Leading particles and diffraction dissociation in 150-GeV/cπ−pinteractions

Abstract

Diffraction dissociation of both the beam and target particles has been observed in 150-GeV/c .ir--p interactions in the Fermilab 30-in.-bubble-chamber--proportional-wirechambe hybrid spectrometer. The dissociations are observed as recoil systems opposite leading particles, the signals of which are separated from background where appropriate by a variant of the Van Hove sector cut, thus allowing the high-mass portion of the spectrum to be observed. Pion dissociation has a cross section of 1758-t. 105 pb, divided among two-, four., and six-prong events; some p0 production is seen and comes primarily from the n--t2n-.ir + channel. The proton dissociation cross section is 1726, 100 pb, again divided among two-, four-, and six-prong events. The final state contains a neutron more frequently than a proton in the twoand six-prong events, a proton more frequently in the four-prong events. Production of A + + is observed in the p +p.irf T -dissociations. transferring four-momenhim to other particles,

Inclusive production of charged kaons in p+p collisions at 158 GeV/c beam momentum and a new evaluation of the energy dependence of kaon production up to collider energies

“…2.9 0.00462 0.00082 [5,6] 2.9 0.042 0.00481 [37] 3.45 0.00802 0.00294 [44] 3.59 0.00670 [64] 4.04 0.01760 0.00080 0.00719 [46] 4.9 0.120 0.0190 [41] 4.9 0.0473 0.00747 0.0198 [47] 6.1 0.185 0.0420 [46] 6.8 0.206 0.0410 [41] 6.8 0.0999 0.0330 0.0493 [7] 6.84 0.440 0.120 (0.280) 0.107 0.0262 (0.0666) [49] 7.8 0.300 0.0636 [11] 11.5 0.549 0.322 (0.435) [40] 11.5 0.375 0.109 [50] 13.8 0.121 [51] 13.9 0.505 0.146 [52] 16 [69] 200.0 1.680 0.700 [69] 546.0 2.306 1.000 Table 11: Single differential, p T integrated cross sections F (x F = 0) in mb and total yields for K + , K − and K 0 S for 31 values of √ s. The values in brackets for K 0 S are derived from the cross sections and yields for the charged kaons under the assumption n K 0 S = 0.5( n K + + n K − )…”

“…The s-dependence of K 0 S production and its relation to charged kaons A sizeable number of experiments [39][40][41][42][43][44][46][47][48][49][50][51][52][53][54][55][56][57][58][59] have addressed neutral kaon production from √ s = 3 GeV to √ s = 27.6 GeV. This ensures coverage from close to threshold up to well into the ISR energy range.…”

Quark-gluon string-model description of baryon production in K ± N interactions

“…In this paper we mainly consider the existing experimental data on Λ andΛ production on nucleon target [25]- [30]. We present the comparison of QGSM calculations with the experimental data on spectra and on asymmetry of Λ andΛ hyperons.…”

“…In the present paper we analyse the existing data on spectra and asymmetry of Λ andΛ production on K-beams [25]- [30]. We use the same parametrisations of diquark fragmentation functions to strange baryons and the same Regge trajectory intercepts as in [10,11].…”

Midrapidity hyperon production in pp and pA collisions from low to LHC energies

“…The existing experimental data for the integrated over the whole range of p T energy dependence of p, p, Λ, Λ, and Ξ − , Ξ + hyperons production density dn/dy(| y |≤ 0.5) in pp collisions, from fixed target to LHC energies [52,53,54,55,56,57,58,59,60,61] are compared with the results of the QGSM calculations in Table 2 and in Fig. 5.…”