V. I. Rud

The SELEX phototube RICH detector

Abstract In this article, construction, operation, and performance of the RICH detector of Fermilab experiment 781 (SELEX) are described. The detector utilizes a matrix of 2848 phototubes for the photocathode to detect Cherenkov photons generated in a 10 m neon radiator. For the central region an N 0 of 104 cm −1 , corresponding to 13.6 hits on a β =1 ring, was obtained. The ring radius resolution measured is 1.6%.

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.

The E781 (SELEX) RICH detector

Abstract First results from a new RICH detector, operating in an experiment currently taking data – Fermilab E781 (SELEX), are presented. The detector utilizes a matrix of 2848 phototubes for the photocathode. In a 650 GeV/ c π − beam the number of photons detected is 14 per ring, giving a figure of merit N0 of 106 cm −1 . The ring radius resolution obtained is 1.2%. Results showing the particle identification ability of the detector are discussed.

SELEX RICH performance and physics results

SELEX took data in the 1996/7 Fixed Target Run at Fermilab. The excellent performance parameters of the SELEX RICH Detector had direct influence on the quality of the obtained physics results.

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 ++ .

Inelastic\(\bar p\)p interactions at 22.4 GeV/c compared withe+e− annihilation into hadrons

AbstractThe 22.4 GeV/c

Study of ϱ0 meson spin alignment in pp and pp interactions

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