Issue 4, 2026

P. A. Baikov$^1$, E. E. Boos$^1$, V. E. Bunichev$^1$, S. Yu. Vernov$^1$, I. P. Volobuev$^1$, M. N. Dubinin$^1$, V. O. Egorov$^1$, D. M. Kazarkin$^1$, A. E. Pukhov$^1$, В. И. Саврин$^1$, V. A. Smirnov$^1$, M. N. Smolyakov$^1$, V. E. Tarasov$^1$, E. Yu. Fedotova$^1$

The Department of Theoretical High Energy Physics at the Skobeltsyn Institute of Nuclear Physics conducts extensive research in the field of elementary particle physics, gauge models of quantum field theory, gravity theory and cosmology, as well as lattice nonlocal field theories. The development of multi-loop computing in quantum field theory is of great value for applications of theoretical methods. The original results related to "new physics" beyond the framework of the standard model, inflationary cosmologies and multi-loop calculations are of great value for modern high-energy physics, forming the basis for subsequent applications in the field of elementary particle theory and cosmology.

A. M. Aleshko$^1$, A. V. Berezhnoy$^1$, E. E. Boos$^1$, I. N. Vardanyan$^1$, P. V. Volkov$^1$, G. A. Vorotnikov$^1$, A. V. Berezhnoy$^1$, I. V. Gorelov$^1$, A. M. Gribushin$^1$, L. V. Dudko$^1$, A. A. Ershov$^1$, E. E. Zabrodin$^1$, S. I. Keizerov$^1$, V. I. Klyukhin$^1$, O. Kodolova$^1$, V. L. Korotkikh$^1$, V. A. Kuzmin$^1$, B. B. Levchenko$^1$, I. P. Lokhtin$^1$, O. Yu. Lukina$^1$, A. A. Markina$^1$, D. I. Melikhov$^1$, M. M. Merkin$^1$, M. A. Perfilov$^1$, S. V. Petrushanko$^1$, E. Rakhmetov$^1$, D. V. Savrina$^1$, A. M. Snigirev$^1$, A. N. Solomin$^1$, L. A. Khein$^1$, A. S. Chernyshov$^1$, L. M. Scheglova$^1$, G. H. Eyyubova$^1$

The Department of Experimental High Energy Physics at the Skobeltsyn Institute of Nuclear Physics at Lomonosov Moscow State University conducts comprehensive research in particle physics. The department combines participation in major international collaborations, such as CMS, ATLAS, LHCb, NA64, ZEUS, D0, BM@N, and MPD, with the development of its own theoretical and phenomenological approaches. The department has obtained significant results in its studies of top-quark properties. These results include searches for FCNC processes and anomalous contributions to the Wtb vertex, constraints on SMEFT operators, investigations of Beyond Standard Model scenarios, and the interplay between top-quark physics and dark matter. Advanced machine learning techniques, such as normalizing flows and Kolmogorov–Arnold networks, have been developed and applied to reconstruct invisible particle momenta and analyze spin correlations. The department has also made substantial contributions to detector technologies, including developing and improving the CASTOR calorimeter; creating methods for radiation-field monitoring and hadronic calorimeter calibration in CMS; and designing an mTCA-based electronics monitoring system for HL-LHC conditions. Our theoretical and phenomenological research covers a broad spectrum of subjects, including modeling heavy-ion collisions with the PYQUEN, HYDJET, and HYDJET++ event generators, preparing for data analysis in the MPD experiment at the NICA collider, studying low-energy nucleon-nucleon interactions, and solving the Klein-Gordon equation in rotating and charged black-hole geometries. These results demonstrate the department’s active development of experimental, computational, and theoretical methods and represent a substantial contribution to modern high-energy physics. This work lays the groundwork for future research in particle physics, astrophysics, and cosmology.

V. V. Ternovski$^1$, M. I. Tribelsky$^{2,3}$

A method for solving the two-dimensional problem of electromagnetic radiation scattering by a cluster of an arbitrary number of parallel, infinite, homogeneous, straight, circular, non-intersecting cylinders is proposed. Each cylinder can have arbitrary values ​​of radius and complex permittivity, and their axes, while remaining parallel, can occupy an arbitrary position in space. The solution is based on an analytical expansion of the electromagnetic field in cylindrical harmonics. Multiple scattering is taken into account using Graf's addition theorem, which leads to a linear system of equations for the expansion coefficients. This system is solved numerically with conditionality control and, if necessary, in high-precision arithmetic, followed by multi-stage convergence verification. The method enables obtaining numerically verified solutions with controlled accuracy over a wide range of parameters, including densely packed subwavelength configurations. As an example, the scattering of a plane, linearly polarized, monochromatic wave by a subwavelength cluster of three identical aluminum nanocylinders is studied. The scattering, absorption, and extinction cross sections, as well as the scattering indicatrix, were calculated and analyzed. Field lines of the Poynting vector were constructed. They demonstrate the redistribution of energy flow between the cluster cylinders and the formation of localized regions of field enhancement near their surfaces.

Stabilization of 866 nm laser frequency with optical confocal Fabry–Perot transfer сavity

S. Yu. Zarutskiy$^1$, A. O. Kadykov$^{1,2}$, A. N. Matveev$^1$, A. P. Chuev$^{1,2}$, K. E. Lakhmanskiy$^1$

We present a scheme suitable for a simultaneous stabilization of multiple lasers using a custom confocal Fabry-Perot cavity. We demonstrate a stability transfer from the Nd:YAG 532 nm frequency standard, locked to the I2 molecular iodine cell, to the 866 nm external-cavity diode laser (ECDL). We achieve a frequency stability over the duration of 50 minutes, with an overall frequency drift of 500 kHz, which is 0.02 of the natural linewidth of the corresponding transition in ion 40Ca+. The achieved results allow us to use the described setup for the future implementation of a trapped calcium ion quantum computer.

L. G. Kuznetsov, N. I. Pyshkov, S. E. Svyakhovskiy

A method of controlled local laser oxidation of porous silicon-based photonic crystals is presented. The process of thermal oxidation of photonic crystals by pulsed and continuous laser radiation is experimentally studied. The dependence of the spectral shift of the photonic band gap on the laser radiation power and processing time is investigated. The possibility of local oxidation according to a given pattern is demonstrated.

V. L. Lyaskovskii

Quantum information systems, such as quantum computers and quantum cryptography systems, have been actively developed recently. In such systems , pulses of optical radiation are used to perform computational and measurement tasks., consisting of a small number of photons. To reduce the geometric dimensions of measuring, computing and communication optoelectronic devices, microchips created using planar technologies are used. Planar technologies make it possible not only to reduce the size of devices, but also to increase their production volume by forming a large number of optical chips in one production process, for example, using photolithography. To control optical radiation, including low-intensity, optical microcircuits include such separate passive optical elements as photonic crystals, optical microresonators, fiber-optic splitters and multiplexers connected by waveguides. Since these elements are created in the same production process and form a single optical circuit, then in the process of debugging or defining features The operation of the microcircuit may require measuring the optical parameters of individual elements of such microcircuits. The present work is devoted to the study of the process of measuring the spectral parameters of individual elements of optical microcircuits manufactured using planar technology. When measuring spectral parameters, it is proposed to apply the substrate of the microcircuit of temporary optical fibers by ion deposition. A photonic silicon oxide crystal formed on a silicon substrate by precipitation of silicon dioxide from a gaseous precursor with an ion beam was chosen as the optical element under study. The geometric parameters of the photonic crystal are calculated in such a way as to obtain the band gap of the photonic crystal in the range of 530-560 nm. Two planar light guides have been formed to measure the band gap of a photonic crystal on a silicon substrate by ion deposition. Broadband radiation was supplied to the studied photonic crystal through planar light guides. In the measured transmission spectra, an absorption band in the wavelength range is recorded, which corresponds to the parameters specified during the calculation of the photonic crystal. Thus, it is shown that it is possible to carry out selective or control measurements of the parameters of the elements of optical microcircuits, after they are applied to the substrate, by feeding optical radiation through temporary optical fibers that can be removed after measurements are performed. The results of this work demonstrate the possibility of using temporary optical waveguides formed by ion deposition to control the optical parameters of photonic crystals and other elements of optical microcircuits.

I. E. Stepanova$^1$, I. I. Kolotov$^2$, A. V. Shchepetilov$^2$, A. N. Levashov$^2$

The local and regional versions of the linear integral representation method proposed is implemented for the interpretation of anomalous time-dependent field data. The reconstruction of the field elements is reduced to solving linear algebraic equation system with the approximately given right-hand side. The results of the non-stationary gravity c field modeling are given.

E. M. Zarkova$^{1,2}$, D. E. Larin$^2$

Polymer brushes are a class of modifiers that enable control over surface properties depending on the chemical composition of the grafted macromolecules and external conditions. This paper examines planar polymer brushes consisting of amphiphilic comb-like copolymers, which comprise a hydrophobic backbone, to each monomer unit of which hydrophobic groups are attached, and regularly distributed hydrophilic (polar) side groups, in the case of their very dense grafting onto an impermeable inert surface. Within the framework of mean-field theory, a theoretical model of self-assembly in an amphiphilic polymer brush was developed. Phase diagrams were constructed for variations in the copolymer’s molecular parameters and grafting density. The diagrams include regions of existence of cylindrical aggregates, lamellae, a porous layer, and a homogeneous brush. It was found that in the region of high solubility of polar groups, a re-entrant transition «homogeneous brush → cylindrical aggregates → homogeneous brush» occurs as the grafting density increases. The obtained results are compared with data from the literature.

P. A. Spirin

We consider problems related with appearance and usage of the three-dimensional zero-range potential which interacts with the massless scalar field: namely, the construction of exact Hadamard functions and a problem of vacuum polarization. The solution to these problems implies the renormalization of bare delta-potential's coupling $\lambda$ into the finite $\lambda_{\ren}$. The renormalized Hadamard functions of the massless real-valued scalar field ~$\phi$ are presented in a form of single-variable integral. The latter is Riemannian as $\lambda_{\ren}<0$ and the Cauchy-integral as $\lambda_{\ren}>0$. With help of The renormalized Hadamard function the vaccum-average $\langle \phi^2\rangle$ is computed in a form of the integral exponential.

A. V. Tikhonravov$^1$, S. A. Sharapova$^1$, S. K. Kirpichenko$^2$

A new monochromatic monitoring strategy is presented, focused on the use of modern monitoring equipment with online correction of termination levels during layers deposition. The new strategy aims to minimize the number of monitoring wavelength switches during the coating deposition process, which is a critical manufacturing requirement. The presented example demonstrates the creation of a monitoring spreadsheet, describing the practical application of the new strategy in the production of a modern optical filter.

V. T. Voronchev, V. N. Pomerantsev

Analytical formulas are found for matrix elements of operators like pair projectors (e.g., Pauli projectors) for a three-bode system when using a multidimensional Gaussian basis, including symmetrized one. Expressions for the overlap of three-bode basis functions and a given function of particle pair are presented. A method for projecting two-body central potentials in a threebody system on a certain orbital state is also considered. The results can be used in variational calculations of three-body systems in nuclear, atomic, and molecular physics.

M. A. Simdyanova, A. B. Granovsky

Within the framework of Maxwell's equations and the Boltzmann kinetic equation, expressions for the Faraday rotation of ferromagnetic metal films in the terahertz region of the spectrum are obtained. It is shown that, with the dominant mechanism of asymmetric scattering of the anomalous Hall effect, the Faraday rotation has a square root frequency dependence and can reach values of 102 rad/cm. A comparison of magneto-optical effects in the terahertz region of the spectrum on reflection and transmission is presented.

A. Yu. Sosorev$^1$, S. N. Korchkova$^2$

For efficient practical application of organic field-effect transistors, the organic semiconductors constituting their active layers should combine high charge mobility with decent operational stability; light-emitting transistors should also show efficient luminescence. In this study, we suggest three novel derivatives of the popular organic semiconductor Ph-BTBT-C10 with oxygen atoms inserted into decyl substituent and/or as a part of methoxy group at phenyl ring, and investigate the suggested compounds using DFT calculations. It is shown that such a modification of chemical structure affects the torsional angle between the phenyl ring and the BTBT core, rises the energy levels of frontier molecular orbitals, lowers the S0-S1 transition energy and enhances the corresponding oscillator strength, increases the static dipole moment and makes the electrostatic potential more inhomogeneous. The molecules suggested are expected to show more efficient luminescence and stronger intermolecular interactions, which should positively affect the stability of oranic (opto)electronic devices. We anticipate that the revealed structure-property relationships for the organic semiconductors investigated will facilitate the rational design of these materials.

A. V. Bernatskiy$^1$, I. I. Draganov$^{1,2}$, V. V. Lagunov$^1$, A. J. Sadurni Sorokin$^{1,3}$, V. N. Ochkin$^1$

In a discharge with a rectangular hollow cathode and a mesh anode, three-dimensional spatial measurements of the electron concentration were performed. The measurement region significantly exceeded the discharge aperture, including the space behind the anode. It was found that a considerable electron concentration is observed in the region behind the anode. The effect of electrons bypassing the anode is observed along its entire surface.

B. P. Yakimov$^1$, A. S. Snigireva$^1$, A. A. Rubekina$^1$

Near-infrared autofluorescence (NIRAF) of biological tissues is traditionally regarded as a background signal in Raman spectroscopy; however, its diagnostic potential and molecular origins remain poorly understood. This study presents a quantitative analysis of an open-access dataset of Raman and NIRAF spectra from human skin measured \textit{in vivo} with 785 nm excitation. We show that NIRAF intensity is statistically significantly higher in patients with type 2 diabetes than in healthy volunteers and correlates with glucose and glycated hemoglobin levels. No dependence on age, body mass index, or gender is observed. Using model systems, we demonstrate that protein oxidation and glycation products, which exhibit broad absorption and fluorescence spectra, may contribute to skin NIRAF. These findings indicate the potential of NIRAF as a noninvasive marker of metabolic disorders associated with oxidative stress and hyperglycemia.

A. A. Larionov, O. P. Yushchenko

As part of the establishment of the ion beam therapy center at the National Research Center "Kurchatov Institute IHEP is developing a planning system for ion beam therapy. The planning system relies, in particular, on fast Monte Carlo methods, which provide high computational speed and accuracy comparable to standard Monte Carlo packages (e.g., GEANT4). This paper presents a practical method for fast computation of ionization loss and ion propagation in complex media, which is implemented in the ion beam therapy planning system under development.