HEPD Seminars (Tuesdays) and Joint HEPD-THD Seminars (Thursdays)

HIGH ENERGY PHYSICS DIVISION                  ( Switch to russian version of HEPD Seminars HEPD Seminars - Russian version)

       Past HEPD Seminars in:   2021;    2020;    2019;    2018;    2017;    2016;    2015;    2014;    2013;    2012;    2011;    2010;    2009;    2008;    2007;    2006;    2005;    2004;    2003;   

  • Next seminar:  
    Topic:  "Study of polarized dd-fusion in the PolFusion experiment. Motivation of the experiment and methods of analysis of experimental data."    
    (Abstract - In NRC "Kurchatov Institute" – PNPI the PolFusion experiment is preparing, which will study the reactions of D(d, n)3He and D(d, p)3H with a polarized beam and target at low energies up to 100 keV. In this experiment, differential cross-sections, analyzing powers and spin-correlation coefficients will be measured for various beam and target polarization. On session, the motivation of the experiment is presented and discussed. The paper contains a brief review of the theoretical approaches which can be used to describe dd-fusion. The mathematical calculations based on partial wave decomposition that will be used for processing the obtained experimental data are considered.)
    Speaker:   A.V. Andreyanov   (PNPI NRC KI, Gatchina).
    Place:  PNPI, Building 7,
    Time:   December 6, 2022, Seminar: 10:30

    Contact persons:  
    Dr. Sergey I. Manaenkov    (Phone: +7 (813 71) 46196   or  e-mail )

  • PNPI seminar:  
    Topic:  Studies of exotic nuclei at the ACCULINNA-2 facility. Prospects for low-energy nuclear physics in the Russian Federation - Grigorenko-Gatchina-2022.pdf".
    Speaker:   Academician of the RAS L.V.Grigorenko (JINR, Dubna).
    Place:  PNPI, Building 7, Main Conference Hall .
    Time:   September 22,   2022,   at   11:00.

  • PNPI seminar:  
    Topic:  "Laser ion source: history, status, prospects." ( Speech at a meeting of the Academic Council - Barzakh_RILIS-2020.pdf).
    Speaker:   A.E.Barzakh (PNPI NRC KI, Gatchina).
    Place:  PNPI, Building 7, Main Conference Hall .
    Time:   October 22,   2020,   at   15:00.

  • PNPI seminar:  
    Topic:  "Periodic Table after 150 years: superheavy elements." (Abstract in the format pdf=180 Кb,   More about the seminar)
    Speaker:   Academician of the RAS Y.TS. Oganesyan (Laboratory of Nuclear Reactions to them. G.N. Flerov Joint Institute for Nuclear Research (JINR)).
    Place:  PNPI, Building 7, Main Conference Hall .
    Time:   June 5,   2019,   at   15:00.

  • PNPI seminar:  
    Topic:  "Study on muon channel of Swiss meson facility. Muon catalysis of nuclear dd and dt fusion. Muon capture by light hydrogen nuclei." (Report in the format pdf=12 Mb)
    Speaker:   A.A.Vorobyov (PNPI NRC KI, Gatchina).
    Place:  PNPI, Building 7. Main Conference Hall
    Time:   February 21,   2013,   at   11:00

  • Joint seminar  H  E  P  D   -   T H D :     (ONLINE !!!)  
    Topic:  "Hadrons and high energies. Part 5."    
    Speaker:   Yu.L. Dokshitzer (PNPI NRC KI, Gatchina).
    Place:  PNPI, Building 7.
    Time:   December 8, 2022,   Seminar: 14:30

    Contact persons:  
    Prof. M.G.Ryskin    (Phone: +7 (813 71) 46096   or  e-mail )
    Prof. V.T.Kim  (Phone: +7 (813 71) 46722   or  e-mail )
    Dr. M.B.Zhalov  (Phone: +7 (813 71) 46131   or  e-mail )

    HEPD Seminars in 2022 :

      December 8,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

      (PNPI NRC KI, Gatchina)

    Hadrons and high energies. Part 5.
       HEPD-THD_Seminar_2022.12.08_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer's speech.

      December 6, 2022,   10:30

    A.V. Andreyanov

      (PNPI NRC KI, Gatchina)

    Study of polarized dd-fusion in the PolFusion experiment. Motivation of the experiment and methods of analysis of experimental data.
      (Andreyanov. Seminar PolFusion.pdf)
      HEPD_Seminar_Andreyanov_A.V._06.12.2022.mp4 - Video of A.V. Andreyanov's speech.
      (Abstract - In NRC "Kurchatov Institute" – PNPI the PolFusion experiment is preparing, which will study the reactions of D(d, n)3He and D(d, p)3H with a polarized beam and target at low energies up to 100 keV. In this experiment, differential cross-sections, analyzing powers and spin-correlation coefficients will be measured for various beam and target polarization. On session, the motivation of the experiment is presented and discussed. The paper contains a brief review of the theoretical approaches which can be used to describe dd-fusion. The mathematical calculations based on partial wave decomposition that will be used for processing the obtained experimental data are considered.)

      December 1,   2022,   14:30
      Joint Seminar HEPD - TPD

    I.I. Strakovsky


    Experimental tests of QCD scaling laws at large momentum transfer in exclusive light-meson photoproduction.
       HEPD-THD_Seminar_2022.12.01_Strakovsky.I.I.mp4 - Video of I.I. Strakovsky's speech.
       (Abstract - We evaluated CLAS Collaboration measurements for the 90 deg light pseudoscalar and vector meson photoproduction off the nucleon using a tagged photon beam spanning the energy interval s = 3 - 11 GeV2. The results are compared to the Quark Counting Rule predictions. The role of the Sudakov form-factor is considered.)

      November 29, 2022,   10:30

    V.G. Korolyov

      (PNPI NRC KI, Gatchina)

    Nonmaterial Basis of Life.
      HEPD_Seminar_Korolyov_V.G._29.11.2022.mp4 - Video of V.G. Korolyov's speech.
      (Abstract - The rapid development of the science of living organisms over the past centuries has not led to a generally accepted definition of the phenomenon of LIFE, although many attempts have been made. In my opinion, a very interesting approach to this problem at the end of the last century was developed in his book "Information and the Phenomenon of Life" by the famous Soviet geneticist prof. V.I. Korogodin. He puts at the forefront "The property that unites all the diversity of living beings is the ability to perform purposeful actions.")

      November 24,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

      (PNPI NRC KI, Gatchina)

    Hadrons and high energies. Part 4.
       HEPD-THD_Seminar_2022.11.24_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer's speech.

      November 22, 2022,   10:30

    Yu.M. Ivanov

      (PNPI NRC KI, Gatchina)

    Experiment on the splitting of a proton beam by a curved crystal at the PNPI synchrocyclotron.
      (Abstract - A recent experiment on the channeling of 1 GeV protons by a curved crystal is presented. The results obtained are compared with the data of other experiments. The continuation of the study and possible practical applications at the PNPI synchrocyclotron are discussed.)

      November 17,   2022,   14:30
      Joint Seminar HEPD - TPD

    M.G. Ryskin

      (PNPI NRC KI, Gatchina)

    A puzzle in the proton's electric generalized polarizability that remains unresolved for two decades.
       HEPD-THD_Seminar_2022.11.17_Ryskin.M.G.mp4 - Video of M.G. Ryskin's speech.
       (Abstract - We recall the meaning and definition of the proton polarizability and consider a new JLab measurement of the generalized polarizabilities (GP), which apparently confirms existence of a peak at Q2=0.33 GeV2 in Q2 dependence of the electric GP observed almost two decades ago in the MAMI experiment. This anomaly (peak at Q2=0.33 GeV2) has been questioned for many years since the theoretical calculations predict a monotonic fall-off with Q2.

      November 15, 2022,   10:30

    S.I. Stepanov

      (PNPI NRC KI, Gatchina)

    Investigation of value and creation mechanism of atmospheric plasmoid charge.
      HEPD_Seminar_Stepanov_S.I._15.11.2022.mp4 - Video of S.I. Stepanov's speech.
      (Abstract - The electric charge of the plasmoid was found earlier using a plasma probe. Recently the measuring equipment has been improved. The measured charge of the negative plasmoid turned out to be about -35 nC. To find the cause of the charge, the Gauss theorem is applied. To apply the theorem, a sphere is constructed around the plasmoid. Let's estimate the integral of the normal component of the electric field over the sphere. The electric field entering a spherical plasmoid through a plasma jet is small and occupies a small fraction on the sphere. The field coming out of the plasmoid in the streamer region is much larger and occupies a large part of the sphere. Thus, the integral is not zero, and the plasmoid has a charge during the discharge current. After the current is turned off, the charge does not drain to the electrodes, presumably due to the rapid decrease in the decrease in plasma conductivity between the plasmoid and the electrodes. This study shows that the electric charge is a property of the plasmoid, as it previously believed in relation to ball lightning.)

      November 10,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

      (PNPI NRC KI, Gatchina)

    Hadrons and high energies. Part 3.
       HEPD-THD_Seminar_2022.11.10_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer's speech.

      November 08, 2022,   10:30

    A.N. Dyachenko

      (PNPI NRC KI, Gatchina)

    Development of a non- equilibrium hydrodynamic approach to describing the emission of high-energy secondary particles in collisions of heavy ions of intermediate energies (from collisions of solitons to dark matter production).
      (A.T.Dyachenko 08.11.22.pdf)
      (Abstract - The report will attempt to demonstrate the heuristic value of the hydrodynamic approach in physics. The advantage of this approach in describing recent ITEP experimental data on the cumulative spectra of protons, pions, and photons in heavy ion collisions will be shown. An interpretation of the available experimental data on the detection of new X17 and X38 particles at accelerators in collisions of protons and nuclei is proposed.)

      November 3,   2022,   14:30
      Joint Seminar HEPD - TPD

    M.G. Ryskin

      (PNPI NRC KI, Gatchina)

    Hidden problems in the parton analyses.
       HEPD-THD_Seminar_2022.11.03_Ryskin.M.G.mp4 - Video of M.G. Ryskin's speech.
       (Abstract - Ryskin_seminar_November 3.jpg

      November 01, 2022,   10:30

    L.K. Gladilin

      (MSU, Moscow)

    Studies of B-physics in experiment ATLAS at LHC.
      HEPD_Seminar_Gladilin_L.K._01.11.2022.mp4 - Video of L.K. Gladilin's speech.
      (Abstract - Review of results on B-physics obtained by the ATLAS collaboration will be presented. The recent results will be discussed in detail and compared with those from other experiments. Prospects for further studies will also be outlined.)

      October 27,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

      (PNPI NRC KI, Gatchina)

    Hadrons and high energies - Part 2.
       HEPD-THD_Seminar_2022.10.27_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer's speech.
       (Abstract -
    1. Features of Feynman diagrams - Landau rules.
    2. Scattering of hadrons at high energies.
    Detailed plan to watch and listen in the file:
    Section: WHAT'S AHEAD - Part 2.)

      October 25, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Experimental search for new types of internucleon interactions beyond the Standard Model using neutron scattering.
      HEPD_Seminar_Shapiro_D.D._25.10.2022.mp4 - Video of D.D.Shapiro's speech.
      (Abstract - The report deals with the application of neutron powder diffraction for the search of new internucleon interaction of scalar-scalar type, as well as with the usage of data of neutron transmission through the non-centrosymmetric crystal for obtaining constraints on new interaction of axial-axial type.)

      October 18, 2022,   10:30

    E. V. Kuznetsova

      (PNPI NRC KI, Gatchina)

    Track detectors based on straw drift tubes.
      HEPD_Seminar_Kuznetsova_E.V._18.10.2022.mp4 - Video of E. V. Kuznetsova's speech.
      (Abstract - Trackers build of straw drift tubes are a perfect solution for precise track measurements in High Energy and Neutrino Physics experiments operating at low and moderate event rate. Small material budget and achievable large acceptance make the Straw Tube Trackers attractive for such future facilities like Near-Detector Complex of the DUNE experiment, the Spectrometer Straw Tracker of the SHiP experiment, and Straw Tracker of the SPD experiment. R&D on appropriate straw readout options includes laboratory and test beam measurements, and realistic simulation studies aiming a cheap, redundant and flexible solution.)

      October 13,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

      (PNPI NRC KI, Gatchina)

    Hadrons and high energies.
       HEPD-THD_Seminar_2022.10.13_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer's speech.

      October 11, 2022,   10:30

    V.V. Abramov

      (NRC “Kurchatov Institute” - IHEP, Protvino)

    Polarization phenomena at high energies.
      HEPD_Seminar_Abramov_V.V._11.10.2022.mp4 - Video of V.V. Abramov's speech.
      (Abstract - Theoretical and phenomenological aspects of polarization phenomena in the high-energy region are considered. An analysis was made of single-spin polarization effects, such as single-spin asymmetry of hadrons (AN), hyperon polarization (PN), polarization (α), and alignment (ρ00) of vector mesons. Possible mechanisms of the observed polarization phenomena are discussed, including the chromomagnetic polarization of quarks (CPQ) model, within which a global analysis of more than 120 inclusive and exclusive reactions is carried out. The dependence of polarization observables on kinematic and other variables, including the quark composition of particles, is considered.)

      October 6,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu. G. Naryshkin

      (PNPI NRC KI, Gatchina)

    Search for a dark matter in DAMA/LIBRA and COSINE-100 experiments.
       HEPD-THD_Seminar_2022.10.06_Naryshkin.Yu.G.mp4 - Video of Yu. G. Naryshkin's speech.
       (Abstract - The study of dark matter (DM) is one of the most urgent problems of modern physics. Currently, the search for the effects of the DM manifestation is carried out in many experiments with different experimental approaches. The DAMA/LIBRA collaboration, aimed at the direct detection of dark matter particles, announced recently a statistically significant result at the level of 13 standard deviations, which is interpreted as signals from the interactions of dark matter particles with electrons or nuclei in the sensitive volume of the detector. At the same time, other experiments with a similar detection technique do not confirm this observation. We will discuss the results of the DAMA/LIBRA experiment and their possible alternative interpretation proposed by the COSINE-100 collaboration.

      September 29,   2022,   14:30
      Joint Seminar HEPD - TPD

    N.N. Nikolaev

      (L.D. Landau ITP)

    Spin of particles in the storage rings (COSY, PTR , NICA) as an axion detector.
       HEPD-THD_Seminar_2022.09.29_Nikolaev.N.N.mp4 - Video of N.N. Nikolaev's speech.
       (Abstract - Axions, first proposed by Peccei and Quinn in 1977 as a solution to strong CP-violation in QCD, are widely discussed as a plausible candidate for dark matter. One of manifestations of the cold galactic halo axions can be a NMR-like resonant rotation of the spin in the oscillating axion field. Here the spin serves as an axion antenna. We discuss a new approach to search for axions in the storage ring experiments, applicable at short coherence time of the in-plane polarization as is the case for protons. The technique can readily be applied at any storage ring equipped with an internal polarimeter for the radial polarization of the beam (COSY, NICA, PTR). We point out a possibility of substantial broadening of the range of attainable axion masses in storage rings with the hybrid electric and magnetic bending, the PTR proton storage ring being an example.

      September 27, 2022,   10:30

    A.N. Nikitenko

      (NRCKI, ITEP, Moscow)

    Search for extra Higgs bosons at LHC.
      HEPD_Seminar_Nikitenko_A.N._27.09.2022.mp4 - Video of A.N. Nikitenko's speech.
      (Abstract - Recent results on searching Higgs bosons predicted in various theories beyond Standard Model. Results on searches for non-standard decays of the discovered Higgs boson. Observations of hypothetical light scalar particle decays to two photons, tau anti-tau and muon anti-muon pairs with significance more than three will be discussed in the final part of presentation.)

      September 22, 2022, 11:00

    Academician of the RAS L.V.Grigorenko

     (JINR, Dubna)

    Studies of exotic nuclei at the ACCULINNA-2 facility. Prospects for low-energy nuclear physics in the Russian Federation.
       PNPI_Seminar_2022.09.22_Grigorenko_L.V.mp4 - Video of L.V.Grigorenko's speech.

      September 20, 2022,   10:30

    Kh.U. Abraamyan

      (JINR, Dubna)

    Observation of structures in invariant mass spectra of photon pairs at 17 and 38 MeV/c^2.
      HEPD_Seminar_Abraamyan_Kh.U._20.09.2022.mp4 - Video of Kh.U. Abraamyan's speech.
      (Abstract - Results of spectrum analyses of photon pair masses produced in dC-, pC- и dCu-interactions at 2.75, 5.5, and 3.83 GeV/c momenta are presented. Strucrures with effective masses about 17 and 38 MeV/c^2 are observed. The obtained signals are tested with various methods including Monte-Carlo simulation. The tests confirm the conclusion that observed signals correspond to produced particles with masses approximately equal to 17 and 38 MeV/c^2 decaying into the photon pairs.)

      June 30,   2022,   14:30
      Joint Seminar HEPD - TPD

    V.V. Fedorov

      (PNPI NRC KI, Gatchina)

    The dynamic neutron diffraction and enhanced Stern-Gerlach effect for neutrons in the perfect crystals.
       (2022 Усиленный эффект Штерна-герлаха_ОФВЭ-ОТФ.pdf)
       HEPD-THD_Seminar_2022.06.30_Fedorov.V.V.mp4 - Video of V.V. Fedorov's speech.

      June 28, 2022,   10:30

    A.A. Dzyuba

      (PNPI NRC KI, Gatchina)

    Test of lepton universality in b-hadron decays.
      HEPD_Seminar_Dzyuba.A.A_28.06.2022.mp4 - Video of A.A. Dzyuba's speech.
      (Abstract - The lepton universality concept is discussed in the framework of the Standard Model of elementary particles and the status of its experimental test. Transitions due to both the neutral currents (b > s?+?–) and charged currents (b>c??) are discussed.)

      June 21, 2022,   10:30

    I.B. Smirnov

      (PNPI NRC KI, Gatchina)

    Algebraic methods for reconstruction of coordinates in cathode strip chambers.
      HEPD_Seminar_Smirnov.I.B_21.06.2022.mp4 - Video of I.B. Smirnov's speech.
      (Abstract - Many types of detectors, such as cathode strip chambers, provide a possibility to reconstruct track positions by induced strip charges. There are two main types of algebraic methods for this: center of gravity methods and little known differential methods. Methods of both types can provide fast and sometimes very accurate reconstruction of the track coordinate, which is in some cases an uninterrupted estimate of the coordinate. But a consistent description of differential methods, as well as descriptions of some center of gravity methods, is not yet presented. Their comparative performance is unknown. This report fills this gap. Many new generalized formulas of both types are deduced from general considerations. Their performance is studied with a simplified simulation of a detector.)

      June 16,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

      (PNPI NRC KI, Gatchina)

    QCD jets.
       HEPD-THD_Seminar_2022.06.16_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer's speech.

      June 14, 2022,   10:30

    Than Naing Soe

      (Physical Institute. P.N. Lebedev RAS, Moscow)

    Irradiated by cosmic rays meteorite olivines as a tool search for superheavy elements in nature (based on doctoral dissertation materials).
      HEPD_Seminar_Than_Naing_Soe_14.06.2022.mp4 - Video of Тан Найнг Со's speech.
      (Abstract - This work is related to topical problems of modern physics, which can be solved using track detectors. In particular, it describes in detail the experiment carried out by the author as part of the FIAN group to search for superheavy elements in nature - tracks of nuclei in olivines from meteorites within the framework of the OLYMPIA Experiment. The paper describes an original technique for working with olivines, presents the results of the study in the form of a charge distribution of the nuclei of galactic cosmic rays. During the work, three superheavy nuclei with a charge Z = 119+10?6 were observed. The paper investigates the cases of the appearance of tracks of a special shape and considers the possible reasons for their appearance. The effect of nuclear fragmentation on the shape of the charge distribution is shown. The charge distributions of unusually shaped nuclei in some olivine crystals are considered, and it is shown that the reason for this phenomenon may be the annealing of tracks during heating of a meteorite during its passage through the atmosphere. The reasons for the curvature of tracks in the Seimchan meteorite are investigated and it is shown that this is the result of a meteorite collision with another cosmic body. As a result, there was a local heating of the meteorite, its melting and displacement of olivine layers due to convection. The developed author's methods of working with track detectors (including those with nuclear emulsion) are successfully used in the preparation of experiments using nuclear emulsion, including international experiments to search for New Physics phenomena - SHiP and NEWSdm.)

      June 7, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Contribution of ultraperipheral collisions to diffractive proton-nucleus scattering at the LHC.
      HEPD_Seminar_Guzey.V.A_07.06.2022.mp4 - Video of V.A.Guzej's speech.
      (Abstract - Studies of diffraction in hadron scattering at high energies is an active field of research of strong interactions. In this seminar, we consider strong and electromagnetic (ultraperipheral) mechanisms of proton-nucleus coherent diffraction at the LHC and demonstrate the dominance of the latter. It allows us to explain the CMS data on the forward rapidity gap distribution in proton-nucleus (pPb) collisions at 8.16 TeV in the Pomeron-proton topology.)

      May 31, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Search for new physics in ultra-peripheral collisions at the Large Hadron Collider.
      HEPD_Seminar_Burmasov.N.A_31.05.2022.mp4 - Video of N.A.Burmasov's speech.
      (Abstract - Ultra-peripheral collisions of heavy ions can be distinguished by the large impact parameter between incoming nuclei, making this type of collisions a unique tool for studies of two-photon interactions in an environment with strongly suppressed hadronic interactions. In particular, there has been an increasing interest in analysis of such processes as ditau production and light-by-light scattering. Possible deviations of measured cross sections from predictions of Standard Model calculations may indicate presence of new physics. Furthermore, there is a special interest in searches for possible production of axion-like particles in the light-by-light scattering process at low invariant masses.
      In this seminar, recent results from the Large Hadron Collider experiments on measurements of tau anomalous magnetic moment and light-by-light cross sections, as well as searches for axion-like particle production will be discussed. The future prospects of the measurements with the ALICE experiment will be considered.)

      May 26,   2022,   14:30
      Joint Seminar HEPD - TPD

    V.A. Khoze

      (PNPI NRC KI, Gatchina)

    Coulomb threshold effects in the WW production and prospects of precision measurement of the W-boson mass.
       HEPD-THD_Seminar_2022.05.26_Khoze.V.A.mp4 - Video of V.A. Khoze's speech.
       (Abstract - An accurate determination of the W boson mass is one of the most important physics goals of the future e+e machines. We address the theoretical issues related to the precision measurements of the WW cross-section lineshape near threshold. Special attention is paid to the Coulomb threshold effects. The prospects of mass measurement at future e+e- colliders with a MeV accuracy are discussed.

      May 24, 2022,   10:30

    T.A. Shtam

      (PNPI NRC KI, Gatchina)

    Application of boron preparations for increasing efficiency of radiation sickness therapeutics.
      HEPD_Seminar_Shtam.T.A_24.05.2022.mp4 - Video of T.A. Shtam's speech.

      May 19,   2022,   14:30
      Joint Seminar HEPD - TPD

    A.V. Shuvaev

      (PNPI NRC KI, Gatchina)

    Generating function for nucleus-nucleus scattering amplitudes in Glauber theory.
       HEPD-THD_Seminar_2022.05.19_Shuvaev.A.V.mp4 - Video of A.V. Shuvaev's speech.
       (Abstract - A new approach to deal with the scattering amplitudes in Glauber theory is proposed. It relies on the use of generating function, that has been explicitly found. The method is applied to the analytical calculation of the nucleus-nucleus elastic scattering amplitudes in the all interaction orders of the Glauber theory.

      May 17, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Recent results on the exchange of color singlets in pp collisions at the LHC.
      (Abstract - Recent results on hard color-singlet exchange in pp collisions from CMS at LHC reach previously unexplored size of rapidity gap in dijet production, as well as higher collision energies, 7 and 13 TeV. Also, for the fist time, using the CMS-TOTEM combined measurements, the process with two rapidity gaps, one inside a dijet, and another between the dijet and an intact proton, was measured. This helps to better understanding the role of QCD (BFKL) Pomeron at high energies and the impact of spectator partons in the destruction of the rapidity gap.)

      May 12,   2022,   14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

      (PNPI NRC KI, Gatchina)

    QCD -50.  
       HEPD-THD_Seminar_2022.05.12_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer's speech.

      April 28,   2022,   14:30
      Joint Seminar HEPD - TPD

    M.G. Ryskin

      (PNPI NRC KI, Gatchina)

    QCD instanton in Diffractive events.  
       HEPD-THD_Seminar_2022.04.28_Ryskin.M.G.mp4 - Video of M.G. Ryskin's speech.
       (Abstract - Instanton is the non-perturbative classical solution of QCD equations. It is caused by the non-trivial structure of non-abelian QCD vacuum. Up to now Instanton was never observed experimentally. We describe the signatures of the instanton signal, the expected background and propose the cuts to select the QCD instanton at the LHC. Single dissociation and the central instanton production is considered. In diffractive events there is a chance to observe the instanton signal which is by an order of magnitude larger than that from the background.)

      April 26, 2022,   10:30

    D.V. Novinsky

      (IHEP, Protvino)

    The Lambda hyperon asymmetry and polarization measurements at the SPASCHARM experiment.
      HEPD_Seminar_Novinsky.D.V_26.04.2022.mp4 - Video of D.V. Novinsky's speech.
      (Abstract - The SPASCHARM experiment (NRC KI - IHEP, Protvino) will be the first in the world to offer the possibility of simultaneous measurements both of asymmetry, A_N and polarization, P_N for the Lambda hyperon. The Comparison of the specified parameters for hyperons opens up additional possibilities for choice in favor of a particular theoretical model. In particular, the developed at IHEP phenomenological model of quark chromomagnetic polarization which claims to be a global explanation of polarization effects at the hadron interactions.)

      April 21,   2022,   14:30
      Joint Seminar HEPD - TPD

    V.A. Khoze

      (PNPI NRC KI, Gatchina)

    Top quark studies is one of the major fields in particle physics.  
       HEPD-THD_Seminar_2022.04.21_Khoze.V.A.mp4 - Video of V.A. Khoze's speech.
       (Abstract - In this talk we discuss the unique properties of the top quark, the heaviest known particle in the Universe and the only "free" coloured object and a special role which it plays in the Standard model and in many extensions beyond. We emphasize the importance of the accurate measurements of the top properties, in particular, the mass. It is argued that the best possibility for precision measurements of the top quark mass, width and other parameters will be provided by the threshold scan of the top quark pair production at a future electron-positron collider. At the end, the saga of the so-called Higgstrahlung process (aka Bjorken process) of Higgs production at electron colliders will be briefly presented.

      April 19, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Sources of Polarized Deuterium Atoms and Ions in the PolFusion Experiment.
      HEPD_Seminar_Soloviev.A.N_19.04.2022.mp4 - Video of A.N.Soloviev's speech.
      (Abstract - The author describes techniques of formation and detection of polarized deuterium atoms and ions in the experiment PolFusion that aims to study polarized dd fusion. The equipment was updated in various ways by the PNPI group. The results of improvements are presented in the talk.)

      April 14,   2022,   14:30
      Joint Seminar HEPD - TPD

    M.G. Ryskin

      (PNPI NRC KI, Gatchina)

    Dynamics of the diffractive dissociation in hadronic processes.  
       HEPD-THD_Seminar_2022.04.14_Ryskin.M.G.mp4 - Video of M.G. Ryskin's speech.
       (Abstract - The model which incorporates the main properties of inclusive particle distributions expected for diffractive processes at high energies is described. The model includes the diffusion of partons in impact parameter space and accounts for the absorptive effects and the growth of 'wee' parton transverse momenta when the parton density becomes large (close to saturation). We consider the differential elastic cross section (d\sigma_{el}/dt), the dependence of single parton dissociation (\xi d\sigma/d\xi) on the momentum fraction \xi=1-x_L lost by the leading proton and on the momentum transfer, t, and multiplicity distribution in high mass proton dissociation.

      April 12, 2022,   10:30

    O.E. Maev

      (PNPI NRC KI, Gatchina)

    New LHCb detector after modernization. Status and Perspectives.
      HEPD_Seminar_Maev.O.E_12.04.2022.mp4 - Video of O.E. Maev's speech.
      (Abstract - The short review of works for three years devoted to detector modernization is presented. The detector status before RUN3 of data taking is discussed. Mistake removing is also considered. PNPI group contribution into muon detector construction and modernization and proposals for the future improvements are discussed.)

      April 7,   2022,   14:00
      Joint Seminar HEPD - TPD

    M.I. Strikman

    The Short-Range NN Correlations and EMC effect.  
       HEPD-THD_Seminar_2022.04.07_Strikman.M.I.mp4 - Video of M.I. Strikman's speech.

      April 5, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Role of Fermi Statistics in Glauber Scattering Amplitudes.
       HEPD_Seminar_Manaenkov.S.I_05.04.2022.mp4 - Video of S.I.Manaenkov's speech.
       (Abstract - Various approximations in Glauber theory, using nucleon densities instead of wavefunctions, are considered. An application of completeness relation to obtain the one-particle approximation is discussed. The theory property which explains the smallness of nucleon correlation contributions is considered.)

      March 31,   2022,  14:30
      Joint Seminar HEPD - TPD

    A. P. Serebrov

    (PNPI NRC KI, Gatchina)

    Sterile neutrinos and dark matter.     (Serebrov-31.03.2022.pdf)
       HEPD-THD_Seminar_2022.03.31_Serebrov.A.P.mp4 - Video of A. P. Serebrov's speech.

      March 29, 2022,   10:30

    O.V. Miklukho

      (PNPI NRC KI, Gatchina)

    Structure observation in high-momentum spectra of secondary protons in inclusive scattering 12C(p, p’)X at angles of 21о and 24.5о at 1 GeV (momentum intervals s4 and s5).
       HEPD_Seminar_Miklukho.O.V_29.03.2022.mp4 - Video of O.V. Miklukho's speech.
       (Abstract - The observed structure in the momentum intervals s4 and s5 can be due, in particular, to the quasi-elastic scattering of protons by four-nucleon clusters similar to the 4He nucleus inside the 12C nucleus under study.)

      March 24,   2022,  14:30
      Joint Seminar HEPD - TPD

    F.F. Karpeshin

    (D.I. Mendeleev Institute for metrology)

    The non-resonance shake-off mechanism of the Neutrinoless Double Electron Capture in nuclei.     (Karpeshin-24.03.2022.pdf)
       HEPD-THD_Seminar_2022.03.24_Karpeshin.F.F.mp4 - Video of F.F. Karpeshin's speech.

      March 22, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    CP violation in neutron transmission.
      (Lukashevich-seminar-March 22, 2022.pdf)
       (Abstract - It is shown that the imaginary part of the neutron interaction, which depends on helicity, does not preserve spatial parity and due to the antiunitarity of the time reversal operation, violates T-invariance.)

      March 15, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Measurement of the proton charge radius. PRES and AMBER experiments. Technical features and status.
       HEPD_Seminar_Vznuzdaev.M.E_15.03.2022.mp4 - Video of M.E.Vznuzdaev's speech.
       (Abstract - The general design issues of experimental facilities for PRES and AMBER projects are considered. PNPI group as a part of international collaboration is developing the projects. The main attention is focused on the technical features of the installations, primarily on the central detectors designed within the framework of the "active target" concept.)

      March 3,   2022,  14:30
      Joint Seminar HEPD - TPD

    M.G. Kozlov

    (PNPI NRC KI, Gatchina)

    Search for the variations of fundamental constants at large red shifts.  
       HEPD-THD_Seminar_2022.03.03_Kozlov.M.G.mp4 - Video of M.G. Kozlov's speech.

      March 1, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Artificial Intelligence and rising of Artificial Neural Networks.
       HEPD_Seminar_Shevel.A.E_01.03.2022.mp4 - Video of A.Ye.Shevel's speech.
       (Abstract - The terms ‘Artificial Intelligence’ and ‘Artificial Intellect’ are close in the meaning. However, ‘Artificial Intellect’ has anthropomorphic flavor where ‘Artificial Intelligent’ is neutral to any creature: might be mammal or robot or insect. Last 10 years it is seen the rising of artificial neural networks as big part of Artificial Intelligence. Reporter plans to show quick review of interesting/useful features of the artificial neural networks and several examples of their use.)

      February 24,   2022,  11:00
      Joint Seminar HEPD - TPD

    D.S. Gorbunov

    (Institute for Nuclear Research RAS)

    Problems with fitting the cosmological data in LambdaCDM.     (gorbunov_pnpi_24.02.2022.pdf)
       HEPD-THD_Seminar_2022.02.24_Gorbunov.D.S.mp4 - Video of D.S. Gorbunov's speech.
       (Abstract - Cosmological analysis can infer the physical parameters with accuracy exceeding 1%. At this level we face some anomalies, when the numbers obtained with different data sets deviate by 2, 3, 4 and even 5 sigmas. We will describe the situation and discuss some of the suggested ideas, all of them (except blaming the astronomers) ask for many new ingredients without convincing results... And we start the seminar with a couple of comments about neutrino role in cosmology, a slight follow-up to the previous seminar.
    consequences for cosmology and astrophysics.

      February 22, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Experiments at the ISOLDE facility (CERN).
       HEPD_Seminar_Fedorov.D.V_22.02.2022.mp4 - Video of D.V.Fedorov's speech.
       (Abstract - The ISOLDE installation (Isotope Separator On-Line Device) is a mass separator research complex installed on the proton beam of the Booster accelerator. It is designed for the efficient production of ion beams of various isotopes, the study of the of exotic nuclei properties, research in the field of solid state physics, medicine. The report describes the main physical installations operating on ISOLDE, the physical tasks facing them, presents the latest achievements in the laser spectroscopy, and development prospects.)

      February 15, 2022,   10:30

    V.V. Chulikov

      (PNPI NRC KI, Gatchina)

    Investigation of fragmentation fractions in proton-proton collisions.
       (Abstract - The information about fragmentation process can be obtained by analyzing the fragmentation fractions. The fragmentation fractions can be measured by evaluating the ratios of the differential production cross sections. In the first part of the presentation, the method for obtaining fragmentation fractions in proton-proton collisions will be described. In the second part, the preliminary results of calculating the fragmentation fractions of excited states of charmed ΞC-baryons in the Run 1 LHCb data will be presented.)

      February 10,   2022,  14:30
      Joint Seminar HEPD - TPD

    D.S. Gorbunov

    (Institute for Nuclear Research RAS)

    Light Sterile Neutrinos.     (gorbunov_pnpi_10.02.2022.pdf)
       HEPD-THD_Seminar_2022.02.10_Gorbunov.D.S.mp4 - Video of D.S. Gorbunov's speech.
       (Abstract - Neutrinos oscillate, which implies some physics beyond the Standard Model (SM). Experiments on neutrino oscillations provide with precise measurements of three mixing angles and two mass differences, and some hint on CP-violating phase.There are also several experiments which results do not fit to the simple pattern of three SM neutrino, and tempt us to introduce more (sterile) neutrinos with masses of order 1 eV. We plan to discuss these anomalous experiments, including the very recent one BEST, problems in joint analysis and possible consequences for cosmology and astrophysics.)

      February 1, 2022,   10:30


      (PNPI NRC KI, Gatchina)

    Disstellation of a ternary (Н2, D2, HD) mixture of hydrogen isotopes in the framework of an experiment on D3He mesocatalytic synthesis.
       (Abstract - The report discusses the principles of separation of light hydrogen isotopes (H2, D2, HD) in a cryogenic distillation column designed for the MUCAP experiment and used in MUSUN and the current experiment on D3He mesocatalytic synthesis. In the current experiment, a technique has been developed to obtain HD from a triple mixture of isotopes.)

      January 27,   2022,  14:30
      Joint Seminar HEPD - TPD

    Yu.L. Dokshitzer

    (PNPI NRC KI, Gatchina)

    Radiative energy losses of fast quarks crossing a cold nucleus or hot quark-gluon medium.  
       HEPD-THD_Seminar_2022.01.27_Dokshitzer.Yu.L.mp4 - Video of Yu.L. Dokshitzer 's speech.

      January 25, 2022,   10:30

    D.E. Sosnov

      (PNPI NRC KI, Gatchina)

    MC Generators for Diffraction Hadronic and Nucleus Collisions at High Energies: EPOS-LHC, QGSJET II and PYTHIA.   (_Sosnov__PNPI_presentation_2022_01_25_.pdf)
       (Abstract - This is a review of various models of diffraction processes, which are utilized in Monte Carlo event generators for hadronic and nuclear high-energy collisions: PYTHIA, EPOS-LHC, and QGSJET II.)

      January 18, 2022,   10:30

    A.Yu. Egorov

      (PNPI NRC KI, Gatchina)

    Search for QCD asymptotic BFKL effects in CMS experiment.   (PNPI_HEPD_seminar_18_01_2022.pdf)
       HEPD_Seminar_Egorov.A.Yu_18.01.2022.mp4 - Video of A.Yu. Egorov's speech.
       (Abstract - The CMS experiment at the LHC provides a unique opportunity to search for direct BFKL effects. Measurements of the dijet production with low transverse momenta and large rapidity separation at all currently available energies (2.76, 7 and 13 TeV) at the LHC may reveal direct signals of BFKL dynamics.)

      January 13,   2022,  14:30
      Joint Seminar HEPD - TPD

    A.P. Serebrov

    (PNPI NRC KI, Gatchina)

    Sterile neutrinos and the neutrino model 3+1 from the view of existing experimental data.     (Serebrov.pdf)
       HEPD-THD_Seminar_2022.01.13_Serebrov.A.P.mp4 - Video of A.P. Serebrov's speech.

      January 11, 2022,   10:30

    V.G. Ryabov

      (PNPI NRC KI, Gatchina)

    Polarization Phenomena in Heavy Ion Collisions at LHC.   (Doklad_v5.pdf)
       HEPD_Seminar_Ryabov.V.G_11.01.2022.mp4 - Video of V.G. Ryabov's speech.


    Past HEPD Seminars in:   2021;    2020;    2019;    2018;    2017;    2016;    2015;    2014;    2013;    2012;    2011;    2010;    2009;    2008;    2007;    2006;    2005;    2004;    2003;   

HIGH ENERGY PHYSICS DIVISION                  ( Switch to russian version of HEPD Seminars HEPD Seminars - Russian version  )

Last update on:   by  Svetlana F. Udalova