γproduction inpNe20and

Abstract

Data on the multiplicity and inclusive spectra of y produced in inelastic p ON^ and pN interactions at 300 GeV are presented. The y multiplicity for p ' ONe interactions is 11.43k0.23, and the ratio of ( n , ) for p ''Ne and pN interactions is 1.48f 0.05. From an analysis of the effective-mass distributions, ( n g ) =4.91 to. 52 and ( n ) = 1.47FO. 33. In fact, q0 production is much higher in 71° p ON^ interactions [R (q0/a0)=0.66+0. 12 for n, > 21 than in pN interactions [ R (~~/ T ' ) =0.06f 0.041. No ~' ( 9 5 8 ) signal is seen. Strong correlations between ( n , ) and n,, the number of secondary protons, are observed, primarily from the central and target fragmentation regions. Inclusive y * and p, spectra are analyzed and evidence for low-energy cascading and rescattering of fast particles in the projectile fragmentation region is discussed. The data are compared to the predictions of the additive quark model, the Lund model, and the dual parton model.

Cumulative particle production inpNe20interactions at 300 GeV

“…Data for cumulative y are based on the measurements of 239 y emitted backward in laboratory frame. These y come mostly from ~' -2~ [30].…”

“…The y and VO particles were measured and kinematically analyzed. Events were weighted to account for geometrical efficiency and other losses [29,30]. The neutral stars with n,, ?…”

“…does not exceed 3% of the total number of similar hadrons produced with O" I eIab I 180" [28][29][30][31]33,34]. However, for protons in the momentum interval 0.2 I p p 5 l .…”