150 research outputs found
Charged rho meson production in neutrino-induced reactions at E_nu = 10 GeV
The neutrinoproduction of charged mesons on nuclei and nucleons is
investigated for the first time at moderate energies ( 10
GeV), using the date obtained with SKAT bubble chamber. No strong nuclear
effects are observed in and production. The fractions of
charged and neutral pions originating from decays are obtained and
compared with higher energy data. From analysis of the obtained and available
data on and (892) neutrinoproduction, the strangeness
suppression factor in the quark string fragmentation is extracted: . Estimations are obtained for cross sections of quasiexclusive
single and coherent neutrinoproduction on nuclei. The
estimated coherent cross section = (0.29 cm is compatible with theoretical predictions.Comment: 7 pages, 6 figure
A study of the double hadron neutrinoproduction on nuclei
The nuclear medium influence on the dihadron neutrinoproduction is
investigated for the first time, using the data obtained with SKAT bubble
chamber. An indication is obtained that the nuclear attenuation of the dihadron
is more expressed for kinematically closest hadron pairs. The experimental data
on the dihadron attenuation and on the ratio of the dihadron to single-hadron
yields are compared with predictions of the two-scale string fragmentation
model.Comment: 5 pages, 10 figure
Charm and bottom production in inclusive double Pomeron exchange in heavy ion collisions at the LHC
The inclusive double Pomeron exchange cross section for heavy quark pair
production is calculated for nucleus-nucleus collisions at the LHC. The present
estimate is based on hard diffractive factorization, corrected by absorptive
corrections and nuclear effects. The theoretical uncertainties for nuclear
collisions are investigated and a comparison to other approaches is presented.
The production channels producing a similar final state configuration are
discussed as well.Comment: 7 pages, 3 tables. Final version to be published in Physical Review
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
The yields of light meson resonances in neutrinonuclear interactions at <E_nu> = 10 GeV
The total yields of the all well-established light mesonic resonances (up to
the (1020) meson) are estimated in neutrinonuclear interactions at < E_nu
> = 10 GeV, using the data obtained with SKAT bubble chamber. For some
resonances, the yields in the forward and backward hemispheres in the hadronic
c.m.s. are also extracted. From the comparison of the obtained and available
higher-energy data, an indication is obtained that the resonance yields rise
almost linearly as a function of the mean mass of the neutrinoproduced
hadronic system. The fractions of pions originating from the light resonance
decays are inferred.Comment: 15 pages, 7 figure
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