V.T. Kim

  (NRC KI PNPI, SPbPU)

High-energy scattering processes within next-to-leading-logarithmic (NLL) BFKL evolution.
  Abstract:
Problems of the next-to-leading-logarithmic Balitsky-Fadin-Kuraev-Lipatov (NLL BFKL) evolution application for high-energy scattering processes are discussed.

Nechiporenko Yu. V.

  (NRC KI PNPI, SPbPU)

Superheavy nuclides and prospects for their study.
  Video
  Abstract:
Superheavy nuclides are exotic objects of nuclear world, and the report reveals interest in their study. The existence of superheavy island of stability is discussed. The possibility of synthesizing such nuclides in the laboratory and their existence in nature is being explored. Experiments on precise mass measurements of superheavy nuclides are considered.New hints of manifestation of BFKL evolution at 2.76 and 7 TeV collision energies are obtained.

A.Yu. Egorov

  (NRC KI PNPI, SPbPU)

Search for the BFKL effects in dijet production with large rapidity separation in pp collisions at LHC energies
  (Presentation)
  Video
  Abstract:
The measurements by the CMS experiment of the set of observables, which are sensitive to possible signals of BFKL evolution, are presented/ The obtained results are compared with Monte Carlo generator predictions and analytical calculations based on both DGLAP and BFKL evolution, respectively. New hints of manifestation of BFKL evolution at 2.76 and 7 TeV collision energies are obtained.

D.V. Fedorov

  (HEPD PNPI)

CERN-MEDICIS: Production of Promising Radionuclides for Nuclear Medicine
  (Presentation)
  Video
  Abstract:
CERN-MEDICIS is the only European facility which dedicates its full program to the production and delivery of medical isotopes for research in radiopharmaceutical science, operating in isotope mass separation mode. The description of CERN-MEDICIS facility and a pilot study of radiopharmaceutical, based on 169Er, produced at CERN-MEDICIS are presented.

P.L. Molkanov

  (HEPD PNPI)

Study of gold isotopes by laser spectroscopy.
  (Presentation)
  Video

V.F. Ezhov

  (PNPI NRC KI, Gatchina)

Neutron lifetime measurements: status and prospects.
  (Presentation)
  Video
  Abstract:
Precision measurements of the neutron lifetime are one of the tests of the standard electroweak model. In combination with measurements of other neutron beta decay correlation coefficients, the neutron lifetime makes it possible to determine the Vud element in the Kabbibo-Kobayashi-Maskawa quark mixing matrix. The neutron lifetime is also one of the key parameters for determining the yield of light elements during nucleosynthesis during the first few minutes of the Universe's existence. Magnetic storage of ultracold neutrons (UCN), in contrast to storage in material traps, allows one to control the loss of neutrons during the measurement of the lifetime of neutrons. It is possible to realize this advantage of the magnetic storage of the UСN only with the help of a magnetic shutter. Without this unique opportunity, experiments with magnetic storage are indistinguishable from experiments with storage in material traps. The problems and systematics in experiments on measuring the lifetime of neutrons using magnetic storage of UСN are discussed.

S.I.Manaenkov

  (HEPD PNPI)

Phenomenology of coherent electroproduction of vector mesons on a spinless target.
  (Presentation)
  Video

Yu. L. Dokshitzer

Gribov Light Quark Confinement Scenario.
  (Presentation)
  Video

A.E.Barzakh

  (HEPD PNPI)

Magnetic moments of nuclei near magic numbers.
  (Presentation)
  Video
  Abstract:
Magnetic moments of Tl isotopes/isomers in the vicinity of the magic number N=126 were measured by in-source laser spectroscopy with LIST technique at ISOLDE. More reliable estimation of the proton gL-factor renormalizaion was obtained. Do the "singular points" in the isotopic behaviour of the magnetic moment point to the direction of the further development of the mean field theories?

N.I.Voropaev

  (HEPD PNPI)

Precision Measurement of Rare and Ultra-Rare Pion decays, Experiment PIONEER.
  (Presentation)
  Video
  Abstract:
PIONEER is a new generation rare and ultra-rare pion decay experiment. The aim is a precision measurement of pion decays with appearance of positron. The experiment is motivated by several data pointing towards the violation of lepton flavor universality.

G.I. Rubtsov

  (INR RAS)

Problems and challenges of ultrahigh energy cosmic ray physics.
  (Presentation)
  Video
  Abstract:
We present an overview of actual problems and recent scientific results in the physics of the ultrahigh energy cosmic rays (above 10^18 eV). The author of the report is a member of the Telescope Array collaboration (TA), the largest cosmic ray observatory in the Northern Hemisphere. TA and the Pierre Auger experiment in the Southern Hemisphere have collected unprecedented event statistics, which allows us to come close to solving the problem of the origin of cosmic rays at the highest energies. The latest results on the anisotropy, chemical composition, and energy spectrum of cosmic rays, as well as the results of a search for ultrahigh energy neutral particles (photons and neutrinos) are presented. The results on the anisotropy of cosmic rays are considered in the context of the search for sources. A description of the state of research on the problem of muon excess in extensive air showers is given. The interdisciplinary results of the Telescope Array experiment related to the physics of thunderstorms are discussed.

A.B. Gridnev

  (HEPD PNPI)

Can the X17 boson be a hadron.
  Abstract-2:
Data on pion-nucleon elastic scattering contradict the hypothesis that the X17 boson is a hadron.

S.G. Barsov

  (HEPD PNPI)

Anomaly of internal pair conversion ( X17 ). New measurements in the Atomki and other planned experiments.
  (Presentation)
  Video
  Abstract-1:
New evidences for the anomaly of internal pair conversion found in He-4 and C-12 by group from Atomki (Debrecen, Hungary) to be in agreement with existence of a hypothetical X17 particle (see also M.B.Ghalov, HEPD seminar, 20.06.2017) are presented. Taking into account that none of experiment directly searching for a light boson production confirm X17 so far, a number of experiments aimed to check the Atomki results are under preparation around the world.

S.A. Eliseev

  (M. Plank Institute, Heidelberg, Germany)

Penning traps for fundamental physics by the example of SHIPTRAP and PENTATRAP.
  Abstract:
High-precision Penning trap mass spectrometry is the most precise technique employed to measure masses of nuclides with half-lives as short as a few ten ms. Currently, there are about a dozen high- precision Penning-trap mass spectrometers located in North America and Europe. The majority of them are part of various Rare Ion Beam (RIB) facilities and aim at measurements of masses of short-lived nuclides with fractional uncertainties down to 10-9. The other group encompasses four ultra-precise Penning trap mass spectrometers. Their major goal are mass-ratio measurements on long-lived and stable nuclides with fractional uncertainties of as small as a few ppt.
   In my talk I will make you acquainted with Penning-trap mass spectrometry by the example of two facilities – SHIPTRAP and PENTATRAP. The focus of the talk will be laid on PENTATRAP. It aims to perform mass- ratio measurements on a very broad range of long-lived nuclides to assist, e.g., experiments on the determination of the neutrino mass, on the search for the fifth force, on the investigation of atomic metastable states that can be suitable ion clock transitions and so on. I will present latest achievements and future plans with PENTATRAP.

V.A. Murzin

  (NRC KI - PNPI)

Searches for heavy resonances by CMS.
  (Presentation)
  Abstract:
An overview of the recent results on search for heavy resonances by the CMS collaboration at LHC.

A.V. Ivanchik, corr. member of the RAS

  (Ioffe Institute)

Neutrino astrophysics. Cosmological neutrinos.
  Video
  Abstract:
Being the most mysterious particle of the Standard Model, the neutrino has also opened up new possibilities in astrophysics. Thanks to neutrinos, a new view of the Universe is emerging. The high penetrating power of neutrinos make it possible to see the interiors of stars, to investigate the mechanisms of the emergence of ultrahigh-energy cosmic rays in the active nuclei of galaxies. When a star explodes, a neutrino flash informs us about this event several hours before electromagnetic radiation. The neutrino also plays one of the key roles in cosmology, being one of the known most abundant particles in the Universe. Neutrinos at the radiation-dominated stage together with photons determine the dynamics of the expansion of the Universe. Later, becoming nonrelativistic, the neutrino increases the fraction of nonrelativistic matter Ωm in the Universe, which previously consisted of contributions from cold dark matter and baryonic matter. The fact that neutrinos influence the evolution of the Universe requires to accounting for it when determining the cosmological parameters from the analysis of the anisotropy of the CMB. At present, there are no doubts about the existence of cosmological neutrinos, but, unfortunately, due to the smallness of their energies, it has not yet been possible to register them directly. However, there are already projects for such experiments, and if we manage to register cosmological neutrinos in the future, then we will directly see the first minutes and hours of the evolution of the Universe after its birth.

M.D. Seliverstov

  (NRC KI - PNPI)

Investigation of processes of effusion, surface and laser ionization in the proposed Target - Ion Source Unit for the IRINA facility.
  (Presentation)
  Video
  Abstract:
Processes of the effusion and ionization (laser and surface) in the Target - Ion Source (for the IRINA facility project) were investigated using Monte Carlo method. Estimations were made for the release time of atoms and ions, and laser ionization efficiency (including possible recombination and re-ionization).

I.I. Strakovsky

  (GWU)

Threshold vector meson photoproduction: from omega to upsilon.
  (Presentation)
  Video
  Abstract:
High-accuracy ϒ-meson photoproduction data from EIC and EicC experiments will allow the measurement of the near-threshold total cross section of the reaction γp → ϒp from which the absolute value of the ϒp-scattering length can be extracted using a vector-meson dominance model. For this evaluation, we used ϒ-meson photoproduction quasi data from the QCD approach (the production amplitude were factorized in terms of the gluonic generalized parton distributions and the quarkonium distribution amplitude). A comparative analysis of ϒp with the recently determined scattering lengths for ωp, ϕp, and J/ψp using the A2, CLAS, and GlueX experimental data is performed. The role of the ''young''’’ vector meson effect is evaluated.

V. A. Oreshkin

  (NRC KI - PNPI)

Measurements of the Higgs boson properties: current status at CMS, LHC.
  (Presentation)
  Abstract:
In the recent years, CMS continued to analyze the full Run-2 dataset. Taking advantage of the full recorded luminosity of 137 fb-1 and center-of-mass energy of 13 TeV, and novel analysis techniques, CMS enhanced precision of the previously measured properties of the Higgs boson and found evidences for certain Higgs couplings. The recent results include an improved precision of the Higgs boson mass. Also, differential measurements and CP structure of its Yukawa couplings, e. g. couplings to heavy fermions such as top quark and tau lepton, were studied. In the sector of second generation fermions, an evidence of the Higgs boson coupling to muons was obtained with a significance of 3σ, as well as an upper bound on the Higgs-charm coupling, for the first time. Besides the main 5 production and 5 decay modes, observed at statistical significances > 5σ, a more statistically limited and complicated decay of H → Z𝛾 was observed at statistical significance of 2.7σ. The measurement of the Higgs width, which will help to further constrain Higgs boson branching fractions to invisible or undetected decays, was done in an indirect way using its off-shell production, with the first evidence of the off-shell production observed at a significance of 3.6σ.

Vladimir M. Shabaev

  (SPbSU & NRC KI - PNPI)

How to observe the vacuum decay in low-energy collisions of heavy ions.
  Video
  Abstract:
It is known that in slow collisions of two bare nuclei with the total charge number larger than the critical value, Z_1+Z_2 > Z_c =173, the initially neutral vacuum can spontaneously decay into the charged vacuum and two positrons. Detection of the spontaneous emission of positrons would be the direct evidence of this fundamental phenomenon. However, the spontaneous positron emission is generally masked by the dynamical positron emission, which is induced by a rapidly changing electric field created by the colliding nuclei. For many years it was believed that the vacuum decay can be observed only in collisions with nuclear sticking, when the nuclei are bound for some period of time due to nuclear forces. But to date there is no evidence for the nuclear sticking in such heavy-ion collisions. In our recent papers [I.A. Maltsev et al., PRL, 2019; R.V. Popov et al., PRD, 2020], it was shown that the vacuum decay can be observed without any sticking of the nuclei. This can be done via measurements of the pair-production probabilities or the positron spectra for a given set of nuclear trajectories. The results of this study will be presented in the talk. In addition, some other interesting problems appearing in quantum electrodynamics at strong-coupling regime will be discussed.

M. V. Smirnov

  (Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen Centre for Astroparticle Physics (ECAP), Erlangen, Germany)

Neutrino physics in the experiment KM3NeT/ORCA.
  Video
  Abstract:
The underwater neutrino telescope ORCA, part of the European Neutrino Observatory KM3NeT, is located in the Mediterranean Sea. Due to the high density of digital optical modules, ORCA is sensitive to atmospheric neutrino oscillations. Detector deployment continues. The main purpose of the experimental campaign is to determine the neutrino mass hierarchy.

Aurel Bulgac

  (UW)

Unraveling The Many Facets of Non-Equilibrium Fission Dynamics: A Real-Time Quantum Approach.
  Video
  Abstract:
When comparing nuclear fission at the venerable age of almost 84 years old with other quantum many-body systems (superconductivity, superfluidity, quantum Hall effect, fractional quantum Hall effect, magnetism, etc.) it is surprising to find out how little is known and microscopically justified for this complex quantum non-equilibrium process. In the last decade a significant advancenment was achieved in modeling and disentangling aspects of fission, by means of a pure quantum approach. The level of agreement with observations, without the resort to any unverified theoretical assumptions, uncontrolled numerical approximations, or phenomenology and incorporating only the basic input needed to reproduce most of the well-known properties of nuclei, is surprisingly good. The theoretical framework requires only eight input parameters at most: the nuclear saturation density and energy, surface tension, the symmetry energy and its density dependence to a lesser degree, proton charge, the spin-orbit and the nuclear pairing interaction strengths. Some of our foremost theoretical findings are: i) the strongly damped character of the large amplitude collective motion beyond the outer saddle-point, ii) the fission fragment excitation energies and its sharing mechanism, and the somewhat surprising excitation energy exchange mechanism between the fission fragments before the fission fragments are fully accelerated, iii) the intrinsic fission fragment spins and their unexpected correlation character, iv) the nature and the properties of the non-equilibrium neutrons emitted before the fission fragments are fully accelerated, v) the strongly damped character of the fission fragment shape evolution after they are spatially separated, vi) the total kinetic energy of the fission fragments, vii) and the evolution of these properties with the initial excitation energy of the compound nucleus.

N.V. Nikitin

  (MSU, ITEP, Moscow)

The Bell inequalities and violation of them.
  (Presentation)
  Video
  Abstract:
The 2022 Nobel Prize in Physics was awarded for the experimental measurement of Bell's inequalities's violation. This story started in the 1920's from the discussion between A. Einstein and N. Bohr about the possibility of reducing the quantum paradigm to the classical one. These discussion were transferred to the experimental area in 1964 by J. Bell using some inequality. The violation of this inequality leads to Niels Bohr's win in this discussion. The first experimental results appeared in 1972. Up to the the present time the verification of the Bell inequalities violation continues.

Yu.A. Kulchitsky

  (JINR)

Study of KNO scaling in pp-collisions at energies from 0.9 to 13 TeV using results of the ATLAS at the LHC.
  (Presentation)
  Video
  Abstract:
The results of the study of KNO scaling in proton-proton interactions are presented at the centre-of-mass energies from 0.9 to 13 TeV based on the ATLAS results at the LHC. A comparison with similar results of other experiments at the LHC is given. The KNO distributions tend to be independent of energy for the highest energies.

V.M. Mochalov

  (NRC KI IPHE, Serpukhov)

Spin-Effect Investigation in SPASCHARM Experiment at Serpukhov Accelerator.
  (Presentation)
  Video

A.P. Serebrov

  (PNPI NRC KI, Gatchina)

The Neutrino-4 experiment - comparison of our result with the results of all other experiments on the search for sterile neutrinos.
   HEPD-THD_Seminar_2023.03.02_Serebrov.A.P.mp4 - Video of A.P. Serebrov's speech.

A.Yu. Voronin

  (P.N. Lebedev Physical Institute of RAN, Moscow)

Quantum states of anti-hydrogen in gravitational field and study of anti-hydrogen properties in GBAR experiment at CERN.
  (GbarПИЯФSeminar.pdf)
  HEPD_Seminar_Voronin_A.Yu._28.02.2023.mp4 - Video of A.Yu. Voronin's speech.

A.V. Derbin

  (PNPI NRC KI, Gatchina)

Measurement of solar CNO neutrinos in the Borexino experiment.
  (CNO_nejtrino_Derbin_seminar_HEPD_2023_v1.pdf)
  HEPD_Seminar_Derbin_A.V._21.02.2023.mp4 - Video of A.V. Derbin's speech.
  (Abstract - The nuclear fusion of hydrogen into helium in stars occurs, in addition to the proton-proton (pp-) chain, which includes only hydrogen and helium isotopes, through the carbon-nitrogen-oxygen (CNO) cycle, in which fusion is catalyzed by C, N and O nuclei. The CNO cycle produces only 1% of all solar energy and is secondary to the Sun. However, for more massive and hotter stars, this cycle is decisive. In 2020-22 the Borexino collaboration, which involves scientists from Russian institutes, for the first time presented the results of detection of neutrinos emitted in the reactions of the CNO cycle on the Sun.)

A.P. Serebrov

  (PNPI NRC KI, Gatchina)

The result of the Neutrino-4 experiment, sterile neutrinos and dark matter, the fourth neutrino and the Hubble constant.
   HEPD-THD_Seminar_2023.02.16_Serebrov.A.P.mp4 - Video of A.P. Serebrov's speech.

V.V.Korenkov

  (M.G. Mescheryakov LIT JINR, Dubna)

Distributed and hybrid computing for Large-scale scientific projects.
  (Korenkov_14.02.23_PNPI.pdf)
  HEPD_Seminar_Korenkov_V.V._14.02.2023.mp4 - Video of V.V.Korenkov's speech.
  (Abstract - The evolution of the global computer infrastructure for experiments at the LHC at CERN (WLCG) is presented. Large-scale scientific projects are being implemented in Russia (PIC, NICA, SKIF, BAYKAL,SILA…), the most important part of which is the creation of computer systems for processing experimental data. It is necessary to create a scientific collaboration in Russia, bringing together key scientific centers and universities participating in large-scale scientific projects.)

M.G Ryskin

  (PNPI NRC KI, Gatchina)

Polarization in inclusive processes (non-perturbative effects).
   (p-inc.pdf)
   HEPD-THD_Seminar_2023.02.09_Ryskin.M.G.mp4 - Video of M.G Ryskin's speech.

N.P. Topchiev

  (P.N. Lebedev Physical Institute, Moscow)

High-Energy Gamma-Ray Astronomy and Current Status of the GAMMA-400.
  HEPD_Seminar_Topchiev_N.P._07.02.2023.mp4 - Video of N.P. Topchiev's speech.
  (Abstract - A review is presented on the study of high-energy (more than 100 MeV) gamma-ray emission on spacecraft and ground-based facilities. Information on the development of the GAMMA-400 gamma-ray telescope for space observatory is presented: the results of calculations of the gamma-ray telescope performance and the results of the calibration of some gamma-ray telescope system prototypes on the positron beam of the S-25R accelerator (Troitsk, LPI).)

G.B. Safronov

  (INR RAS)

Deepwater neutrino telescope Baikal-GVD: the motivation of the experiment, the status of the detector and the latest results.
   HEPD-THD_Seminar_2023.02.02_Safronov.G.B.mp4 - Video of G.B. Safronov's speech.
   (Abstract - Neutrino propagates at large distances in space without trajectory bending or absorption and thus can provide information about remote sources of high-energy particles. In 2015 a deployment of the 1 km3 -scale neutrino telescope, Baikal-GVD, started in Lake Baikal. The experiment is focused on studies of the neutrino flux in the energy range between ~100 GeV and tens of PeV. Presently an instrumented volume of the detector is more than 0.4 km³ thus being the largest telescope of this kind in the North Hemisphere. In this talk we discuss the motivation of the experiment, status of the detector and the latest results.)

V.V. Koltsov

  (V.G. Khlopin Radium Institute)

Nuclear Isomers as Tool for Study of Vacuum Fluctuations Influence of Electromagnetic Field on Spontaneous Electromagnetic Transition Probability.
  (Kol'tsov-seminar-2023.pdf)
  HEPD_Seminar_Koltsov_V.V._31.01.2023.mp4 - Video of V.V. Koltsov's speech.
  (Abstract - A review of works on studying the effect of changing the frequency spectrum of zero-point fluctuations of the electromagnetic field inside metals on nuclear electromagnetic low energy transitions is presented.)

A.A. Dzyuba

  (PNPI NRC KI, Gatchina)

Investigation of Z boson production in pp interaction at vs=13 ÒeV in the LHCb experiment.
  (2023-01-24_Dzyuba_HEPD-PNPI-Seminar_Z-at-pp.pdf)
  HEPD_Seminar_Dzyuba_A.A._24.01.2023.mp4 - Video of A.A. Dzyuba's speech.
  (Abstract - Results of Z boson production study for forward angles in pp interaction at vs=13 ÒeV are presented. The measurements are performed by the LHCb experiment at LHC (CERN). The integral and differential cross sections of Z boson production are obtained [1], angular distributions of muon pairs are studied [2], evidence of possible charm quark contribution to the proton wave function is obtained [3]. Detection of Z boson decay muons for calibration allows to measure of the W boson mass [4].
Refs.: [1] JHEP 07 (2022) 026; [2] Phys. Rev. Lett. 129 (2022) 091801; [3] Phys. Rev. Lett. 128 (2022) 082001; [4] JHEP 01 (2022) 036.)

I.I. Strakovsky

  (GWU)

Light Baryon Resonances: Restrictions and Perspectives. [The author dedicates this talk to Yakov Isaakovich Azimov].
   (PNPI2023a.pdf)
   HEPD-THD_Seminar_2023.01.19_Strakovsky.I.I.mp4 - Video of I.I. Strakovsky's speech.
   (Abstract - The problem of nucleon resonances N' with masses below the Delta is considered. We derive bounds for the properties of such states. Some of these are new, while others improve upon existing limits. We discuss the nature of N' states, and their unitary partners, assuming that their existence can be verified.)

G.E. Gavrilov

  (PNPI NRC KI, Gatchina)

The Origin of Spontaneous Self-Sustaining Current in Proportional Chambers of Experiments at the LHC (According to Results of Detector Studies of the LHCb & CMS).
  (2023_01_17_HEPD_seminar.pdf)
  HEPD_Seminar_Gavrilov_G.E._17.01.2023.mp4 - Video of G.E. Gavrilov's speech.
  (Abstract - Over the years of operation the multiwire proportional chambers in the CMS and LHCb experiments at the LHC have shown that the only sign of their aging processes is the appearance of spontaneous self-sustaining currents. Long-term studies have shown that the source of these currents is the formation of unique low threshold emission nanocarbon structures. The nature of occurrence such formations gave a hint for development of the effective methods for emission current suppression, that today have been successfully tested on practice.)