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A. E. Sobol

Publications and source records attributed to A. E. Sobol.

10 recordsLinked to original sources
arXiv2026

A search for the dark photon in the OKA experiment

A search for the massless dark photon in the decay $K^{+}\to π^{+}π^{0}\overline{{} γ}$ is performed with the OKA detector exposed to 17.7 GeV/c RF separated secondary beam of the U70 Proton Synchrotron. A high-statistics data sample of the $K^{+}$ decays is used for a missing mass search of the stable massless invisible dark photon ($\overlineγ$) in the final state. In the absence of a statistically valuable signal the upper limit on the branching ratio of the decay $Br<2.0\times10^{-6}$ is obtained with a 90% confidence level based on a realistic matrix element of the process. Currently, it is the best upper limit for this hypothetical decay channel.

hep-ex↗
arXiv2011

Can We Get Deeper Inside the Pion at the LHC?

We propose a measurement of leading neutrons spectra at LHC in order to extract inclusive $π^+ p$ and $π^+π^+$ cross-sections with high $p_T$ jets production. The cross-sections for these processes are simulated with the use of parton distributions in hadrons. In this work we estimate the possibility to extract parton distributions in the pion from the data on these cross-sections and also search for signatures of fundamental differences in the pion and proton structure.

hep-ph↗
arXiv2011

MonChER: Monte-Carlo generator for CHarge Exchange Reactions. Version 1.1. Physics and Manual

MonChER is a Monte Carlo event generator for simulation of single and double charge exchange reactions in proton-proton collisions at energies from 0.9 to 14 TeV. Such reactions, $pp\to n+X$ and $pp\to n+X+n$, are characterized by leading neutron production. They are dominated by $π^+$ exchange and could provide us with more information about total and elastic $π^+ p$ and $π^+π^+$ cross sections and parton distributions in pions in the still unexplored kinematical region.

hep-ph↗
arXiv2010

Elastic $π^{+}p$ and $π^{+}π^{+}$ scattering at LHC

We discuss the possibility of measuring leading neutron production at the LHC. These data could be used to extract from it $π^+ p$ and $π^+π^+$ cross-sections. In this note we give some estimates for the case of elastic cross-sections and discuss related problems and prospects.

hep-ph↗
arXiv2009

LHC as $πp$ and $ππ$ Collider

We propose an experiment at the LHC with leading neutron production.The latter can be used to extract from it the total $π^+ p$ cross-sections. With two leading neutrons we can get access to the total $π^+π^+$ cross-sections. In this note we give some estimates and discuss related problems and prospects.

hep-ph↗
arXiv2007

EDDE Monte Carlo event generator.Version 2.1

EDDE is a Monte Carlo event generator for different Exclusive and Semi-Inclusive Double Diffractive processes. The program is based on the extended Regge-eikonal approach for "soft" processes. Standard Model and its extensions are used for "hard" fusion processes.

hep-ph↗
arXiv2005

EDDE Monte Carlo event generator

EDDE is a Monte Carlo event generator, under construction, for different Exclusive Double Diffractive Events. The program is based on the extended Regge-eikonal approach for "soft" processes. Standard Model and its extensions are used for "hard" fusion processes. An interface to PYTHIA, CMSJET and CMKIN is provided.

hep-ph↗
arXiv1997

Study of the $ηπ^o$ system in the mass range up to 1200 MeV

The reaction $π^-p \to ηπ^o n$ has been studied with GAMS-2000 spectrometer in the secondary 38 GeV/c $π^-$-beam of the IHEP U-70 accelerator. Partial wave analysis of the reaction has been performed in the $ηπ^o$ mass range up to 1200 MeV. The $a_0(980)$-meson is seen as a sharp peak in S-wave. The $t$-dependence of $a_0(980)$ production cross section has been studied. Dominant production of the $a_0(980)$ at a small transfer momentum $t$ confirms the hypothesis of Achasov and Shestakov about significant contribution of the $ρ_2$ exchange ($I^GJ^{PC}=1^+2^{--}$) in the mechanism of $a_0(980)$ meson production in $t$-channel of the reaction.

hep-ex↗