The vGeN experiment is aimed to study coherent elastic neutrino-nucleus scattering and search for neutrino electromagnetic properties. The vGeN experimental setup is located at a distance of 11 meters from the center of reactor core of Kalinin Nuclear Power Plant Unit#3. The data is taken with the high-purity germanium detector with a mass of 1.4 kg. The sensitivity of the vGeN experiment to...
Dynamics of gravity interaction with matter at one-loop level of effective quantum field theory naturally sets the cut-off scale $\Lambda_E$ in a sub-Planckian region through incorporating the gauge coupling constant $\alpha(\Lambda_E)$ and the reduced Planckian mass $\tilde m_\textsc{pl}$ into relation $ \Lambda_E\sim \tilde m_\textsc{pl}\,\alpha(\Lambda_E)/(4\pi)$ numerically yielding...
Dirac dark matter (DM) fermions $\chi$ can arise within the framework of Composite Higgs Models (CHMs). In such scenarios, the DM candidate is a composite neutral fermion emerging from a strongly-coupled sector. This strongly-coupled dynamics could also result in a light Higgs boson, which arises as a composite pseudo-Nambu-Goldstone boson (pNGB)โin direct analogy to pions in QCD.
We focus...
The determination of inclusive $|V_{cb}|$ from $b\to c \ell \nu$ decays relies on the Heavy Quark Expansion (HQE) involving coefficients and associated non-perturbative matrix elements, which can be expressed in terms of a number of expansion parameters. The moments of the kinematic distribution such as dilpeton mass $q^2$ or hadronic part mass $M_{X_c}$ of the decay can be computed in a...
T2K is a long-baseline neutrino oscillation experiment. Its primary goals are to test CP symmetry in the lepton sector and precisely measure oscillation parameters, such as $\theta_{23}$ and $\Delta m_{32}^{2}$. The experiment's near detector complex ND280 was recently upgraded and now includes a new highly-segmented scintillator detector, SuperFGD.
We present a study of the ND280 near...
The presence of New Physics contribution to loop diagram-induced $b \to s \bar{s} s$ transitions can lead to a noticeable direct $CP$ violation in $B^+ \to K^+ K^+ K^-$ if not only the weak but also the strong phase of the New Physics are different from the Standard Model phase. We show that by using a resonance in the $K^+ K^-$ system from the tree diagram $b \to c \bar{c} s$, for example...
The formfactors in 2d sine-Gordon (SG) model were studied using the free field representation in reflectionless points; based on the work of Lukyanov [1], we found the formfactors of the exponential operators $e^{ia\phi}$ and of their descendants $\partial^n \bar{\partial}^m e^{ia\phi}$ in the form of finite sums. We showed that the formfactors are factorized into thr product of universal...
Associated multiple charmonia production in high energy proton collision has great significance for the research in QCD and the mechanism of charmonium production. In this study, data collected at CMS Run 2 in 2018 is utilized in measuring the integrated and differential cross-section and the fraction of DPS in $J/\psi-\psi(2S)$ associated production. Acceptance and efficiency corrections are...
The vGeN experiment located at the Kalinin Nuclear Power Plant aims to measure coherent elastic neutrino nucleus scattering (CEvNS) cross section off germanium nuclei and search for neutrino electromagnetic properties. The results of CEvNS search on part of the vGeN statistics are presented. The influence of reactorย antineutrino energy spectrum and quenching-factor models uncertainties on the...
Measurements of $\Delta A_{CP} = A_{CP} (D^{0} \to K^{+}K^{-})~ - ~ A_{CP} (D^{0} \to \pi^{+}\pi^{-})$ and $A_{CP} (D^{0} \to K^{0}_{S}K^{0}_{S})$ are reported. The analyses are made using pp collision data collected by the CMS experiment at the LHC in pp collisions with center-of-mass energy of 13 and 13.6 TeV. Robust trigger strategy along with novel semileptonic flavor tagging method...
By solving Ward identities of matrix models one can obtain their representation as generating functions of matrix elements of two-dimensional conformal theories --- conformal matrix models. Ward identities of one-matrix model --- Virasoro constraints, are solved in terms of free boson correlators. Zamolodchikov' W-algebras appear as the main constituent of multi-matrix models Ward identities...
In this work the study of the $e^+e^- โ K^+K^-\pi^+\pi^-$ process in the center-of-mass energy range from 1.4 to 2 GeV is presented. The data collected with the CMD-3 detector at the VEPP-2000 collider at 82 center-of-mass energy points have been used. Their integrated luminosity has amounted to about 500 $pb^{-1}$. The $e^+e^- โ K^+K^-\pi^+\pi^-$ cross section has been measured, and the...
In the report, the off-shell electromagnetic pion form factors in the Bethe-Salpeter formalism are considered. The separable kernel of the first rank quark-antiquark interaction is used to solve the equation analytically. The half-off-shell pion form factors $F_1$ and $F_2$, which are related to each other by the Ward-Takahashi identity, are calculated. The obtained off-shell form factors as...
Short-Range Correlations (SRC) are specific type of local density fluctuations within nucleus formed by two nucleons coming as close to each other as a nucleon radius. At this moment the momenta of both paired nucleons are opposite and higher than the Fermi momentum. In JINR the second SRC experiment at BM@N took data in 2022. The hard quasi-free scattering reactions 12C(p, 2p)11B/10B/10Be...
Data collected by the CMS experiment at the Large Hadron Collider have been analyzed to study the decays of the $\Omega_b^-$ baryon. More than 250 $\Omega_b^- \to \Omega^- J/\psi$ decay events were reconstructed using proton-proton collision data recorded during Run 2 (2016โ2018) and Run 3 (2022โ2024) at center-of-mass energies of โs = 13 TeV and โs = 13.6 TeV, with integrated luminosities of...
$BB$ pairs from $\Upsilon(4S)\to BB$ decays are in $C$-odd state. However, there is a small admixture of the $C$-even state and it modifies the time dependent $CP$-asymmetry. The $C$-even component appears due to soft photon emission, breaking the pure $C$-odd nature of the initial state. Using the two-particle wave function formalism, we derive analytical expressions for $CP$-asymmetry in...
The primary goal of the DANSS (Detector of AntiNeutrino based on Solid Scintillator) experiment is to search for neutrino oscillations into a hypothetical sterile state. Currently, the experiment provides the world's best model-independent limits for searching for sterile neutrinos in the range of $ฮ๐^2_{14}$ โผ 1 eV$^2$, $sin^2 2๐_{๐๐} < 0.01$. Achieving goals of the experiment requires...
We study hydrodynamic effects in the measurements of bulk properties of the matter produced in Au+Au collisions at $\sqrt{s_{NN}}=7.7$ GeV using identified hadrons ($\pi^{\pm}$, $K^{\pm}$ , $\bar{p}$ and $p$) with AMPT, EPOS4, SMASH and PYTHIA8 models. Midrapidity ($|y|<0.1$) results for invariant particle yield, average transverse momenta and particle ratios, in dependence of various...
The electromagnetic form factors (EMFFs) $G_E$ and $G_M$ of hadrons are fundamental quantities for probing the internal structure of hadrons and understanding the perturbative and nonperturbative quantum chromodynamics(QCD) effects encoded in hadrons. They contain the
information about the distribution of electric charge and magnetic moment of the hadron.
In the present work, we...
One of the main interests of high-energy physics is the study of the phase diagram and the localization of phase transitions from hadronic to quarkโgluonic matter. There are different techniques to study the hot matter. One of them is femtoscopy, which uses two-particle correlations to extract spatiotemporal characteristics of the emission source. Another approach is based on the analysis of...
This study investigates the process of photon decay into an electron-positron pair in an external crossed electromagnetic field. The phenomenon is analyzed using the quasi-classical worldline instanton method.
The system of equations of motion has been solved for this field configuration.
The nature of the solutions has been analyzed depending on the relationship between the E and H fields,...
Tetraquarks with two heavy flavors (charm $c$, bottom $b$) are studied within the relativistic quark model, based on the quasipotential approach and QCD. Tetraquark is treated as a diquark--antidiquark bound state. The interaction potential in the relativistic quasipotential equation contains all spin--dependent and spin--independent relativistic contributions. Finite size of the diquark is...
This work presents the implementation of a prototype compact reactor antineutrino detector. To detect antineutrinos via the inverse beta decay reaction, the detector combines the following components: a hydrogen-rich base, a high-atomic-number (Z) fluoride scintillator, a neutron-capturing additive, and light-collecting elements. The technology is based on several key principles: delayed...
We perform numerical semiclassical calculations of the false vacuum decay probability for a scalar field in the Schwarzschild spacetime. The suppression $F$ of the decay probability $P \sim e^{-F}$ is given as a functional of a semiclassical solution. That solution is defined on a certain contour in complex time. We consider a model with potential $V(\phi)= m^2 \phi^2 / 2 + m \sqrt{\lambda}...
Recent data releases from the Dark Energy Spectroscopic Instrument (DESI) survey produce very strong upper constraints on the sum of neutrino masses ($\sum m_{\nu}$), putting cosmology in tension with ground-based experiments, especially in the case of inverse mass hierarchy. However, these constraints still heavily depend on the baseline CMB dataset used to calibrate DESI measurements. We...
The reconstruction of final state is studied for the process e+e-->ZH (Z->qqbar, H->bbbar) at the center of mass energy 240 GeV. The signal samples were simulated in the ILD detector model and reconstructed with particle flow technique. Several applicable jet clustering algorithms from the FastJet package have been tested. An approach based on complementarity of the recoil and direct...
We evaluate the experimental sensitivity to the $CP$-odd admixture in the standard Higgs
boson for the process $e^+e^-\to HZ$. The analysis is performed assuming the future lepton collider CEPC reference
detector operating at $\sqrt{s}=240~\text{GeV}$ with statistics of $5.6~\text{ab}^{-1}$.
Using the \footnotesize WHIZARD \normalsize
generator with the Higgs Characterisation model and...
The Multipurpose Detector of Muons (MDM) has been developed at MEPhI. The setup consists of four layers of multiwire drift chambers and two steel absorber layers with thickness of 100 mm and 200 mm each. This configuration enables registration and analysis of both single-particle and multi-particle events within a zenith-angle range of 0ยฐโ 60ยฐ.
The detector is designed to investigate the flux...
It has been shown that the non-Abelian vortex string in 4D N=2 supersymmetric QCD (SQCD) with the U(2) gauge group and 4 flavors becomes a critical superstring. Its 10D target space is a product of the flat 4D space and an internal noncompact Calabi-Yau threefold, namely, the conifold. It was also shown that the Coulomb branch of the associated string sigma model, which opens up at strong...
I will present an inclusive study of $B^+\!\to K^+ X_{c\bar c}$ and $B^+\!\to \bar D^{(*)0}\pi^+$ using $778~\mathrm{fb}^{-1}$ of Belle data and $362~\mathrm{fb}^{-1}$ of Belle~II data at $\sqrt{s}=10.58~\mathrm{GeV}$. The main goal is to measure the inclusive branching-fraction ratio $R_{X/J/\psi} = \mathcal{B}(B^+\!\to K^+ X(3872)) / \mathcal{B}(B^+\!\to K^+ J/\psi)$, where many systematics...
We discuss the problem of discriminating between photon and hadron-induced extensive air showers (EAS), the difficulties of training a classifier on Monte-Carlo simulations and then applying it to the real world data. We propose to use domain adaptation techniques for aligning the feature distributions of Monte-Carlo and experimental data and thus increasing the reliability of classification.
