4,243 research outputs found
From the first observations of cosmic rays to the physics of relativistic nuclei
Research of cosmic rays at the Physical Institute of the USSR Academy of
Sciences resulted in the construction of the JINR Synchrophasotron. For this
purpose the Electrophysical Laboratory of the USSR Academy of Sciences was
founded in 1953, which became part of JINR in 1956 as the High Energy
Laboratory. The initial milestones to develop experiments at the Laboratory on
the Synchrophasotron are presented. Leaders and key participants in the
experiments are highlighted, as well as the lessons and results relevant today.Comment: To be published in Proceedings of https://indico.jinr.ru/event/3694/
(PEPAN/EChAYa
Coherent and Non-Coherent Double Diffractive Production of - pairs in Collisions of Heavy Ions at High Energies
The double coherent and non-coherent diffractive production of heavy quark -
antiquark pairs () in heavy ion scattering at high energies (LHC) is
considered. The total and differential cross sections of these processes with
the formation of and pairs in , and
collisions are evaluated. The contribution of the considered mechanisms is a
few per cent of the number of heavy quark - antiquark pairs obtained in the
processes of hard (QCD) scattering, and it will be taken into account in the
registration of , quarks or, for instance, in the study of the heavy
quarkonia suppression effects in Quark - Gluon Plasma, in the search for
intermediate mass Higgs bosons and so on. It is shown that the cross section of
the coherent scattering process is great enough. This makes it suitable for
studying collective effects in nuclear interactions at high energies. An
example of such effects is given: large values of the invariant mass of a pair, M_{Q \bar{Q}} \gsim 100 GeV, in association with a large
rapidity gap between diffractive jets .Comment: 22 pages, 5(.eps) figures, 3 tables, LaTe
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