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The main properties of high energy diffraction are considered. Plan: 1.Definition Diffraction = elastic scattering caused by the distortion of incoming wave function V.N. Gribov -- "High energy diffraction may be related to confinement since here we deal with the amplitude of high energy particles interaction." Diffractive events is a good place to search for the new physics...
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In this talk, I explore the fundamental nature of pomeron exchanges in high-energy hadronic collisions. Although various unitarization schemes of the elastic scattering amplitude satisfy the S-matrix unitarity constraint, I will argue that rational unitarization—such as the U-matrix, is more optimum for describing QCD processes at high energies than eikonal-like schemes. I will...
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Transition to the reflective scattering mode which has emerged at the highest LHC energy of $\sqrt{s}=13$ TeV results in a relative shrinkage with the energy of the impact parameter region responsible for the inelastic hadron collisions. Respective increasing role of the multiplicity fluctuations of quantum origin is emphasized.
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We study the formation of high-energy deuterons by the coalescence mechanism in ultrarelativistic heavy-ion collisions. We find the coalescence coefficient by calculating the corresponding Feynman diagrams taking into account the coherent nature of the process. We show that the probability of neutron and proton fusion into a high-energy deuteron is higher in the diffraction region...
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The multiplicity distributions of charged particles and their combinants for pp collisions at LHC energies are studied within the Multipomeron Exchange Model (MEM) that takes into account the phenomenon of string fusion. It is shown that the use of Gaussian-type distributions for multiplicity distributions at a fixed number of pomerons allows, within the MEM framework, the...
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Ultra-peripheral collisions at the LHC provide a unique opportunity to study photon-hadron interactions in the new kinematic regime. Recent ALICE results from Run 2 on J/psi photoproduction in ultra-peripheral p-Pb and Pb-Pb collisions provide stringent constraints on gluon saturation effects. ALICE measurements on the coherent rho photoproduction allow for the studies of QCD in the...
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A brief analysis of the development of elastic scattering models in the LHC era is presented and short overview of the results of the model
based on the analyticity of the scattering amplitude with taking into account the hadron structure for high energy hadron elastic scattering
{\rm $pp$, $p\bar{p}$, $pn$, $p\pi$ ($\sqrt{s}=3.6$ GeV up to $\sqrt{s}=13$ TeV ) }. The main...
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https://doi.org/10.1016/j.nuclphysa.2025.123018
Abstract We investigate coherent photoproduction of light vector mesons in Pb–Pb ultraperipheral collisions using the color dipole approach. Our analysis incorporates the Glauber–Gribov formalism with a gluon shadowing correction modeled via an effective suppression factor RG. This factor is fitted to match experimental data from the...
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Physical Review C.104.045202 2. arXiv: 2503.09995
Abstract The photoproduction of Φ and J/ψ meson off the nucleon is investigated within a dynamical model approach based on a Hamiltonian which describes the reaction mechanisms of the Pomeron exchange, meson exchange, and direct Φ- or J/ψ-radiation terms. The final state interaction is described by the gluon-exchange and direct Φ- or...
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https://inspirehep.net/literature/1800744 https://inspirehep.net/literature/1971682 https://inspirehep.net/literature/2756727
Abstract The photons in ultra-peripheral collisions (UPCs) are highly linearly polarized and can be used as probes to test QCD phenomenology, such as nucleon structure. We studied the cos 2ϕ and cos 4ϕ modulations in diffractive vector meson and dijet...
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To study the Higgs boson decay into a proton-antiproton, Z0 -boson, W -boson, quarks et al pairs with large momenta, analytical preparation is performed based on the study of the asymptotic expression for the Higgs-boson at arbitrary angles scattering amplitude in the ladder approximation. To formulate the computational model in the ladder approximation, the Bethe-Salpeter equation...
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Various QCD approaches to the Regge traijectories are briefly reviewed. Nonperturbative and perturbative aspects of the QCD-based approaches to the Regge trajectories are discussed.
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Recent high-energy scattering data reveal that entropy-based observables offer a powerful new lens on the dynamics of hadron structure and particle production. In this talk, I present a unified framework in which scaling entropy derived from charged hadron multiplicity distributions and partonic transverse momentum fluctuations exposes a universal behavior across deep inelastic...
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We consider the general structure of irreducible tensor representations of the Poincare group of arbitrary dimension with multiple sets of Lorentz indices and different ways to construct them from basic elements. Then we apply the same methods to obtain the expansion of general hadronic tensors in terms of these irreducible tensor representations. We propose to use an effective...
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Energy dependence of cross sections, mostly total and elastic, is studied for proton-proton and antiproton-proton collisions. Particularly, the range of very high collision energies larger or about 10 TeV is considered. The interest to that energy domain is driven by the following reasons. The large-scale projects of hadronic colliders of next generation assume the measurements for...
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Recent results of proton-Pb collisions with large forward rapidity gap events at the LHC show a dominant role of photon exchange over pomeron one.
A comparison of LHC proton-proton, proton-nuclear forward rapidity gap events provides an opportunity for the estimation of
A- and Z- dependencies of pomeron- and photon- exchange contributions, respectively.
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Various hadron ”radii” that appear in the literature, e.g.”charge”, ”gravitational”, etc, do not have a direct geometric meaning and do not give an idea of the physical size of a hadron. They, however, can be used to estimate the genuine sizes of hadrons. In the framework of the Gribov-Feynman parton scheme we show that at high enough energy a gluon cloud appears beyond the valence...
