Moscow International School of Physics 2020

Session

Young Scientist Forum

3 Mar 2020, 17:30

HSE Study Center “Voronovo”

Studying the CP nature of the Top-Yukawa coupling

Federica Pasquali (Nikhef)

03/03/2020, 17:30

Young Scientist Forum

Talk [10+2 min]

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....

Measurement of the CP violation in Bs->Jpsi+Phi decays in ATLAS at 13 TeV

Oleg Meshkov (Lomonosov MSU, P.N. Lebedev Physical Institute)

03/03/2020, 17:42

Young Scientist Forum

Talk [10+2 min]

A measurement of the $B_s\to J/\psi \varphi$ 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 ${\varphi }_s$.

Observation of the Lambda_b -> J/psi Lambda phi decay

Nikita Petrov

03/03/2020, 17:54

Young Scientist Forum

Talk [10+2 min]

The observation of the ${\mathrm{\Lambda }}_b^0\to J/\psi \mathrm{\Lambda }\varphi$ 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 $f{b}^{-1}$. The ratio of branching fractions $B({\mathrm{\Lambda }}_b^0\to J/\psi \mathrm{\Lambda }\varphi )/B({\mathrm{\Lambda }}_b^0\to \psi (2S)\mathrm{\Lambda })$ is measured to be...

Numerical study of multiparticle probabilities in the λϕ4 theory

Mr Bulat Farkhtdinov (MIPT(SU), INR)

03/03/2020, 18:06

Young Scientist Forum

Talk [10+2 min]

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 $\lambda {\varphi }^4$ 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...

Study of excited Lambda_b baryons at the CMS experiment

Sergey Polikarpov (NRNU MEPhI, LPI RAS)

03/03/2020, 18:18

Young Scientist Forum

Talk [10+2 min]

The study of excited ${\mathrm{\Lambda }}_{\mathrm{b}}^0$ 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 ${\mathrm{\Lambda }}_{\mathrm{b}}^{\ast }(5912{)}^0$, ${\mathrm{\Lambda }}_{\mathrm{b}}^{\ast }(5920{)}^0$, ${\mathrm{\Lambda }}_{\mathrm{b}}^{\ast }(6146{)}^0$, and ${\mathrm{\Lambda }}_{\mathrm{b}}^{\ast }(6152{)}^0$ is confirmed and...

Light scalar dark matter coupled to a trace of energy-momentum tensor

Mr Aleksandr Belokon (Institute for Nuclear Research of Russian Academy of Science)

05/03/2020, 17:30

Young Scientist Forum

Talk [10+2 min]

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...

Partial Wave Analysis of pbarp->phiphi at PANDA

Iman Keshk

05/03/2020, 17:42

Young Scientist Forum

Talk [10+2 min]

The $\bar{\text{P}}\text{ANDA}$ 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 $\varphi \varphi$ system in the same mass region where Lattice QCD calculations predict the tensor glueball. The determined...

Light sgoldstinos and Higgs sector in the supersymmetric extension of the Standard Model

Ekaterina Kriukova (MSU, INR RAS)

05/03/2020, 17:54

Young Scientist Forum

Talk [10+2 min]

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...

Search for electroweak production of charginos and sleptons decaying into final states with two leptons and missing transverse momentum at Run 2 with the ATLAS detector

Francesco Giuseppe Gravili (INFN Lecce e Universita del Salento (IT))

05/03/2020, 18:06

Young Scientist Forum

Talk [10+2 min]

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:...

Decays-in-flight muon polarization measurement to extract the Michel parameter ${\xi }^{\prime }$ in $\tau$-decays at the Future Super charm-tau Factory.

Denis Bodrov (Moscow Institute of Physics and Technology (MIPT))

06/03/2020, 17:30

Young Scientist Forum

Talk [10+2 min]

We present a feasibility study of the muon polarization measurement to extract the Michel parameter ${\xi }^{\prime }$ 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...

Study of Xi_b^- signal and its excitations on LHC data

Mr Kirill Ivanov (MIPT)

06/03/2020, 17:42

Young Scientist Forum

Talk [10+2 min]

$\text{A study of }{\mathrm{\Xi }}_b^{-}\text{ baryon and its excited state }{\mathrm{\Xi }}_b^{\ast 0}\text{ is reported using proton-proton collisions}$ data sample collected at $\sqrt{s}=13$ TeV by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of $140f{b}^{-1}$. ${\mathrm{\Xi }}_b^{-}$ is reconstructed in $J/\psi {\mathrm{\Xi }}^{-}$ channel $(J/\psi \longrightarrow \mu^+ \mu^-, \Xi^- \longrightarrow...

Measurement of charged-particle multiplicities in jets and gluon jet fractions for jet samples selected in dijet channel produced in pp-collisions at √𝑠 = 13 TeV with the CMS detector (Run-II)

dzmitry budkouski

06/03/2020, 17:54

Young Scientist Forum

Talk [10+2 min]

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...

Title of the talk : General Treatment of Reflection of Spherical Electromagnetic Waves from the Spherical, Uneven Antarctic Surface and its Implications for the Mystery Events detected by ANITA detector.

Ms Paramita Dasgupta (Senior Research Scholar, Department of Physics at IIT Kanpur India and Visiting Researcher in the Dept. of Physics and Astronomy at University of Kansas, Lawrence)

06/03/2020, 18:06

Young Scientist Forum

Talk [10+2 min]

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...

Statistical data analysis in the DANSS experiment

Nataliya Skrobova (LPI)

08/03/2020, 17:30

Young Scientist Forum

Talk [10+2 min]

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...

Studying of processes caused by stopped muons for the energy scale determination in the DANSS experiment

Alexandra Yakovleva (Moscow Institute of Physics and Technology (State University))

08/03/2020, 17:42

Young Scientist Forum

Talk [10+2 min]

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...

Hadronic molecular binding of $Z_b(10610)$ and $Z_b(10650)$

Simon Leon Krug

08/03/2020, 17:54

Young Scientist Forum

Talk [10+2 min]

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...

Belle II Status and Prospects

Dr Thomas Czank (IPMU)

08/03/2020, 18:06

Young Scientist Forum

Talk [10+2 min]

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...

Measurement of γ*ωπ0 form factor using SND detector on VEPP-2000

Mr V. N. Zhabin (BINP)

08/03/2020, 20:00

Young Scientist Forum

Talk [10+2 min]

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. ${\gamma }^{\ast }\omega {\pi }^0$ form...

Extension of the N/D-method for $\text{K}\pi$ scattering using unitarity, $\chi$PT and resonance exchanges (consistent with chiral symmetry) to energies above 1.4 GeV

Frederic Noel, Leon Alexander von Detten (IAS-4 Forschungszentrum Jülich)

08/03/2020, 20:12

Young Scientist Forum

Talk [10+2 min]

The ongoing improvement of data of processes such as $B\to J/\psi \text{K}\pi$ 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...

Study of the e+e- -> eta gamma process with SND detector on VEPP-2000 e+e- collider

Yana Savchenko

08/03/2020, 20:24

Young Scientist Forum

Talk [10+2 min]

We report preliminary results for the cross section of the $e^{+}{e}^{-}\to \eta \gamma$ 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....

Optimization of the Hyper-Kamiokande detector to increase sensitivity to low-energy neutrinos.

Anastasia Shaykina (INR RAS)

08/03/2020, 20:36

Young Scientist Forum

Talk [10+2 min]

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...

Monte Carlo event generators for neutrino-nucleus scattering in the few-GeV region

Kajetan Niewczas (University of Wrocław / Ghent University)

08/03/2020, 20:48

Young Scientist Forum

Talk [10+2 min]

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...

SIDIS Kaon Beam Spin Asymmetry Measurements with CLAS12

Mr Áron Kripkó (Justus Liebig Universität Gießen)

08/03/2020, 21:00

Young Scientist Forum

Talk [10+2 min]

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 ${\mathrm{A}}_{\mathrm{LU}}^{\sin (\varphi )}$ corresponding to the polarized electron beam spin asymmetry in semi-inclusive deep inelastic scattering.

${\mathrm{A}}_{\mathrm{LU}}^{\sin (\varphi )}$ is a twist-3 quantity that provides...