L. A. Tikhonova

Inclusive ϱ0 production in pp interactions at 22.4 GeV/c

Abstract Inclusive ϱ 0 production has been investigated in p p reactions at 22.4 GeV/ c . The total cross section for ϱ 0 production is 8.1 ± 2.0 mb. The average ϱ 0 s per event is 0.17 ± 0.03. The average transverse momentum, as obtained by extrapolation of a fitted simple exponential to the p T 2 distribution, is 0.52 ± 0.12 GeV/ c . The Feynman x and c.m. rapidity distributions show ϱ 0 to be “centrally” produced.

Experimental verification of the dual unitarization scheme

Abstract The connection between particle production in antiproton-proton annihilation and non-diffractive proton-proton processes is discussed in the framework of the dual unitarization scheme. We calculate relative multiplicity moments for antiproton-proton annihilation using the moments of non-diffractive proton-proton interactions and find good agreement with experimental annihilation data.

Observation of the dependence of the interference effect of identical pions on pion pair velocity in inclusive ¯pp-interactions at 22·4 GeV/c

The Bose-Einstein interference effect is studied using 7333 events of ¯pp-interactions withnch≧6 at 22·4 GeV/c. An essential dependence of the strength of this effect on the pion pair velocity is observed. An indication is obtained that processes with essentially different time characteristics (τ<1 fm and τ>2 fm) contribute to ¯pp-interactions at 22·4 GeV/c. The interpretation based on abundant resonance production in high energy collisions is discussed.

Inclusive production of Δ++ (1236) in pp interactions at 22.4 GeV/c

Abstract The inclusive and semi-inclusive production of Δ ++ (1236) is investigated in p p interactions at 22.4 GeV/ c . The Δ ++ cross section is 1.78 ± 0.18 mb in the region of | t p Δ | ⩽ 0.74 (GeV/ c ) 2 . The differential cross section has been studied as a function of transverse and longitudinal variables. Evidence for the one-pion exchange contribution to the Δ ++ inclusive process has been obtained from the decay angular distributions of the Δ ++ .

Inclusive and semi-inclusive production of positive pions and protons in pp interactions at 22.4 GeV/c

New results on the inclusive and semi-inclusive production of π+ mesons and protons in the whole phase space are given for about 2.2 · 104 inelastic pp interactions at 22.4 GeV/c. A method of statistical separation for spectra of particles of the same charge which are produced in CP-symmetrical reactions is discussed in detail. Experimental data are compared with quark-parton model predictions.

Charge asymmetry at large pT in inelastic pp reactions at 22.4 GeV/c

Charge asymmetry in pp reactions at 22.4 GeV/c is investigated as a function of transverse momentum in the c.m. rapidity interval |y∗| < 1. The charge asymmetries in the forward and backward directions are increasing with increasing transverse momentum. The increase seems to be present both in annihilation and non-annihilation processes.

Inclusive rho0 Production in anti-p p Interactions at 22.4-GeV/c

Abstract Inclusive ϱ 0 production has been investigated in p p reactions at 22.4 GeV/ c . The total cross section for ϱ 0 production is 8.1 ± 2.0 mb. The average ϱ 0 s per event is 0.17 ± 0.03. The average transverse momentum, as obtained by extrapolation of a fitted simple exponential to the p T 2 distribution, is 0.52 ± 0.12 GeV/ c . The Feynman x and c.m. rapidity distributions show ϱ 0 to be “centrally” produced.

Multiplicities and Forward-Backward Correlations in bar pp Interactions at 22.4 GeV/c

We study forward-backward multiplicity correlations in p-interactions at 22.4 GeV/c and discuss multiplicities in a simple two-component picture. When the charged particle multiplicity distribution is divided into even and odd components the probability to produce an odd state is found to be higher than the probability to produce an even state, which may be interpreted to be due to diffraction dissociation. An application of the two-component picture to the forward-backward and to the overall multiplicities is discussed.

Charge Transfer in bar PP Reactions at 22.4 GeV/c

Charge transfer is investigated between c.m. hemispheres and across the largest rapidity gap in an event. The latter method is found to give a larger contribution to zero charge transfer than the former. The rapidity gap size is noted to be bigger for a separation into groups with an odd number of charged particles than into groups with an even number of charged particles. Ordering of produced particles in rapidity in high multiplicity events reveals charge asymmetry and a topology independent charge distribution inside an event.

Azimuthal correlations in

SummaryThe inclusive azimuthal distributions of pion pairs are studies in