The analytical formulas describing fiducial cross section of the muon pair production in semi-inclusive proton-proton collision will be provided. The formulas describing correction to the leading photon-photon fusion process due to the photon-Z fusion will be investigated. Numerical results will be obtained. The case of heavy charged particles at higher collision energies which can be reached...
We derive a combined equation system for gravitational and electromagnetic wave propagation in an arbitrary curved space-time and in external magnetic field. After that we solve it numerically in FLRW metric for the upper limit of the intergalactic magnetic field strength, and conclude that the phenomenon of gravitational wave conversion into photons in the intergalactic magnetic field can...
The flavor symmetry-breaking scale in the Froggatt-Nielsen (FN) mechanism is very weakly constrained by present experiments and can lie anywhere between a few TeVs and the Planck scale. We construct two minimal, non-supersymmetric, ultraviolet (UV) complete models that generate the FN mechanism, with a global $U(1)_{\rm{FN}}$ flavor symmetry and a single flavon field. Using the one-loop finite...
The difference between the $C P$ asymmetries in $\mathrm{D}^0 \rightarrow \mathrm{K}_{\mathrm{S}}^0 \mathrm{~K}_{\mathrm{S}}^0$ and $\mathrm{D}^0 \rightarrow \mathrm{K}_{\mathrm{S}}^0 \pi^{+} \pi^{-}$ decays is measured to be $\Delta A_{C P}=(\it{xx.xx} \pm 3.1) \%$. The analysis is performed on the parked data of pp collisions, which were collected by the CMS experiment in 2018 at $\sqrt{s}=$...
We study the phenomenology of the hypothetical vector particles, dark photons. The planned experimental searches for these mediators in the fixed-target experiments, such as SHiP, DUNE and T2K, will mainly focus on the dark photon masses about O(1) GeV. The dominant production mechanism for such 0.5-1.5 GeV dark photons in the proton-proton collisions is the bremsstrahlung $pp\rightarrow...
Recent results of Xi_b baryons spectroscopy studies are reported, using proton-proton colliding beam data from the LHC collected by the CMS experiment at sqrt(s) = 13 TeV in 2016-2018, corresponding to an integrated luminosity of 140 fb-1.
We present the observation of new Xi_b(6100)- baryon, also the observation of new Xi_b- —> psi(2S) Xi- decay and measurement of its branching fraction with...
Using proton-proton collision data corresponding to an integrated luminosity of about $140~\mathrm{fb}^{-1}$ collected by the CMS experiment at $\sqrt{s}= 13~\mathrm{TeV}$ in $2016-2018$, the $\Lambda^{0}_{\mathrm{b}} \to \mathrm{J}/{\psi}\,\Xi^{-}\,\mathrm{K}^{+}$ decay is observed for the first time with a significance exceeding 5 standard deviations. The relative branching fraction, with...
We present first estimates of NICA sensitivity to Standard Model extensions with light hypothetical particles singlet under the known gauge transformations. Our analysis reveals that NICA can explore new regions in the parameter spaces of models with a hidden vector and models with an axion-like particle of masses about 30-500 MeV. Some of these regions seem unreachable by other ongoing and...
The report is devoted to the study of the B0s --> J/Psi Phi Phi decay using the data collected in proton-proton collisions by the CMS experiment from 2016 to 2018 at sqrt(s) = 13 TeV and corresponding to an integrated luminosity of 140 fb {-1}. Intermediate spectra of invariant masses J/Psi phi, phiphi are obtained and the relative probability of the studied decay is measured using the...
$\mbox{CP}$-odd asymmetries in the processes $e^+e^-\rightarrow \tau^+\pi^-\nu_\tau$, $e^+e^-\rightarrow \pi^+\tau^-\bar\nu_ \tau$, $e^+e^-\rightarrow \tau^+\rho^-\nu_\tau$, $e^+e^-\rightarrow \rho^+\tau^-\bar\nu_\tau $, $e^+e^-\to \tau^+e^-\nu_\tau{\bar\nu}_e\,,\,$ and $\,e^+e^-\to \tau^-e^+\nu_e{\bar\nu}_\tau$ are investigated with account for longitudinal polarization of electron (or...
This work presents results of the branching fractions measurements of $J/\psi$ decay into the final states $\pi^+ \pi^-\eta$ and $K^+ K^-\eta$ at KEDR.
KEDR is a universal magnetic detector located at the VEPP-4M collider in Novosibirsk. The current analysis was performed on 5.23 million of $J/\psi$ decays.
The process into $\pi^+ \pi^-\eta$ has been studied through $\rho$ and $\omega$...
We investigate effects of nonzero Dirac and Majorana CP-violating phases on neutrino-antineutrino oscillations in a magnetic field of astrophysical environments. It is shown that in the presence of strong magnetic fields and dense matter, nonzero CP phases can induce new resonances in the oscillations channels $\nu_e \leftrightarrow \bar{\nu}_e$, $\nu_e \leftrightarrow \bar{\nu}_\mu$ and...
We study spatial-temporal structure of quantum fluctuations in stress-energy tensor of zero-point modes of scalar field in order to formulate relativistically covariant model. The model describes a vacuum contribution to cosmological constant in non-stationary state of finite volume. Bare and effective mean values of vacuum energy are compared.
A high statistics of charged kaon decays is obtained by the OKA collaboration. A missing mass analysis is performed in order to search for a signal from light invisible pseudoscalar axion-like particle (ALP) $a$ in the decay $K^{+} \to \pi^{+} \pi^{0} a$. No signal is observed, based on $3.7\cdot10^9$ $K^{+}$ decays, the 90% CL limit on the branching fraction of the decay varies from...
The goal of the work is to describe a spin chain such that, when passing to the scaling
limit, it gives an integrable CFT with Zr symmetry. Then it will be possible to apply to it
the methods of both the BLZ approach and the approach of A. Litvinov and I. Vilkovisky.
To do this, you first need to be able to describe relatively simple models of spin chains
with sl(n) symmetry, that is, such...
Baryon asymmetry problem is one of the most discussed question of the cosmology. Composite Higgs model suggests one of the possible the approaches to the problem within electroweak phase transition. However, the required first order phase is hardly described within perturbative methods. AdS/CFT provides non-perturbative approach to this problem. We estimated the parameters of the first order...
We study discovery potential for the heavy right-handed neutrino exchange contribution in the process $l^{+}l^{-} \rightarrow W^{+}W^{-} \rightarrow 4j~(l = e, \mu)$ at future high-energy lepton colliders. Using the Whizard generator and DELPHES detector simulation framework it is shown that after applying cuts the only non-negligible background process from Standard model is $l^{+}l^{-}...
The current consensus cosmological model, LCDM, is for the most part in good agreement with observations. However, not all is well: as our measurements of both early and modern Universe are becoming more and more precise, a gap opens between different indirect measurements of the Hubble constant, i.e. the rate at which the Universe is expanding today. Many attempts to cross this gap have been...
The experimental foundation of modern neutrino astronomy is designing and scaling of neutrino telescopes which are typically arrays of optical detectors placed in a natural transparent medium (water, ice). The prominent representatives of neutrino telescopes are the IceCube at the South Pole, KM3NeT in the Mediterranean Sea and Baikal-GVD in Lake Baikal. For successful analyses of experimental...
The investigation of theories with a deep connection to experimental physics, such as supersymmetric gauge theories (SUSY QFT) or theories of strongly correlated systems, is of great interest to modern science. One of the most promising and fundamental tools for studying these theories in modern theoretical physics is string theory, thanks to a large number of discoveries made in it. One...
In modern particle physics it is becoming increasingly popular study the b baryons with charmonium-like final states in attempt to find a new tetraquark candidates. Searching such candidates may shed a new light into unclear nature of such states.
Using a data sample collected by the CMS experiment in 2016-2018 and 2022 years, $\Lambda_b^0 \to \psi(2S)\Lambda$ decay was reconstructed, and...
The study of B decays has led to a much better understanding in the flavor sector of the SM. In the CP-violation study, the measurement of sin(2β) has an important role. The “golden channel” B0 → J/ψK0S plays an outstanding role for a clean measurement of sin(2β), where β is one of the angles of the CKM unitarity triangle. The channel B0s → J/ψK0S is related to B0 → J/ψK0S through...
We consider the possibility that the weakly interacting massive particles produced from the evaporation of primordial black hole can explain both the relic density of dark matter and the baryon asymmetry of the Universe, through their annihilation which violate B and CP-symmetry. We find that the primordial black hole with mass less than $10^7 {\rm g}$ is a good candidate as an source of...
In our work, we consider the problem of finding the spectrum of eigenvalues of a random real antisymmetric matrix $J$ with large size $N\gg1$. We study the case of non-zero mean value using the replica method.
This problem is motivated by a $\text{SYK}_2$ model with connections from a Gaussian distribution with non-zero mean.
The $\nu$GeN experiment continues exposition at the Kalinin Nuclear Power Plant aiming for the best reactor-based constraints on the antineutrino magnetic moment and an observation of coherent elastic scattering of antineutrino on germanium nuclei. The background count rate of the HPGe spectrometer in a wide energy range varies with time. This talk presents efforts in understanding and...
The CMS, LHCb, and ATLAS experiments have observed up to three resonances in
the X → J/ψ J/ψ → 4µ decay channel in the invariant mass spectrum between 6 and 8 GeV. These resonances are candidates for ccc¯ c¯ tetra-quark states. In order to study this hypothesis, and to understand the nature of these resonances, we perform a spin-parity study using kinematic distributions of the four muons. A...
