two Higgs doublet model(I2HDM). Using the model parameters constrained by various theoretical considerations and...
We make a correlative study of B-meson anomalies and fermionic dark matter in an extended standard model framework with $U(1)_{L_e-L_\mu}$ gauge symmetry. With three heavy neutral fermions and scalar double leptoquark $\tilde{R}_2$, we realize the $b\to s$ transition. On top, an additional singlet spontaneously breaks the new $U(1)$ and an inert scalar doublet to obtain neutrino mass at one...
At the Large Hadron Collider (LHC), ATLAS and CMS collaborations observed various decay modes of the light charged Higgs bosons produced by top (anti)quark decays. In this talk, I am interested in the subsequent decay of the light charged Higgs boson into a charm and a strange quark-antiquark pair and into a tau and a tau-neutrino pair, separately, in the context of the Georgi-Machacek model,...
Neutrino oscillations can be affected by the presence of Earth-matter through charged and neutral current (NC) interactions, which are mediated by W and Z bosons, respectively. To investigate beyond Standard Model NC interactions, an additional gauge boson ($Z^\prime$) can facilitate interactions between matter and neutrinos. In our study, we investigate a lightweight $Z^\prime$ with a mass...
A well-known method for generating a large blue spectral index for axionic isocurvature perturbations involves a flat direction without a quartic potential term for the axion field's radial partner. In this work, we demonstrate how a large blue spectral index can be achieved even with a quartic potential term linked to the Peccei-Quinn symmetry breaking radial partner. We utilize the fact that...
The natural inflation model with a periodic cosine potential is ruled out by recent Planck 2018 data for the decay constant $f \lesssim 5.5~M_{\rm Pl}$. If the Planck data is combined with the BICEP Keck array and BAO data, the model is excluded (at $2$-$\sigma$) for all values of $f$. In this context, we revisit the model when the pseudoscalar inflation $\phi$ is coupled with a gauge field...
For understanding the hierarchies of fermion masses and mixing, we extend the standard model gauge group with $U(1)_X$ and $Z_N$ symmetry. The field content of the Standard model is augmented by three heavy right-handed neutrinos and two new scalar singlets. $U(1)_X$ charges of different fields are considered after satisfying anomaly cancellation conditions. In this scenario, the fermion...
The Inert Triplet Model (ITM) is a popular scenario with a neutral scalar Dark Matter (DM), along with an inert charged scalar in a compressed mass spectrum. The DM constraints corner the ITM to high TeV-scale mass range, the production of which is inefficient at the present and future iterations of the LHC. However, Vector Boson Fusion (VBF) at a future Muon Collider promises high production...
We propose extension of minimal Scotogenic model with discrete $Z_4$ symmetry. The model is extended with a fermion triplet and a scalar singlet. The Yukawa coupling of triplet fermion with inert doublet gives positive contribution to muon's anomalous magnetic moment. The decay of fermion triplet also generates net lepton asymmetry only in muonic sector due to $Z_4$ charges. Involvement of the...
The framework of three-flavor neutrino oscillation is a well-established phenomenon. However, results from short-baseline experiments, such as the Liquid Scintillator Neutrino Detector (LSND) and MiniBooster Neutrino Experiment (MiniBooNE), suggest the potential existence of an additional light neutrino state characterized by a mass-squared difference of approximately $1,\rm eV^2$. This...
Recent results on the rare b → sll decays are presented by the CMS experiment at 13 TeV. The individual branching fraction results of B± → K±μ+μ− and B± → K±e+e− decays are shown along with the lepton flavor universality (LFU). The effective lifetime of B0s → J/ψK0S decay is discussed. Finally, the CP averaged (Fl) and CP Asymmetry (A6) angular observables of Bs0 to phi mu mu decay is...
The Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) features a sophisticated two-level triggering system composed of the Level 1 (L1), instrumented by custom-design hardware boards, and the High-Level software based trigger (HLT). The CMS L1 Trigger receives information from calorimeters and muon detectors. Recently, a new system, called CICADA (Calorimeter Image...
Magnetic reconnection in the magnetized wakes of cosmic strings results in the release of a large amount of energy. This energy is released in a short period of time. In this work, we show that this sudden release of energy can result in a Gamma-Ray Burst (GRBs) of short duration. Since the magnetic reconnection occurs due to the shock collisions in the cosmic string wake, we use a modified...
In this talk, I will present a minimal model for cosmological selection of the electroweak scale that can resolve the hierarchy problem. Our model consists of a Pseudo Nambu Goldstone Boson (PNGB) and an extra Higgs doublet along with the Standard Model, with a cutoff that can be taken almost as high as the Planck scale. We consider a landscape of vacua with varying Higgs sector parameters. In...
One of the recently proposed machine learning techniques in image processing that surpasses (in some cases) the accuracy of a traditional Convolutional Neural network (CNN) is the Vision Transformer. In this technique, one divides an entire image into different patches and then uses a Transformer-like algorithm to understand different features of the image. For the first time, we use this...
We discuss a mechanism in which the masses of the third, second, and first generation charged fermions are generated at tree level, 1-loop, and 2-loop levels, respectively. In this mechanism, loop-generated masses are obtained through fermionic self-energy corrections induced by heavy gauge bosons of a new flavorful $U(1)_F$ symmetry, which have flavor-violating interactions with Standard...
NuMI Off-axis $\nu_e$ Appearance (NOvA) experiment is an on-going long baseline neutrino oscillation experiment. In addition to the $\nu_{\mu}$, $\bar{\nu}_{\mu}$ disappearance events, it analyses the $\nu_e$ and $\bar{\nu}_e$ appearance events within the energy range of $1
Proton decay in six-dimensions orbifolded on T2/Z2 is highly suppressed at tree level. This is because baryon number violating operators containing only the zero mode of bulk fermions must satisfy a selection rule emerging from the remaining symmetry of the orbifold. Here we show that this relation can be evaded with operators made up of Kaluza Klein partners of the Standard Model fermions....
Leptoquarks, hypothesized as particles of scalar or vector nature, interact with both quarks and leptons. Building on recent measurements from $B$ factories, we investigate how leptoquark couplings influence the rare decays of $B$ mesons involving missing energy. We systematically explore all possible scalar and vector leptoquarks that are invariant under the Standard Model gauge group,...
This study investigates the impacts of both finite temperature and strong magnetic field on Anisotropic Deformed Magnetized White Dwarfs within the parameterized γ-metric formalism. We have considered a relativistic free Fermi gas of electrons embedded in strong quantizing magnetic fields and at finite temperatures. Due to the anisotropy in the pressures parallel and perpendicular to the...
The IceCube DeepCore detector, with its denser central arrangement, can detect sub-GeV atmospheric neutrinos. The oscillation pattern of neutrinos is altered due to interactions with ambient matter as they travel. The changes in these patterns are influenced by the amount of matter and its specific arrangement. As neutrinos propagate, they retain information about the densities they encounter....
In the Type-I 2HDM, all the five new physical Higgs states can be fairly light, $\mathcal O$(100) GeV or less, without conflicting with current data from the direct Higgs boson searches and the B-physics measurements. In this talk, I will discuss how the new neutral and the charged Higgs bosons of the model can be simultaneously observable in the $multi-b$ final state, resulting from the...
The discovery of non-zero θ13 has opened an exciting opportunity for probing the Earth's matter effect in three-flavor neutrino oscillations. This phenomenon depends upon the energy of neutrinos and the density distribution of electrons they encounter during their propagation. It holds significant relevance for advancing our understanding regarding neutrino mass ordering, complementary and...
The Belle and Belle$~$II experiments have collected a 1.1$~$ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to search for rare $B$ meson decays proceeding via electroweak and radiative penguin processes. Results include those of the decay $B\to...
The search for dark matter is performed in association with a Higgs boson decaying into a pair of tau leptons and significant missing transverse momentum in proton-proton collisions data of CMS detector at CERN LHC at a center-of-mass energy of 13 TeV. The results are interpreted in the framework of the 2HDM+a model and baryonic Z’ model by using data collected by the CMS experiment during Run-2.
Numerous observations on astrophysical and cosmological scales can be interpreted to mean that, in addition to the familiar kind of matter well described by the standard model of elementary particle physics, there exists Dark Matter (DM). The fundamental properties of the elementary particles which make up the DM e.g. particle mass, spin, couplings etc are currently being observationally...
NOvA, is a two-detector, long-baseline neutrino oscillation experiment located at Fermilab, Batavia, IL, USA. It aims to constrain neutrino oscillation parameters by analyzing $\nu_\mu (\bar{\nu}_\mu)$ disappearance and $\nu_e (\bar{\nu}_e)$ appearance data. The experiment uses the Neutrinos at Main Injector (NuMI) beamline at Fermilab, which delivers a high-purity 900 KW beam of neutrinos...
The Yukawa coupling of the Higgs boson to the top quark is a pivotal parameter in the Standard Model, providing insights into fundamental particle interactions. This coupling is investigated through the production processes of Higgs bosons in association with top quarks, including tH and ttH. Utilizing proton-proton collision data at a centre-of-mass energy of 13 TeV, this study encompasses an...
Recently, Pulsar Timing Array (PTA) collaborations around the world have found evidence for a stochastic gravitational waves (GWs) background at the nanohertz frequencies. One of the possible sources for these low-frequency GWs are the supermassive black hole binaries (SMBHBs). Despite having several hundreds of SMBHB candidates, none of them are confirmed till date. In 2022, Ning Jiang et....
We study the phenomenology of a vector dark matter (VDM) in a U(1)X gauged extension of the Standard Model (SM) which is connected to the type II seesaw framework via the Higgs portal. When this U(1)X symmetry is spontaneously broken by the vacuum expectation value (VEV) of a complex scalar singlet, the gauge boson Z′ becomes massive. The stability of the dark matter (DM) is ensured by the...
Composite Higgs models provide a promising way to address both the hierarchy problem and the heavy top quark mass. I will discuss a class of models involving a new strongly coupled confining gauge theory, which lead to dynamical electroweak symmetry breaking by generating a composite pseudo-Nambu-Goldstone Higgs boson and a partially composite top quark. I will emphasize the pivotal role of...
The neutrino floor is a theoretical lower limit on dark matter-nucleon scattering cross-section computed in WIMP-like dark matter models that are being probed in direct detection experiments. Neutrino floor, which defines the extent of the neutrino background, can be modified in a BSM set up that is important from the DM detection perspective. We work in a BSM set up which is very natural like...
In the current precision era of neutrino physics, the subdominant new physics scenarios, such as non-standard interactions (NSIs) are of great interest for exploring physics beyond the standard model (BSM). Scalar NSI (SNSI), which is mediated by a scalar field, has been a fascinating area of study in recent times. Unlike vector NSI, SNSI modifies the standard neutrino mass matrix through...
Pulsar timing array experiments (PTAs) aim to detect ultra-low-frequency (∼1–100 nHz) gravitational waves (GWs) by monitoring an ensemble of millisecond pulsars (MSPs) distributed across the Galaxy. The intrinsic wander of the rotation rate of the constituent pulsars, variations in dispersion measure (DM), scatter-broadening, and instrumental noise of radio telescopes often correlate with the...
Primordial black holes (PBHs) in the mass range $10^{-16}-10^{-11}~M_\odot$ may constitute all the dark matter.
We show that gravitational microlensing of bright x-ray pulsars provide the most robust and immediately implementable opportunity to uncover PBH dark matter in this mass window.
As proofs of concept, we show that the currently operational NICER telescope can probe this window near...
A minimally extended version of the Standard Model where baryon number is promoted as a gauged $U(1)_B$ symmetry can be made anomaly-free by adding a set of vector-like fermions. Such a scenario can evade the spin-dependent direct detection bounds on vector-like fermions. Additionally, the lightest component of the exotic fermion sector behaves as a viable dark matter candidate. We show that...
In this talk, I will discuss how long-lived particle (LLP) searches using non-pointing photons can be used to probe transition magnetic moments of heavy sterile neutrinos. Active-to-sterile and sterile-to-sterile transition magnetic dipole moments are examined in the Standard Model effective field theory extended with right-handed neutrinos (NRSMEFT) and in a simplified UV-complete scenario....
The most general two-triplet extension of the Standard Model demanding custodial symmetry gives rise to the extended Georgi-Machacek (eGM) model. Via computing one-loop corrections to all $2 \rightarrow 2$ scattering amplitudes in the eGM model, we place NLO unitarity bounds on the quartic couplings. On top of that, we derive stringent conditions on the quartic couplings ensuring there exists...
Dark matter (DM) particles can get captured inside the Sun due to DM-electron interaction. As the number of these captured DM particles increases, they can annihilate and produce different Standard Model (SM) final states. Neutrinos and anti-neutrinos produced from these final states can escape the Sun and reach ground-based neutrino telescopes. The latest data-sets from IceCube and DeepCore...
We investigate the potential for low-scale leptogenesis and WIMP dark matter within the singlet-triplet scotogenic model (STScM). First, we examine the scenario with two heavy right-handed fermion (HRF) fields, $N$ and $\Sigma$, which exhibit a moderate mass hierarchy. In this setup, the out-of-equilibrium decays of both HRFs generate a lepton asymmetry. Our analysis shows that the...
The existence of an early matter-dominated epoch prior to the big bang nucleosynthesis (BBN) may lead to a scenario where thermal dark matter cools faster than the plasma before the onset of reheating. This extra cooling reduces the free-streaming horizon of the dark matter compared to the usual radiation-dominated cosmology. Enhanced matter perturbations for scales entering the horizon before...
The quest for new physics beyond the Standard Model (BSM) remains a cornerstone of contemporary particle physics, driving the pursuit of new particles. We present the recent results from an extensive search for BSM particle states in 'high-mass diphoton events', a signature indicative of various SM extensions such as Supersymmetry, extra dimensions, and non-minimal Higgs sectors.
Searches...
Dark matter(DM) has been studied with consideration of many different symmetries and particle content. But it's detection has stayed as ever illusive. In this talk I will present a work where we considered an addition of vector like quark(VLQ) to a very well known DM model, Inert Doublet Model(IDM). The addition of VLQ not only enrich the freeze out mechanism of IDM dark matter but the also...
Ultraperipheral (UPC) lead-lead collisions produce very large photon fluxes, allowing for the study of fundamental quantum-mechanical processes and serving as a very good probe for physics beyond the standard model (BSM). In this talk, measurements of the light-by-light scattering (LbL, $\gamma\gamma\to\gamma\gamma$) and the Breit--Wheeler (B--W, $\gamma\gamma\to\mathrm{e}^+\mathrm{e}^-$)...
The exact sources of high-energy neutrinos detected by the IceCube neutrino observatory still remain a mystery. For the first time, this work explores the hypothesis that galaxy mergers may serve as sources for these high-energy neutrinos. Galaxy mergers can host very high-energy hadronic and photohadronic processes, which may produce very high-energy neutrinos. We perform an unbinned...
Current ton-scale direct detection experiments have begun observing solar neutrinos. We probe the weak mixing angle using existing direct detection data. Leveraging recent measurements of B solar neutrinos via coherent neutrino-nucleus scattering by PandaX-4T and XENONnT, we demonstrate that these experiments can probe the weak mixing angle in a region complementary to that of dedicated...
Isolated ideal neutron stars (NS) of age $>10^9$ yrs exhaust thermal and rotational energies and cool down to temperatures below $\mathcal{O}(100)$ K. Accretion of particle dark matter (DM) by such NS can heat them up through kinetic and annihilation processes. This increases the NS surface temperature to a maximum of $\sim 2550$ K in the best case scenario. The maximum accretion rate depends...
In the simplest linear seesaw picture the neutrino mass mediators can be accessible to colliders. Novel charged Higgs and heavy neutrino production mechanisms can be sizeable at $e^+ e^-$, $e^- \gamma$, $pp$, or muon colliders. The associated signatures may shed light on the Majorana nature of neutrinos and the significance of lepton number non-conservation.
In neutrino oscillation experiments, it was discovered more than twenty years ago that neutrinos have nonzero masses. Till then the values of two mass-squared differences have been measured with an unprecedented accuracy without revealing the absolute mass scale for neutrinos. On the other hand, the underlying symmetry that can generate the appropriate neutrino-mixing pattern also remains...
The search for magnetic monopoles has intrigued physicists for centuries. The NOvA Far Detector (FD), primarily used for studying neutrino oscillations, possesses a unique potential to search for exotic subluminal particles such as magnetic monopoles. With its extensive surface area of over 4,000 m², its location near the earth's surface, and minimal overburden, the 14 kt FD is highly...
We worked on a model for hybrid neutrino mass generation, wherein scotogenic dark sector particles, including dark matter, are charged non-trivially under the $A_4$ flavor symmetry. The spontaneous breaking of the $A_4$ group to the residual $Z_2$ subgroup results in the “cutting” of the radiative loop. As a consequence the neutrinos acquire mass through the hybrid “scoto-seesaw” mass...
To search for physics beyond the Standard Model at colliders like the Large Hadron Collider (LHC), experimentalists often rely on simple phenomenological models. So far, these searches have not yielded positive results. Nevertheless, there are compelling reasons to believe that new physics should exist at the TeV scale, within the LHC's reach. In this talk, I will demonstrate how one can...
Galaxy clusters could produce gamma rays from inverse Compton scattering of cosmic ray electrons or hadronic interactions of cosmic ray protons with the intracluster medium. It is still an open question on whether gamma-ray emission (> GeV energies) has been detected from galaxy clusters. We carry out a systematic search for gamma-ray emission based on 300 galaxy clusters selected from the...
In neutrino oscillation experiments, heavy nuclear targets are used to increase the number of neutrino interactions and improve statistical accuracy, but this introduces systematic uncertainties due to the complex nuclear environment. The interaction of neutrinos with nuclear targets results in an imprecise neutrino energy reconstruction and cross-sectional uncertainties, which affect the...
We investigate the renormalization-group scale and scheme dependence of the $H \rightarrow gg$ decay rate at the order N$^4$LO in the renormalization-group summed perturbative theory, which employs the summation of all renormalization-group accessible logarithms including the leading and subsequent four sub-leading logarithmic contributions to the full perturbative series expansion. ...
We study the boosted dark matter (BDM) scenario in a two-component model. We consider a neutrinophilic two-Higgs doublet model ($\nu 2$HDM), which comprises of one extra Higgs doublet and a light right-handed neutrino. This model is extended with a light ($\sim 10$ MeV) singlet scalar DM $\phi_3$, which is stabilized under an extra dark $Z_2^{\rm DM}$ symmetry and can only effectively...
The Dirac scotogenic model provides an elegant mechanism which generates small Dirac neutrino masses at the one loop level with a single symmetry, the so-called chiral $U(1)_{B-L}$, simultaneously protecting the ``Diracness'' of the neutrinos, the smallness of their mass and the stability of the dark matter candidate. Despite being chiral, this symmetry is also anomaly-free and thus could be...
The Vera C. Rubin Observatory Legacy Survey of Space and Time (Rubin LSST) is expected to achieve its first system light by late 2025. An initial data preview, drawn from early commissioning phases, is set for 2025-26, exciting the scientific community as they prepare to explore the Rubin LSST data. In this context, we have been working on developing the DESC Time Domain (TD) pipeline with a...
The Belle and Belle II B-factories have collectively gathered an extensive 1.1~ab$^{-1}$ dataset of $e^+ e^-$ collisions at the $\Upsilon(4S)$ resonance, resulting in the production of numerous $B\bar{B}$ pairs. This allows for precise measurements of hadronic $B$ decays, which is essential to test Quantum Chromodynamics (QCD) and refine theoretical models. This also helps improve simulation...
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...
Black Hole is a region of space time where the gravity is strong enough that, there is no predictable connection between the interior and the exterior region. A Kerr black hole can be explained only in terms of mass, spin and angular momentum. LQG is completely non-perturbative, explicit background independent approach to quantum gravity theories. Generally, the application of LQG on cosmology...
Galactic Dark Matter (DM) particles can get captured inside celestial bodies if they have some non-zero but weak interaction with the nucleons. Due to their significant size and lifetime, these celestial bodies can capture huge amounts of DM particles, and eventually, an overly dense dark core is created. This core can further collapse and form a minuscule Balck Hole (BH) that can eat up the...
In this talk, we present a model for the radiative neutrino mass mechanism in which the particles within the loops are characterized by milli-charges. Unlike the conventional scotogenic model, our approach avoids imposing a discrete symmetry or expanding the gauge sector. The minuscule electric charges ensure the stability of the lightest particle within the loop as a viable dark matter...
The first observation of the concurrent production of two $\rm{J}/\psi$ mesons in proton-nucleus collisions will be presented. The analysis is performed using a dataset recorded by the CMS experiment at the LHC with the nucleon-nucleon center-of-mass collision energy at 8.16 TeV. The integrated luminosity is 174.6 $\rm{nb}^{-1}$. The measured inclusive fiducial cross section $\sigma(\rm{pPb}...
Black holes are the current puzzles in modern cosmology. Devoid of concrete knowledge beyond event horizon make them rigid enough not to be soaked by many languages and approaches. However our imagination is inclined towards them to a large extent. Dark energy being an accepted reason for the accelerating universe can be an active factor of most of the phenomenon in the cosmic history. We here...
We discuss the stochastic gravitational wave background emitted from a network of 'quasi-stable' strings (QSS) and its realization in grand unified theories. A symmetry breaking in the early universe produces monopoles that suffer partial inflation. A subsequent symmetry breaking at a lower energy scale creates cosmic strings that are effectively stable against the breaking via Schwinger...
The study of weak radiative decays of charmed mesons is still in its developing stage. The weak decays of $D$ mesons pose challenges due to significant final-state interactions. However, decays mediated by $c \rightarrow u \gamma$ transitions can be affected by potential contributions coming from the non-minimal supersymmetry, which is an new physics scenario. The ratio of branching fractions...
We study the possibility of generating baryon asymmetry of the universe from dark matter (DM) annihilations during non-standard cosmological epochs. Considering the DM to be of weakly interacting massive particle (WIMP) type, the generation of baryon asymmetry via leptogenesis route is studied where WIMP DM annihilation produces a non-zero lepton asymmetry. Adopting a minimal particle physics...
We propose a novel method to determine the mass scale of ambient dark matter that can be generally applied to the (at least effectively) two-dimensional direct detection experiments allowing for directional observables. Due to the motions of the solar system and the Earth relative to the galactic center and the Sun, the dark-matter flux carries a directional preference. We first formulate that...
The Gravitational Wave (GW) interferometers LISA and ET are expected to be functional in the next decade(s). In this talk, I shall discuss about possible synergies between these two detectors, with the aim of a multi-band detection of a cosmological stochastic GW background. I shall illustrate that LISA and ET operating together will have the opportunity to effectively assess the...
Non-commutative geometry as a possible paradigm to understand quantum gravity is gaining more attention in last decades. Non-commutativity of the space-time breaks the Lorentz invariance and one uses Hopf algebra structure to regain consistent particle interpretation. It is thus of importance to study the status of equivalence principle in the non-commutative space- time.
We examine how the...
We study the interrelation among the $B$ decays mediated by $b \to c \ell \nu_{\ell}$, $b \to s \nu _\ell \nu _\ell$ and $b \to s\ell \ell$ ($\ell = e, \mu, \tau$) quark level transitions in the context of six-dimesional SMEFT operators such as $\mathcal{Q}_{\ell q}^{(3)}$,~$\mathcal{Q}_{\ell ed q}$, $\mathcal{Q}_{\ell e qu}^{(1)}$, $\mathcal{Q}_{\ell e qu}^{(3)}$, $\mathcal{Q}_{\phi...
We explore a case of multi-particle dark matter with symmetric and asymmetric dark matter components in a model-independent approach. Starting from the Boltzmann equations for the multi-particle system, we focus on scenarios where one of the DM candidates is hidden from the visible sector. We also comment on the effect of non-standard expansion of the universe on the dark matter relic abundance.
In this article, we attempt to explore the dark sector of the universe i.e. dark matter and dark energy, where the dark energy components are related to the modified $f(Q)$ Lagrangian, particularly a power law function $f(Q) = γ(\frac{Q}{Q_0})^n$, while the dark matter component is described by the Extended Bose-Einstein Condensate (EBEC) equation of state for dark matter, specifically, $p =...
We investigate the flavour and collider phenomenology of the flavon of the novel and unique $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M}$ flavour symmetry, which is capable of addressing the flavour problem of the standard model through the Froggatt-Nielsen (FN) mechanism. In addition to the conventional approach relying on soft-symmetry breaking of the $\mathcal{Z}_{\rm N} \times...
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,...
Gravitational wave memory is a persistent non-oscillatory shift in the gravitational wave amplitude. Such effects are ubiquitous in astrophysical and cosmological cataclysmic events involving gravitational radiation. In this talk, we turn our attention to the case of a supernova neutrino burst generating the gravitational radiation. Previous studies along this line have demonstrated that a...
Primordial black holes with magnetic charges may evade constraints from Hawking radiation, leading to their significant population even for masses below $10^{15} \text{g}$, a range previously considered improbable. They could, therefore, potentially contribute to a component of dark matter in the universe.
This talk will focus on establishing Parker-type bounds on the population...
Interaction between two dark matter (DM) components plays a crucial role in DM production, dynamics and phenomenology in multicomponent DM scenarios. We propose and study a new kind of DM, called pseudo-FIMP (pFIMP), which can be realised in a two-component DM setup. pFIMP is feebly connected to the visible sector but remains in thermal equilibrium by sufficient interaction with a thermal DM...
In the standard cosmological model the universe is assumed to be statistically isotropic & homogeneous when averaged on large scales. The dipole anisotropy of the CMB is ascribed to our peculiar motion due to local inhomogeneity. There should then be a corresponding dipole in the sky map of high redshift sources. Using catalogues of radio galaxies and quasars we find that this expectation is...
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,...
Chameleon dark energy models are a popular alternative to the standard cosmological constant model. These models consist of a new light degree of freedom, called chameleon, with a density dependent mass and a non-trivial coupling to both matter and photons. Owing to these couplings, chameleons can be produced inside the sun. However due to their density dependent mass, the chameleons produced...
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...
How can we decide which cosmological model is the most probable? In a Bayesian approach to statistics, this question can be readily answered using the framework of Bayesian model selection: namely by calculating a model's evidence. However, the numerical evaluation of the evidence can be a numerically difficult task.
I will introduce a new, efficient machine-learning approach to this...
After a brief introduction to neutrino electromagnetic properties, I will focus on the correlation between neutrino magnetic moment and neutrino mass mechanism. Then, I will discuss that the models that induce large neutrino magnetic moments while maintaining their small masses naturally also predict observable shifts in the charged lepton anomalous magnetic moment by showing that the...
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...
Neutrinos are known to have non-zero masses, as shown by oscillation observations, but their absolute mass scale remains unknown. Observational cosmology and neutrinoless double beta decay experiments derive sub-eV upper limits. Complementing these efforts with a model-independent approach based on beta-decay kinematics, the Karlsruhe Tritium Neutrino (KATRIN) experiment provides the most...
We propose a scenario where a heavy RHN DM can be produced by a thermal effect undergoing a resonance at high temperature in the early Universe
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...
Ultralight dark matter can form a core-like structure in the dark matter density profile in astrophysical objects. Neutrinos emerging from these objects might bring out valuable information about this profile through neutrino oscillations if they have interactions with dark matter.
In the absence of a confirmed dark-matter signal in traditional dark-matter search experiments, advances in theory and experiment have opened up various new possibilities of searching for dark-matter particles even lighter than GeV, e.g. boosted dark matter, direct detection with novel materials and sensors, and beam dump experiments. In this talk, I will focus on recent advancements in...
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...
If produced in the early Universe with an initial mass of ∼ 10^15 g, PBHs are expected to evaporate at the present time producing sizable fluxes of particles in their last instants. These “exploding” black holes will emit bursts of Standard Model particles as well as new degrees of freedom, if present. We explore the possibility that HNLs mixing with the active neutrinos are emitted in the...
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...
The GRAPES-3 experiment setup at an altitude of 2200 m in Ooty, India, employs a dense array of plastic scintillator detectors complemented with a large-area tracking muon detector. It is designed to observe shower particles which mostly include gamma rays, electrons and muons produced by interactions of primary cosmic rays and gamma rays in Earth’s atmosphere. Recently, GRAPES-3 successfully...
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...
The coupling of axion and axion-like particles (ALPs) to two photons leads to radiative decays of axion dark matter and axion-photon conversion in an external magnetic field. We discuss two methods to search for these signals exploiting astrophysical data. The first is based on MUSE spectroscopic optical observations of a sample of five classical and ultra-faint dwarf spheroidal galaxies.
We...
In the universal framework of simplified t-channel dark matter models, the relic abundance is dominated by mediator annihilation in most of parameter space, which gets considerably enhanced by the Sommerfeld effect and bound state formation. We provide an intuitive and easy to use add-on package to micrOMEGAs, allowing for an automated inclusion of these effects for a generic t-channel dark...
I will take a brief overview of the recent developments in the field of strongly interacting dark matter. I will discuss new ways to generate dark matter relic density as well as discuss associated detection strategies.
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...
The TEXONO collaboration has been producing world-class results related to reactor neutrinos and dark matter for more than two decades. In this conference, I will discuss the results obtained by the TEXONO experiment based on neutrino-nucleus coherent scattering and will discuss in detail the current status and future plans of the collaboration.
I identify the maximum cross sections probed by single-scatter ``WIMP'' searches in dark matter direct detection. Due to Poisson fluctuations in scatter multiplicity, these ceilings scale logarithmically with mass for heavy dark matter and often lie in regions probed by multiscatter searches. I will present a generalized formula for single-scatter event rates, and use it to recast WIMP...
The Pierre Auger Observatory, the world’s largest cosmic-ray detector, continues to make significant advances in the study of ultra-high-energy cosmic rays (UHECRs). By utilizing a hybrid detection system of surface and fluorescence detectors, the Observatory has made substantial contributions to our understanding of UHECR origins, composition, and energy spectrum, offering a consistent...
In this talk, I would like to investigate the excellent potential of future tau neutrino experiments in probing non-standard interactions and secret interactions of neutrinos. I would like to first discuss so-called secret neutrino interactions of tau neutrinos including their possible effects in cosmology and astroparticle physics. Then, the sensitivities of probing such interactions in...
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...
