arXiv subjects

O. V. Selyugin

Publications and source records attributed to O. V. Selyugin.

At least 19 recordsLinked to original sources

arXiv2026

Elastic Hadron Scattering at High Energies

A brief historical overview of various modern approaches to the problem under consideration is given. It includes existing models based on a sum of different terms of the scattering amplitude with different signs and Regge-eikonal models based on the Born terms of the scattering amplitudes. An example of such a model is a new Regge-eikonal model is given, taking into account the generalized structure of nucleons (the HEGS model), which is based on the analyticity of the scattering amplitude. A unified quantitative description of various hadron reactions and a description of differential cross sections and the spin-correlation parameter for interactions were obtained. In the framework of the model, the existence of experimental data of elastic hadron scattering in the energy range of LHC and in a wide energy region $\sqrt{s}=3.6 -13000$ GeV was describe a quantitatively from a unified point of view. The predictions for $σ_{tot}(s)$ at superhigh energies are presented. The possible thin structure of differential cross sections at small angles of elastic nucleon-nucleon scattering at high energies is discussed.

hep-ph↗

arXiv2025

Relations of meson and nucleon electromagnetic and gravitational radii with quarks and gluons contributions

The electromagnetic and gravitational form factors of the nucleon determined by quark and gluon contributions are calculated using the momentum transfer dependence of generalized parton distributions with different forms of parton distribution functions obtained by various Collaborations. The power forms of gravitational form factors of quarks and gluons are examined. It is shown that the gluon gravitational radius of the nucleon is comparable to the electromagnetic radius of the proton; however, the quark gravitational radius of the nucleon is less than its electromagnetic radius. It is shown that the gluon gravitational form factor drops faster than the quark gravitational form factor at large transfer momenta and corresponds to the triple form.

hep-ph↗

arXiv2024

Elastic scattering at $\sqrt{s} = 6$ GeV up to $ \sqrt{s} = 13$ TeV (proton-proton; proton-antiproton; proton-neutron)

In the framework of the Regge-eikonal model of hadron interaction based on the analyticity of the scattering amplitude with taking into account the hadron structure, a simultaneous analysis is carried out of 90 sets of data. These sets include the data were obtained at low energies ($\sqrt{s} > 3.6 $ GeV and high energies at FNAL, ISR, $SP\bar{P}S$, TEVATRON and LHC with 4326 experimental points, including the data of $A_N$. The energy and momentum transfer dependence of separate sets of data is analyzed on the basis of the eikonalized Born amplitude with taking into account two additional anomalous terms. Different origins of the nonlinear behavior of the slope of the scattering amplitude are compared. No contribution of hard-Pomeron in the elastic hadron scattering is found. The importance of Odderon's contribution is presented. In the framework of the HEGS model, using the electromagnetic and gravitomagnetic form factors, the differential cross sections in the CNI region and at large $t$ are described well in a wide energy region simultaneously. It is shown that the cross-even part includes the soft pomeron and the additional term with a large slope have energy dependence $\ln^2(s)$. The cross-odd part includes the maximal odderon term with $\ln^{2}(s)$ and an additional oscillation term with $\ln(s)$. It is shown that the additional terms with large slope are proportional to charge distributions but the maximal odderon term and oscillation term are proportional to matter distributions. Also, a good description of proton-neutron differential scattering with 526 experimental points is obtained on the basis of the amplitudes taken from the analysis of $pp$ and $p\bar{p}$ scattering. A good description of the $A_N$ data was also obtained.

hep-ph↗

arXiv2024

Dependence of the structure of the elastic scattering amplitude on Mandelstam variables at high energies

Analysis of new experimental data obtained by the TOTEM and ATLAS Collaborations at the LHC together with old data obtained at the SPS and Tevatron colliders at small momentum transferin the framework of the high energy generalized structure (HEGS) model allows one to determine the dependence of different parts of the hadron elastic scattering amplitude on the mandelstam kinematic variables the $s$ and $t$

hep-ph↗

arXiv2024

New properties of elastic $pp$ and $p\bar{p}$ scattering at high energies

Data-driving determination of the new properties of elastic scattering at small angles on the basis on all existing experimental data for $dσ/dt$ of $pp$ and $p\bar{p}$ at $\sqrt{s} \geq 540$ GeV allows us to obtain the main characteristics of the nonstandard terms of the elastic scattering amplitude. It was shown that the oscillation term has a different sign for $pp$ and $p\bar{p}$ reactions; hence, it is part of the Odderon amplitude. The energy dependence of the oscillation term and the term with an extremely large slope is determined. The period of the oscillation term agrees with the scaling properties predicted by the Auberson - Kinoshita - Martin (AKM) theorem. The high quality quantitative description of all data at $\sqrt{s} \geq 540$ GeV in the framework of the HEGS model supports such a phenomenon which can be connected with peripheral hadron interaction.

hep-ph↗

arXiv2024

GPDs and gravitational form factors of nucleons (quark and gluon contributions)

Taking into account the recent parameterizations of parton distribution functions (PDFs), % obtained in the recent time, the momentum transfer dependence of generalized parton distributions (GPDs) of nucleons is obtained in the limit $ξ\rightarrow 0$. The gravitational quark and gluon form factors of nucleons are calculated. It is shown that the gluon gravitational radius of the nucleon is comparable to the electromagnetic radius of the proton. The power dependence of form factors is investigated. As a result, it was obtained that the quark gravitational form factor is reproduced by the dipole form, while the form of the gluon gravitation form factor corresponds to the triple form.

hep-ph↗

arXiv2023

Relative contributions of cross-even and cross-odd parts to the spin dependent elastic hadron scattering amplitudes at high energies

The form and energy dependence of different terms of the cross-even and cross-odd parts of the elastic nucleon-nucleon scattering amplitude is determined in the framework of the High Energy Generalize Structure (HEGS) model. In the framework of the HEGS model, using the electromagnetic and gravitomagnetic form factors, the differential cross sections in the Coulomb Nuclear Interference (CNI) region and at large momentum transfer are described well in a wide energy region simultaneously. It is shown that the cross-even part includes the soft pomeron growing like Log(s)2 and an additional term with a large slope and with Log(s) growth. The cross-odd part includes the maximal odderon term and an additional oscillation term Log(s) growth. It is shown that both additional terms are proportional to charge distributions, but the maximal odderon term is proportional to matter distributions

hep-ph↗

arXiv2023

New features in the differential cross sections measured at the LHC

The critical analysis of the new experimental data obtained by the ATLAS Collaboration group at 13 TeV is presented and the problem of the tension between data of the ATLAS and TOTEM Collaboration is considered. The analysis of new effects discovered on the basis of experimental data at 13 TeV \cite{osc13,fd13} and associated with the specific properties of the hadron potential at large distances is carried out taking account of all sets of experimental data on elastic $pp$-scattering obtained by the TOTEM and ATLAS Collaborations in a wide momentum transfer region. It also gives quantitative descriptions of all examined experimental data with a minimum of fitting parameters. It is shown that the new features determined at a high statistical level give an important contribution to the differential cross sections and allow the research into hadron interactions at large distances.

hep-ph↗

arXiv2022

Anomalies in the differential cross sections at 13 TeV

Analysis of differential cross sections of the TOTEM Collaboration data, carried out without model assumptions, shows the existence of new effects in the behavior of the hadron scattering amplitude at a small momentum transfer at a high confidence level. The quantitative description of the data in the framework of the high energy generalized structure (HEGS) model supports such a phenomenon that can be associated with the specific properties of the hadron potential at large distances. It is shown that the value of $ρ(s,t)$ at $\sqrt{s}=13$ TeV and small $t$ exceeded $0.1$.

hep-ph↗

arXiv2021

GPDs of hadrons and elastic pion-nucleon scattering

The pion structure is represented by Generelazed parton distribution functions (GPDs). The momentum transfer dependence of GPDs of the pion was obtained on the basis of the form of GPDs of the nucleon in the framework of the high energy generalized structure (HEGS) model. To this end, different forms of PDFs of the pion of various Collaborations were examined with taking into account the available experimental data on the pion form factors. As a result, the electromagnetic and gravitomagnetic form factors of the pion were calculated. They were used in the framework of the HEGS model with the electromagnetic and gravitomagnetic form factors of the proton for describing pion-nucleon elastic scattering in a wide energy and momentum transfer region with a minimum of fitting parameters. The properties of the obtained scattering amplitude were analyzed.

hep-ph↗

arXiv2021

Anomaly in the differential cross sections at 13 TeV

The analysis of the new TOTEM data at 13 TeV in a wide momentum transfer region reveals the unusual phenomenon - the presence in the elastic scattering amplitude of a term with a very large slope that is responsible for the behaviour of hadron scattering at a very small momentum transfer. This term can be connected with hadron interactions at large distances.

hep-ph↗

arXiv2021

Nucleon structure and spin effects in elastic hadron scattering

Soft diffraction phenomena in elastic nucleon scattering are considered from the viewpoint of the spin dependence of the interaction potential. Spin-dependent pomeron effects are analyzed for elastic $pp$ scattering, spin-dependent differential cross sections and spin correlation parameters are calculated. The spin correlation parameter $A_N$ is examined on the basis of experimental data from $\sqrt{s} = 4.9 \ GeV$ up to $23.4 \ $GeV in the framework of the extended High Energy Generalized Structure (HEGS) model. It is shown that the existing experimental data of proton-proton and proton-antiproton elastic scattering at high energy in the region of the diffraction minimum and at large momentum transfer give the support of the existence of the energy-independent part of the hadron spin flip amplitude.

hep-ph↗

arXiv2021

Possible studies at the first stage of the NICA collider operation with polarized and unpolarized proton and deuteron beams

This paper contains suggestions for experiments with usage of the Spin Physics Detector (SPD) at the first stage of the SPD NICA Programme developing at JINR. Double polarized pp-, dd- and pd- collisions at c.m.s. NN energies of 3.4-10 GeV, which will be accessible at the initial stage of experiments, allow one to study spin dependence of the NN interaction, search for multiquark states at double strangeness, charm and beauty thresholds, study the short-range structure of the deuteron. Double polarized pd scattering offer a possibility to test the Standard Model through the search for T-invariance violation.

hep-ph↗

arXiv2020

Hadron structure and spin effects in elastic hadron scattering at NICA energies

The spin effects in the elastic proton-proton scattering are analysed at NICA energies. It is shown the importance the investigation of the region of the diffraction minimum in the differential cross sections. Some possible estimation of spin effects are given for the different NICA energies in the framework of the new high energy generelazed structure (HEGS) model.

hep-ph↗

arXiv2020

New feature in the differential cross sections at $13$ TeV be measured at the LHC

Analysis of $dσ/dt$ of the TOTEM Collaboration data, carried out without model assumptions, showed the existence of a new effect in the behavior of the hadron scattering amplitude at a small momentum transfer at a high confidence level. The quantitatively description of the data in the framework of the HEGS model support such phenomenon which can be connect with quark potentials at large distances.

hep-ph↗

arXiv2019

Electromagnetic and gravitomagnetic structure of pions and pion-nucleon scattering

Taking into account PDFs obtained by various Collaborations, the momentum transfer dependence of GPDs of the pion are obtained. The calculated electromagnetic and gravitomagnetic form factors of the pions and nucleons are used for the description of the pion-nucleon elastic scattering in a wide energy and momentum transfer region with minimum fitting parameters.

hep-ph↗

arXiv2019

Electromagnetic and gravitomagnetic structure and radii of nucleons

Taking into account the PDFs, obtained by different Collaborations, the momentum transfer dependence of GPDs of the nucleons is obtained. The calculated electromagnetic and gravitomagnetic form factors of nucleons are used for the description of different form factors and the nucleons elastic scattering in a wide energy and momentum transfer region with a minimum number of fitting parameters. The electromagnetic and gravitomagnetic radii of the nucleon are calculated using the obtained momentum transfer dependence of GPDs with different forms of PDFs obtained by different Collaborations. The comparison of the calculations, taking into account the PDFs obtained by different Collaborations, of mean square electromagnetic and gravitomagnetic radii of nucleons is made.

hep-ph↗

arXiv2019

TOTEM data and the real part of the hadron elastic amplitude at 13 TeV

We analyse the 13 TeV TOTEM data on elastic proton-proton scattering through a thorough statistical analysis, and obtain that $ρ=0.096\pm 0.006$ and $σ_{tot}=(107.5\pm 1.5)$ mb. Theoretical errors could lower the cross section by about 2 mb and increase $ρ$ by about 0.002. We also show that these results do not imply the existence of an odderon at $t=0$.

hep-ph↗