Council of the Russian Academy of Sciences (RAS) for the Cosmic Rays comprehensive problem, member of the bureau of RAS Council for Space, and director of the Research Institute of Nuclear Physics (INP) of Lomonosov Moscow State University (MSU), died suddenly on 3 November 2020 at the age of 75. Mikhail Igorevich Panasyuk graduated from the Physical Department of MSU in 1967, and, in 1972, he completed the postgraduate course. That same year, he defended his candidate thesis and in 1988, his doctoral thesis. In 1993, M I Panasyuk was conferred the academic rank of professor. Mikhail Igorevich's whole life was connected with the Research Institute of Nuclear Physics, where he worked for over 50 years, 30 of which as director. M I Panasyuk's scientific interests were concentrated on space physics, namely, ground-based and satellite experiments on space radiation, planet magnetospheres, and cosmic rays. The pioneering Earth satellite experiments carried out with the participation and guidance of M I Panasyuk yielded fundamental scientific results: the possibility of resonance acceleration of ions in Earth's radiation belts affected by quasi-periodic magnetic field fluctuations was proved and the role of radial diffusion of radiation belt particles under the action of electrostatic and magnetic field fluctuations were determined. Priority in these areas was recognized by foreign specialists. The studies, initiated by M I Panasyuk, of magnetospheric ring current responsible for geomagnetic storm generation and of the role of ionospheric oxygen as the main ring current component determining, along with solar plasma protons, geomagnetic storm energy, became widely known throughout the world. M I Panasyuk was the author of unique satellite experiments aimed at investigating anomalous cosmic rays, which led to the discovery of a new phenomenon in nearEarth space, i.e., the formation of Earth's radiation belt consisting of anomalous cosmic ray particles, and to proof of its relation to neutral interstellar gas particles. The international high-altitude balloon experiment in Antarctica for cosmic ray studies in the poorly known energy range (ATIC) was realized under the guidance of M I Panasyuk. He was one of the coordinators of work on the now developed TAIGA projectÐ the international astrophysical observatory near Lake BaikalÐaimed at high-energy cosmic ray and gamma-ray quantum research. M I Panasyuk initiated and developed (with his colleagues) numerous satellite-based space experiments that underlay the space research programs at LomonosovMSU.Among them are the Tatyana-1 (2005) and Tatyana-2 (2009) satellites, which yielded results on extreme phenomena in Earth's atmosphereÐtransient electric discharges in its upper layers. Under his guidance, space experiments were carried out aboard the Vernov satellite (2014) to examine the effect of space radiation on the upper atmospheric layers and to study the dynamics of Earth's radiation belts, as well as the Nuklon experiment for investigating the chemical composition of galactic cosmic rays. M I Panasyuk was research supervisor of experiments aboard a unique astrophysical laboratoryÐ the Russian university satellite Lomonosov (2016). In addition to fundamental space research, M I Panasyuk supervised scientific and applied experiments on space radiation monitoring aboard Russian meteorological satellites in the Meteor, Elektro, Glonass, and Kosmos series and the International Space Station. For his scientific studies, M I Panasyuk was awarded the Prize of the USSRMinistry of Higher and Secondary Special Education (1985) and the M V Lomonosov Prize (1999). He was recognized for excellence (1987) and as an honored worker in higher education in Russia (2005). M I Panasyuk taught in the Physical Department at MSU. From 1992, Professor M I Panasyuk was head of the Uspekhi Fizicheskikh Nauk 191 (3) 331 ± 332 (2021) Translated by M V Tsaplina PERSONALIA PACS number: 01.60.+q

New developments of the CompHEP package and its applications to the top quark and the Higgs boson physics at the LHC collider are reviewed. These developments were motivated mainly by the needs of experimental searches of DO (Tevatron) and CMS (LHC) collaborations where identification of the top quark and the Higgs boson in the framework of the Standard Model (SM) or possible extensions of the SM played an important role. New useful features of the CompHEP Graphics User Interface (GUI) are described.

We discuss the SM Higgs discovery potential of the LHC in the channels pp! H + jet! + jet andpp! H+W=H+t t! + leptonwhen the jet or lepton is observed at sufficiently high pt and a small rapidity to be reliably identified. We calculate all the signal subp rocesses and the irreducible background with realistic kinematical cuts. The reducible QCD background is also estimated. We conclude that the channel +jet can give about 120-200 signal events for Higgs mass MH =100140 GeV at the integrated luminosity of 30fb 1. This signal rate should be compared with only 330-600 events for the irreducible background per two-photon invar iant mass interval of 2 GeV. We estimate the QCD reducible background at the level of < 20% of the irreducible one. Thus, one may hope that the Higgs boson can be discovered already after 1-1.5 years of LH C peration at a low luminosity. At a high luminosity of 10 34 cm 2s 1 the observation of highpt Higgs bosons in this channel will be possible with significance higher than 15 for L 100fb 1. In the channel + lepton only few clean signal events can be expected at low luminosity. However, with an integrated luminosity of 165 fb 1 in both channelspp!W +H andpp! t+ t+H about 100 signal events with less than 20 events of background could be observ ed in the case of low photon transverse momentum cuts pt > 20 GeV. For the high photon transverse momentum cuts pt > 40 GeV about 50 signal events are expected practically free from background.

The top quark and electroweak bosons (W and Z) represent the most massive fundamental particles yet discovered, and as such refer directly to the Standard Model's greatest remaining mystery: the mechanism by which all particles gained mass. This report summarizes the work done within the top-ew group of the Tevatron-for-LHC workshop. It represents a collection of both Tevatron results, and LHC predictions. The hope is that by considering and comparing both machines, the LHC program can be improved and aided by knowledge from the Tevatron, and that particle physics as a whole can be enriched. The report includes measurements of the top quark mass, searches for single top quark production, and physics of the electroweak bosons at hadron colliders.

This Report summarises the activities of the "SM and Higgs" working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005. On the one hand, we performed a variety of experimental and theoretical studies on standard candles (such as W, Z, and ttbar production), treating them either as proper signals of known physics, or as backgrounds to unknown physics; we also addressed issues relevant to those non-perturbative or semi-perturbative ingredients, such as Parton Density Functions and Underlying Events, whose understanding will be crucial for a proper simulation of the actual events taking place in the detectors. On the other hand, several channels for the production of the Higgs, or involving the Higgs, have been considered in some detail. The report is structured into four main parts. The first one deals with Standard Model physics, except the Higgs. A variety of arguments are treated here, from full simulation of processes constituting a background to Higgs production, to studies of uncertainties due to PDFs and to extrapolations of models for underlying events, from small-$x$ issues to electroweak corrections which may play a role in vector boson physics. The second part of the report treats Higgs physics from the point of view of the signal. In the third part, reviews are presented on the current status of multi-leg, next-to-leading order and of next-to-next-to-leading order QCD computations. Finally, the fourth part deals with the use of Monte Carlos for simulation of LHC physics.

A new method for simulating electroweak top-quark production processes is described along with its computer realization in the SingleTop event generator. Special attention is paid to the correct combination of events from two parts of the main t-channel production process: 2 → 2 with a b quark in the initial state and 2 → 3, where an additional b quark appears in the final state. Integration of these two contributions enables the generation of event samples including the first correction to the leading perturbation order, avoiding the double-counting problem and negative-weight events. The SingleTop generator is based on the complete set of the tree Feynman diagrams calculated by the CompHEP package.

The possibility of a nonperturbative description of the π 0 γ*γ, ηγ*γ , and η′γ*γ transition form factors is investigated. The description is performed within the quasipotential approach in the lowest order approximation in the electromagnetic coupling constant. This makes it possible to obtain analytic expressions for these form factors in terms of the corresponding relativistic meson wave functions. The quasipotential wave functions chosen for pseudoscalar mesons in a natural way permit obtaining a quantitative description of present-day experimental data. A comparison of the parameters of the wave functions for π 0 , η , and η ′ mesons demonstrates clearly the relativistic character of quark motion in light mesons.

In the framework of the relativistic independent quark model the parameters of the QCD-motivated static potential and the quark masses are calculated on the basis of the 1−− meson mass spectra. The value of the confining potential coefficient is found to be (0.197±0.005) GeV2 for quark–antiquark interaction independently on their flavours. The dependence of the quasi-Coulombic potential strength on the interaction distance are consistent with the QCD-motivated behaviour. The qq̄-separations are evaluated and the e+e− decay widths are estimated with the help of relativistic modification of the Van Royen–Weisskopf formula.

We describe the interaction of relativistic particles in the framework of the quasipotential approach. The description is based on the so-called covariant single-time formulation of quantum field theory in which the theory is considered on a spacelike three-dimensional hypersurface in the Minkowski space. Special attention is paid to methods for constructing various quasipotentials as well as to use of the quasipotential approach to describe the characteristics of relativistic particle interactions in quark models such as the amplitudes of hadron elastic scattering, the mass spectra and widths of meson decays, and the cross sections of deep inelastic scattering of leptons on hadrons.

CompHEP, as a partonic event generator, and PYTHIA, as a generator of final states of detectable objects, are interfaced. Thus, integrated tool is proposed for simulation of (almost) arbitrary collision processes at the level of detectable particles. Exact (multiparticle) matrix elements, convolution with structure functions, decays, partons hadronization and (optionally) parton shower evolution are basic stages of calculations. The PEVLIB library of event generators for LHC processes is described.

the Department of Physics of Moscow State University, a brilliant scientist and pedagogue, untimely passed away on July 29, 1997 at the age of 44. An alumnus of the Chair of quantum statistics atMoscow State University headed by N N Bogolyubov, Nikita Sveshnikov started his academic activity in his undergraduate years. In his diploma work, and then in his candidate's thesis prepared under the guidance of D V Shirkov, he investigated the problem of infrared divergences in quantum field theory. Such divergences have been known since the 1930s, and acquired special interest in connection with the problem of confinement of quarks in quantum chromodynamics. Sveshnikov was the first to understand that a consistent application of the method of asymptotic dynamics, which exactly describes the processes of interaction of particles at asymptotically large times, to massless models of nonAbelian symmetry, may give rise to non-trivial restrictions on the spectrum of the theory. In a series of works of the late 1970s Ð early 1980s he demonstrated that the model's charge-symmetrical theory does not admit states with nonzero non-Abelian charges, and within the framework of perturbative quantum chromodynamics there are no asymptotic states corresponding to free quarks, which may be interpreted as indication of confinement. In the years to follow, Nikita Alekseevich again and again turned to the problems of infrared divergences, asymptotic dynamics and confinement, and worked on them actively and productively to the last day of his life. An important contribution by Sveshnikov to the quantum theory of gauge fields consisted in the recognition of the role of surface terms and delocalized observables (variables at infinity) in quantum gluodynamics in the Fock ± Schwinger gauge, and in the development of elegant methods of functional integration designed for adequate inclusion of the contribution of the surface effects to the statistical sum, and for studying its dependence on the boundary conditions. This led to an explanation of the mechanism of the confinement ± deconfinement phase transition in SU(N) gluodynamics. He demonstrated that below a critical temperature only a zero value of color charge in any angular cone is statistically realizable. The latter is equivalent to the physical condition of `non-escape' of color in any direction, and is the mathematical expression of the singlet nature of physical observables with respect to the subgroup of gauge transformations at infinity, which in turn ensures fulfillment of Wilson's confinement criterion. The numerical value of a string tension predicted by this model is close to that calculated by the Monte Carlo method. A natural consequence of these works are the results in the theory of jet reactions at high energies obtained in the mid1990s; the linkage of the main class of observables with the energy ±momentum tensor was discovered. It ought to be observed that the supreme mathematical culture of Nikita Alekseevich enabled him to formulate consistent theories in fields previously dominated by semiphenomenological approaches. His supreme mathematical culture was perhaps one of his strongest points Ð one is tempted to think of a genetic predisposition. Sometimes it might even seem that his physics was obscured by mathematics. Such an impression, however, is certainly wrong: the physics for him always came first. The scope of academic interests of Nikita Alekseevich broadened with time, and his extensive erudition and superlative skill allowed him to work simultaneously on pivotal theoretical problems in different branches of physics, and not physics alone: for example, he studied the processes of Uspekhi Fizicheskikh Nauk 168 (1) 109 ± 110 (1998) Translated by A S Dobroslavski|̄ PERSONALIA PACS number: 01.60.+q