XXXI International workshop on high energy physics "Critical points in the modern particle physics"

NRC "Kurchatov Institute", SRC RF IHEP, Protvino

NRC "Kurchatov Institute", SRC RF IHEP, Protvino

Russian Federation, NRC "Kurchatov Institute", SRC IHEP, Theoretical Division, Protvino
Nikolai Tyurin (Institute for High Energy Physics (RU)), Roman Riutin (Institute for High Energy Physics (RU)), Vladimir Petrov (Institute for High Energy Physics (RU))

National Research Centre "Kurchatov Institute" - Institute for High Energy Physics  is organizing the XXXI-th International Workshop on High Energy Physics “Critical points in the modern particle physics”, July 5-7, 2017, in Protvino, Moscow region, Russia.

 The purpose of this Workshop is to exhibit a more complete and coherent picture of our understanding of the structure and dynamics of the microcosm, the megacosm and its evolution and the relationship between these two extremes of modern physics.

 The Workshop covers both theory and experiment/observations in most actual and critical points.

 We would like to promote, at the meeting, much more critical discussions than is usually the case. We strive to make the meeting not only informative but also to give it a truly working character with the aim to elaborate meaningful and clear conclusions about the actual state of affairs in the main areas of high-energy particle and astroparticle physics, gravitation and cosmology, with an emphasis on difficulties and unresolved problems.

 To this end the meeting will be organized so that regular talks will be accompanied by discussions. The poster exhibition for brief actual notes is also envisaged.

 Topics to discuss contain presumably Higgs boson, hadron spectroscopy, heavy flavour physics, CP-violation, neutrino oscillations and the problem of neutrino mass, quark-gluon plasma and other exotic states of matter, QCD at short and large distances, astroparticle data from exploratory researches on dark matter, dark energy and black holes, early and present Universe, cosmic microwave background radiation, gravitation waves, progress in experimental and accelerator techniques.

 We believe that such a relatively wide scope of subjects for presentation and discussion will be also a good opportunity for participants to learn first hands about the state of art in the fields of common interest where they are not experts.

Talks and discussions

 Presentations are limited to 25 minutes for the talk proper with 4 additional minutes for discussion and 1 minute for transition to the next presentation and introduction of the next speaker.

Participation is by invitation of the Organizing Committee


Payment is upon arrival, please change your currency to rubles before the workshop:
- 19500 rub. (~300 Euro) for participants
9800 rub. (~150 Euro) for accompanied persons.

Includes visa payments, transportation from/to the airport, coffee breaks, conference dinner, welcome and farewell parties, complete set for the participant, publication of proceedings.


February 2, 2017 - start of the registration procedure and abstract submission
April 15, 2017registration deadline for those who needs Russian visa
April 15, 2017 - start of the presentation upload
May 1, 2017! - very final deadline for those who needs Russian visa!
June 10, 2017 - registration deadline for domestic participants
June 30, 2017 - end of the registration procedure and abstract submission  

Since visa formalities may take a long time, please, try to send us the information as early as possible (it is better before April 15, 2017).

Please, send us the title of your talk (even if very preliminary) before June 15, 2017 and try to upload your presentation by the web interface (will be open after February 2, 2017) or send it by e-mail to  before June 15, 2017.

Please, inform organizers about any changes.


Participation is by invitation of the Organizing Committee.
In the case of a proactive request the decision is made by the selection committee.

About 60 scientists from Russia and other countries are expected to participate. The sessions will be held in the Conference Hall of the Theory Division Building.

The Proceedings of the Workshop will be published in the “World Scientific” Publishing Company.


The Workshop will be held in Protvino, a small town 110 km to the south of Moscow. The town is situated nearby the State Research Center of Russia—IHEP (Serpukhov 76 Gev accelerator) inside a pine forest and near the Protva river.

The participants will be accommodated in the “Protva” hotel in single or double rooms. Prices for one night are from 35Euro (~2500 rubles) to 100Euro (~7000 rubles). The total living expenses (including breakfast, lunch, and dinner) will be about 10-15Euro (700-1000 rubles) a day. The participants can have their meal in the restaurant and snack-bar of the Hotel, in the restaurant of the Club of Scientists or in other restaurants of Protvino indicated in the map.


All the participants will be transported from/to the Sheremetievo or Domodedovo airports by the IHEP transport or taxi. The information on flights or trains and the date of arrival should be communicated to the Scientific Secretary of the Organizing Committee a few days in advance.

  • Alberto Cervelli
  • Aleksei Ezhilov
  • Alexander Vorobiev
  • Alexander ZAKHAROV
  • Anton Godizov
  • Atsushi Nakamura
  • Bjarne Stugu
  • Dmitri Peresunko
  • Evgeny Kondratyuk
  • Hamzeh Khanpour
  • Igor Bulyzhenkov
  • Kevin Black
  • Lev Fil'kov
  • Luca Nanni
  • Mohamed Naciri
  • Ng K Francis
  • Oleg Selyugin
  • Roman Riutin
  • Roman Rogalyov
  • Roman Zhokhov
  • Salah Eddine ENNADIFI
  • Sergey Troshin
  • Serguei Sadovskiy
  • Stanislav Poslavskii
  • Stefano Lucat
  • Vadim Ilukin
  • Viacheslav Kuvshinov
  • Vitaly Bornyakov
  • Vladimir E. Rochev
  • Vladimir Petrov
  • Vladimir Soloviev
  • Vladislav Korotkov
  • Yuri Kharlov
  • Yury F. Pirogov
    • Morning session
      • 1
        Opening address
        Speaker: Vladimir Petrov (IHEP)
      • 2
        Searches for Supersymmetry in ATLAS
        Speaker: Alberto Cervelli (INFN, Bologna, Italy)
      • 3
        Searches in ATLAS

        Recent results of searches for TeV-scale BSM phenomena in proton-proton collisions at $\sqrt{s} = 13$~TeV with ATLAS detector are presented.
        The report covers searches for objects and signatures originating from a variety of SM extensions:extended Higgs sector, extra gauge bosons, heavy and excited quarks leptoquarks, extra dimensions, contact interactions.

        Speaker: Oleg Zenin (IHEP, Protvino)
      • 10:20 AM
        Coffee break
      • 4
        Overview of ALICE results

        The ALICE experiment at the LHC performs comprehensive studies of the QCD matter with pp, p-Pb and Pb-Pb collisions. A complete set of observables measured by ALICE allows one to study particle production in QCD vacuum in pp collisions, investigate initial-state and possible collective effects in p-Pb collisions and explore properties of the deconfined quark-gluon matter at high temperature and energy density in Pb-Pb collisions. In this talk, an overview of the recent results obtained by the ALICE collaboration from the data collected during the LHC Run1 and ongoing Run2 is given. Upgrade program for Run3 will be also presented.

        Speaker: Dmitri Peresunko (NRC Kurchatov Institute)
      • 5
        Lattice QCD, Heavy Ion Collisions, and QCD Phase Structure

        One of the important missions of high energy heavy ion collisions is to reveal the QCD phase structure at finite temperature and baryon density. Lattice QCD simulations are expected to provide valuable information as a first principle calculation of QCD. However, lattice simulations at finite baryon density have suffered from the sign problem' and no calculations were successful except at very low density. FEFU group has developed a method,Canonical Approach', for beating the sign problem. This method was known, but not practical. We have studied origins of errors and instability, and now we are near to the final goal.

        Speaker: Atsushi Nakamura (FEFU, Vladivostok)
    • 12:10 PM
      Excursion to the IHEP Accelerator U-70
    • 1:30 PM
      Lunch & rest
    • Evening Session
      • 6
        Cosmology of bigravity
        Speaker: Vladimir Soloviev (IHEP, Protvino)
      • 7
        Einstein equation for nondual field matter modifies Naiver-Stocks dynamics

        Continuous material space in the nondual field physics of Einstein and Infeld replaces the assumed emptiness between point particles in the Newton model of reality. The internal heat of circular metric flows creates the elementary mass-energy and this kinetic energy is balanced by the negative self-gravitation energy. The Einstein equation analog for nonequilibrium field densities of moving nondual matter results in the vector geodesic relations for metric mass-energy flows that modifies the Navier-Stocks equation by the 1738 Bernoulli potential. Based on arXiv 1705.04155

        Speaker: Igor Bulyzhenkov (MIPT, Moscow)
      • 4:00 PM
        Coffee break
      • 8
        SU(2)-Gluon Propagators and the $A_\mu^2$ Asymmetry in the Postconfinement Domain

        We study numerically the chromoelectric-chromomagnetic asymmetry of the dimension two $A^2$ gluon condensate as well as the {\it transverse and longitudinal} gluon propagators at $T>T_c$ in the Landau-gauge $SU(2)$ lattice gauge theory with a particular emphasis on finite-volume effects. We show that previously found so called symmetric point at which asymmetry changes sign is an artifact of the finite volume effects. We find that with increasing temperature the asymmetry decreases approaching zero value from above in agreement with perturbative result. Instead of the asymmetry we suggest the ratio of the transverse to longitudinal propagator taken at zero momentum as an indicator of the boundary of the postconfinement domain and find it at $T \simeq 1.7 T_c$.

        Speaker: Roman Rogalyov (IHEP, Protvino)
      • 9
        Dipole polarizabilities of pi+- meson

        The main experimental works, where dipole polarizabilities of charged pions have been determined, are discussed. Possible reasons for the differences between the experimental data are considered. In particular, it is shown that the account of the $\sigma$-meson gives a significant correction to the value of the polarizability obtained in the latest experiment of the COMPASS collaboration.

        Speaker: Lev Fil'kov (LPI, Moscow)
      • 10
        Charged pion condensation in chirally asymmetric dense quark matter: Consideration of an NJL2 model with spatially inhomogeneous condensates

        In this talk we investigate the phase structure of a (1+1)-dimensional schematic quark model with four-quark interaction and in the presence of baryon (µB), isospin (µI) and chiral isospin (µI5) chemical potentials. Spatially inhomogeneous chiral density wave (for chiral condensate) and single wave (for charged pion condensate) approaches are used. It is established that in the large-Nc limit (Nc is the number of colored quarks) there exists a duality correspondence between the chiral symmetry breaking phase and the charged pion condensation (PC) one. Moreover, it is shown that inhomogeneous charged PC phase with nonzero baryon density is induced in the model by arbitrary small values of the chemical potential µI5 (for a rathwer large region of µB and µI).

        Speaker: Roman Zhokhov ( IHEP, Protvino)
    • 6:30 PM
    • 7:30 PM
      Welcome Party
    • 9:30 AM
      Excursion to the the Michail Zablotsky Prioksko-Terrasny Nature Biosphere Reserve Nature


    • 1:30 PM
      Lunch & rest
    • Evening session
      • 11
        ATLAS Top Quark Results

        The top quark is the heaviest known fundamental particle. As it is the only quark that decays before it hadronizes, this gives us the unique opportunity to probe the properties of bare quarks at the Large Hadron Collider. This talk will present highlights of a few recent precision measurements by the ATLAS Collaboration of the top quark using 13 TeV and 8 TeV collision data: top-quark pair and single top production cross sections including differential distributions will be presented alongside top quark properties measurements. These measurements, including results using boosted top quarks, probe our understanding of top quark production in the TeV regime. Measurements of the top quark mass and searches for rare top quark decays are also presented.

        Speaker: Kevin Black (Boston University, USA)
      • 12
        QCD analysis of leading-neutron production at HERA: Determination of neutron fracture functions

        In recent years, several dedicated experiments at the $e^- p$ collider HERA have collected high precision data on the spectrum of leading-neutron and leading-proton carrying a large fraction of the proton's energy. In [Phys. Rev. D 95, 074011 (2017), \, arXiv:1703.04369 [hep-ph]], we propose a technique based on the fractures functions framework and extract the neutron fracture functions (neutron FFs) from global QCD analysis of leading-neutron production data measured by H1 and ZEUS collaborations. We have shown that an approach based on the fracture functions approach allows us phenomenologically parametrize the neutron FFs. In order to asses the uncertainties in the resulting neutron FFs as well as the corresponding observables, associated with the uncertainties in the data, we have made an extensive use of the well-known Hessian method. The theory predictions based on the obtained neutron FFs are in good agreement with all data analyzed, for a wide range of scaled fractional momentum variable $\beta$ as well as the longitudinal momentum fraction $x_L$.

        Speaker: Hamzeh Khanpour (University of Science and Technology of Mazandaran, Behshahr, IRAN)
      • 13
        Asymptotic behavior and critical coupling in the scalar Yukawa model”
        Speaker: Vladimir Rochev (IHEP, Protvino)
      • 4:40 PM
        Coffee break
      • 14
        Different ways to estimate graviton mass

        In February 2016 the LIGO \& VIRGO collaboration reported the discovery of gravitational waves in merging black holes, therefore, the team confirmed GR predictions about an existence of black holes and gravitational waves in the strong gravitational field limit. Moreover, in their papers the joint LIGO \& VIRGO team presented an upper limit on graviton mass such as $m_g < 1.2 \times 10^{-22}$~eV (Abbott et al. 2016) analyzing gravitational wave signal as it was suggested by C. Will (1998). So, the authors concluded that their observational data do not show any violation of classical general relativity. We show that an analysis of bright star trajectories could constrain graviton mass with a comparable accuracy with accuracy reached with gravitational wave interferometers and the estimate is consistent with the one obtained by the LIGO \& VIRGO collaboration. This analysis gives an opportunity to treat observations of bright stars near the Galactic Center as a useful tool to obtain constraints on the fundamental gravity law such as modifications of the Newton gravity law in a weak field approximation. In that way, based on a potential reconstruction at the Galactic Center we obtain bounds on a graviton mass.

        Speaker: Zakharov Alexander (ITEP, Moscow)
      • 15
        Is There a Hollow Inside the Proton?
        Speaker: Vladimir Petrov (IHEP, Protvino)
      • 16
        Round table discussion "Critical points. Can we trust the experimental data?"

        Moderator: Vladimir Petrov
        Participants: V. Ezhela, B. Stugu, K. Black, A. Cerveli, O. Zenin, L. Nanni, O. Selyugin

        Speaker: Vladimir Petrov (IHEP, Protvino)
    • 7:00 PM
      Workshop dinner
    • Morning session
      • 17
        Measurement of Cross Sections and Couplings of the Higgs Boson using the ATLAS Detector

        ATLAS results on cross sections and couplings of the higgs boson will be reviewed. Results from the LHC Run1 will be presented followed by available updates using data from Run 2

        Speaker: Bjarne Stugu (University of Bergen, Norway)
      • 18
        Inclusive hadron production in pp and AA collisions
        Speaker: Yuri Kharlov (IHEP, Protvino)
      • 19
        QCD and Electroweak Measurements with the ATLAS detector
        Speaker: Alexei Ezhilov (PNPI, St.-Petersburg)
      • 11:40 AM
        Coffee break
      • 20
        The general parton distributions (GPDs) and structure of th e hadrons
        Speaker: Oleg Selyugin (JINR, Dubna)
      • 21
        The Effects of Majorana Phases in Estimating the Masses of Neutrinos

        Majorana CP violating phases coming from heavy right-handed Majorana mass matrices (MRR) are considered to estimate the masses of neutrinos.The effects of phases on quasi-degenerate neutrinos mass matrix obeying µ-τ symmetry predicts the results consistent with observations for (i) solar mixing angle(θ12) below TBM, (ii) absolute neutrino mass parameters[mee] in neutrinoless double beta (0νββ) decay, and (iii) cosmological upper bound (summation of neutrinos three masses). Analysis is carried out through parameterization of light left-handed Majorana neutrino matrices (mLL) using only two unknown parameters (ǫ, η) within µ-τ symmetry. We consider the charge lepton and up quark matrices as diagonal form of Dirac neutrino mass matrix (mLR), and mRR are generated using mLL through inversion of Type-I seesaw formula. The analysis shows that the masses of neutrinos are in agreement with the upper bound from cosmology and neutrinoless double beta decay. The results presented in this article will have important implications in discriminating the neutrinos mass models.

        Speaker: Francis Ngouniba Ki (Tezpur University, India)
      • 22
        Lattice QCD at finite baryon density

        New approach to computation of canonical partition functions in Nf = 2 lattice QCD is presented. Results obtained by the new method are compared with results obtained by known method of hopping parameter expansion.
        Results for the number density and canonical partition functions obtained in the confining and deconfining phases at imaginary chemical potential are used to compute physical quantities at the real chemical potential.

        Speaker: Vitaly Bornyakov (IHEP, Protvino)
    • 1:40 PM
      Lunch & rest
    • Evening session
      • 23
        Observing Geometrical Torsion
        Speaker: Stefano Lucat (Utrecht University, Netherlands)
      • 24
        Quartet-metric gravity and dark components
        Speaker: Yury Pirogov (IHEP, Protvino)
      • 4:30 PM
        Coffee break
      • 25
        Superluminal Tunneling of a Relativistic Half-Integer Spin Particle Through a Potential Barrier

        In this talk is presented the problem of a relativistic Dirac half-integer spin free particle tunneling through a rectangular quantum-mechanical barrier. It is supposed that the energy difference between the barrier and the particle is positive and that, within the barrier, the particle behaves like a localized evanescent wave described by the Schrödinger equation. If the barrier width is large enough, there is proof that the tunneling of particle states is always superluminal. For antiparticle states, the tunneling may be either subluminal or superluminal instead, depending on the barrier width. These results derive from studying the tunneling time in terms of phase time. For particle states these are always negatives while for antiparticle states they are always positives, whatever the height and width of the barrier. The scattering also leads to an anomalous distortion of the Dirac spinor (and, consequently, of the density function) that tends to disappear as the particle velocity approaches the speed of light. Moreover, the phase time tends to zero, increasing the potential barrier both for particle and antiparticle states. This agrees with the interpretation of quantum tunneling that the Heisenberg uncertainty principle provides. This study’s results are innovative with respect to those available in the literature since consider the particle within the barrier as an intermediate state where the energy is confined and released like a quantum boom. Moreover, they show that the superluminal behavior of particles occurs in those processes with high-energy confinement and might have relevant implications in cosmology.

        Speaker: Luca Nanni (Zambon S.p.a., Vicenza, Italy)
      • 26
        Summa Summarum
        Speaker: Vladimir Petrov (IHEP, Protvino)
    • 6:00 PM
      Farewell Party