The analysis presented studies the production of a Higgs boson via gluon fusion in association with 2 jets with the aim of setting constraints on the CP properties of the top-Yukawa coupling. According to the SM, the Higgs boson must to be a CP even scalar, however some Beyond Standard Model theories predict the existence of the superposition of CP eigenstates, resulting in a CP mixed state....
A measurement of the $ B_{s} \to J/\psi\phi $ decay parameters using 80.5 $ $fb$^{-1} $ of integrated luminosity collected with the ATLAS detector from 13 TeV pp collisions at the LHC is presented. The measured parameters include the CP-violating phase $ϕ_{s}$.
The observation of the $\Lambda_b^0\rightarrow J/\psi\Lambda\phi$ decay is reported using proton-proton collision data collected at $\sqrt{s} = 13$ TeV by the CMS experiment at the LHC in 2018, corresponding to an integrated luminosity of 60 $fb^{-1}$. The ratio of branching fractions $B(\Lambda_b^0\rightarrow J/\psi\Lambda\phi)/B(\Lambda_b^0\rightarrow \psi(2S)\Lambda)$ is measured to be...
The talk is aimed at giving insights from the ongoing research into multiparticle scattering in the real scalar field theory. The object of the research is the unbroken $\lambda \phi^4$ theory in the case of weak coupling. The research aims are to obtain semiclassical suppression exponents for the processes few $ \to N$, where $N$ is a semiclassically large ($\sim 1/\lambda$) final number of...
The study of excited $\Lambda_{\mathrm{b}}^0$ baryons is reported, based on a data sample of $140$\,fb$^{-1}$ collected with the CMS detector in proton-proton collision at centre-of-mass energy of 13 TeV. Existence of four baryon states $\Lambda_{\mathrm{b}}^*(5912)^0$, $\Lambda_{\mathrm{b}}^*(5920)^0$, $\Lambda_{\mathrm{b}}^*(6146)^0$, and $\Lambda_{\mathrm{b}}^*(6152)^0$ is confirmed and...
We consider dark matter represented by the light scalar field whose coupling to the ordinary matter is extremely suppressed. We assume that this interaction can be described as the coupling of the square of the field to the energy-momentum tensor. We study the effect of this interaction on the evolution of dark matter scalar, as well as bounds on the model parameters that come from the...
The $\overline{\text{P}}\text{ANDA}$ experiment at FAIR in Darmstadt (Germany), which is currently under construction, will provide excellent opportunities to search for exotic states in anitproton-proton annihilations. Various experiments observed tensor resonances in the $\phi\phi$ system in the same mass region where Lattice QCD calculations predict the tensor glueball. The determined...
We consider a supersymmetric extension of the Standard Model with a broken supersymmetry. Our model contains the fields of the Minimal Supersymmetric Standard Model and goldstino multiplet, which is present due to the supersymmetric version of the Goldstone theorem. Scalar component of this multiplet is traditionally called sgoldstino. We consider the interval of sgoldstino masses from 260 GeV...
Recent results from a search for the electroweak production of charginos and sleptons decaying into final states with two leptons (electrons and/or muons) are presented on 139 $\text{fb}^{-1}$ proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider at $\sqrt{s} = 13$ TeV. Three different R-parity conserving scenarios, based on simplified models, are considered:...
We present a feasibility study of the muon polarization measurement to extract the Michel parameter $\xi'$ in $\tau$-decays. We suggest as a method using the angular distribution of an electron in the rest frame of a decayed in the drift chamber muon, as electron momentum correlates with muon polarization. The Monte Carlo simulation of the Belle detector with parameters of the Future Super...
$\text{A study of }\Xi_b^- \text{ baryon and its excited state }\Xi_b^{*0} \text{ is reported using proton-proton collisions}$ data sample collected at $\sqrt{s} = 13$ TeV by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of $ 140 \; fb^{-1}$. $\Xi_b^-$ is reconstructed in $J/\psi \Xi^-$ channel $(J/\psi \longrightarrow \mu^+ \mu^-, \Xi^- \longrightarrow...
The subject of the study is the measurement of the properties of the jets selected by the CMS detector in 2016 at a collision energy of 13 TeV with an integrated luminosity of 36 fb^-1. The jets were selected in events with two oppositely directed jets (dijet channel). Three samples of jets were used in the study: from events without additional jets, from events with one or two additional...
The NASA sponsored balloon-borne ANITA detector in Antarctica is designed to detect ultra high energy cosmic rays (UHECR) with energies exceeding 1 EeV ($10^{18}$ eV) by collecting the radio pulse generated through the interaction of the primary particle with Earth’s atmosphere. The radio pulse is detected after reflection from the Antarctic ice surface. For calibration and measurement of...
DANSS is a one cubic meter highly segmented solid scintillator detector. It consists of 2500 scintillator strips, covered with gadolinium loaded reflective coating and read out with SiPMs via wavelength shifting fibers. DANSS is placed under a 3 GW industrial reactor at the Kalinin NPP (Russia) on a movable platform. The distance from the reactor core center is varied from 10.7 m to 12.7 m...
DANSS is a one cubic meter highly segmented solid scintillator detector. It consists of 2500 scintillator strips, covered with gadolinium loaded reflective coating and read out with SiPMs and PMTs via wavelength shifting fibers. DANSS is placed under a 3 GW industrial reactor at the Kalinin NPP (Russia) on a movable platform. The inverse beta decay (IBD) process is used to detect...
Starting with the discovery of the $X(3872)$ in 2003, evidence for many exotic states beyond explanations within the quark model have been found in experiments worldwide. Many of those states are close to thresholds of two combined open-flavor states with convenient quantum numbers, such that the data suggests a treatment as a composite system, namely a hadronic molecule. In the talk, research...
At the end of 2018 the inner subdetectors, SVD (Silicon Vertex Detector) and PXD (Pixel
Detector) were installed in Belle II. By the end of 2019 Belle II has collected a total of 10 fb$^{−1}$. With
the early data taken the charged-particles tracking performance of the detector was characterized,
reconstruction of known resonances and the capability of identifying displaced vertices...
The cross section $ e^+e^- \to \omega\pi^0 \to \pi^+\pi^-2\pi^0 $ is measured in 1 - 2 GeV c. m. energy range using statistics collected by SND detector installed on VEPP-2000 collider in experiments MHAD2011 and MHAD2012 with integrated luminosity $35\text{ pb}^{-1}$. The measured cross section is in the agreement with previous measurements but has better accuracy. $\gamma^*\omega\pi^0$ form...
The ongoing improvement of data of processes such as $B \rightarrow J/\psi ~ \text{K} ~ \pi$ containing $\text{K}\pi$ final state interactions, measured by LHCb or COMPASS, require a theoretically sound description consistent with unitarity and analyticity. The understanding of such meson-meson strong interactions is still unclear and controversial in some energy regions. In particular a lot...
We report preliminary results for the cross section of the $e^+e^- → \eta \gamma$ process measured in the center-of-mass energy range below 1.04 GeV. The data used for the analysis were collected by the SND detector at the VEPP-2000 $e^+e^-$ collider in 2013 and 2018 with the integrated luminosity of 82 pb$^{-1}$. Kinematic reconstruction of events was performed to select the signal process....
To increase the sensitivity for detection of solar neutrinos and
Supernova relic neutrinos by the Cherenkov radiation in the
Hyper-Kamiokande detector it is proposed to use light collectors (mirrors)
surrounding PMTs. The simulation of the light collectors was done. An
increase in the efficiency of neutrino registration for different mirror
shapes and sizes was investigated, as well as...
Accelerator-based neutrino oscillation experiments rely on the description of neutrino interactions with bound nucleons inside atomic nuclei. Neutrino fluxes used in modern experiments (T2K, NOvA) are peaked in the 0.5–5 GeV energy region where one can identify contributions from multiple interaction channels and various nuclear effects. The neutrino-nucleus cross sections in this region are...
In 2018 the CLAS12 detector started data taking with a polarized 10.6 GeV electron beam at Jefferson Laboratory (JLab). One of the quantities which can be extracted from the data is the moment $\mathrm{A_{LU}^{sin(\phi)}}$ corresponding to the polarized electron beam spin asymmetry in semi-inclusive deep inelastic scattering.
$\mathrm{A_{LU}^{sin(\phi)}}$ is a twist-3 quantity that provides...