Experimental characteristics of the charge-exchange K0 producing reactions in K+p and K-p interactions

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Cross section determination for the reaction K+p → K+pπ+π-π0 and K+π+π+π-n at 8.2 and 16 GeV/c

The cross sections for the reactions: (a) K+p → K+pπ+π-π+ and (b) K+p → K+π+π+π-n have been determined at 8.2 and 16 GeV/c with the following results: at 8.2 GeV/c: (a) 0.99 ± 0.07 mb, (b) 0.41 ± 0.04 mb; at 16 GeV/c: (a) 0.72 ± 0.05 mb, (b) 0.28 ± 0.05 mb. Using the available data at other energies, the cross-section dependence of these reactions on the incident momentum is discussed. © 1976.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Study of the exchange mechanism in K+p → K+π-N*++ at 5 GeV/c incoming K+ momentum

We present results on the analysis of the quasi three-body reaction K+p → K+π-N*++ obtained from bubble chamber exposures at 5 GeV/c incident K+ momentum. We have applied a method of analysis based on the study of the longitudinal phase space plot recently proposed by Van Hove. Evidence for the existence of π- mesons with a four-momentum transfer peaked at small values is shown. (Events contributing to this peak correspond to the cross section of about 80 μb.) The difficulties in explaining this result in terms of the double-particle exchange model are discussed. © 1969.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Double-peripheral model and the four-momentum-transfer distributions in the reaction K+p → K+π-N*++ at 5 GeV/c incoming momentum

We have analyzed the reaction K+p → K+π-N*++ at 5 GeV/c K+ primary momentum, from the point of view of the double-peripheral model. The distributions of four-momentum transfers t′pN* and t′KK (t′=t t ̄tmin) have been studied as functions of the masses of the N*++π- and K+π- systems. We have found that the observed correlations cannot be explained adequately by the present version of the Chan-o{combining short stroke overlay}skiewicz-Allison model. The disagreement is particularly striking for the low N*++π- mass region, where the data show peripheral production of the N*++, contrary to the prediction of the model. The implications of the results for the double peripheral model are discussed. © 1970.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The reactions K+ m ̊p → ΛX++ and K+ p → ΛX++ at incident momenta of 8.2 and 16.0 GeV/c

Inclusive production of Λ and Λ in K+ p interactions is studied at incident momenta of 8.2 and 16.0 GeV/c. Cross sections and single-particle distributions are presented, the correlation between longitudinal and transverse momentum is investigated, and the dependence of average charge multiplicity on missing mass measured. For Λ production, early scaling is observed in the target fragmentation region when the data are presented in terms of (M2-Mth2)/s and t, where Mth is the threshold value of the missing mass M. Furthermore, a triple-Regge analysis in these variable yields an effective exchange trajectory which passes through the K, Q and L mesons. There is evidence for beam fragmentation in Λ and Λ production, but the contributions seem not to be dominant in the fragmentation region. Nevertheless, the parameter values in a triple-Regge description are estimated, and together with those for target fragmentation in Λ production, provide a complete description of the fragmentation contributions to the two reactions. Integration of the resultant distribution functions over the complete Chew-Low plot yields fragmentation cross sections increasing approximately as log s; in addition the observed features of the x, pL and pT2 projections and of the pL-pT correlation are well-described in the fragmentation regions. Central production contributions are isolated by subtracting the calculated fragmentation distributions. © 1976.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A spin-parity analysis of the K+K+K- system produced in the reaction K+p → K+K+K-p

We present the first spin-parity analysis of the K+K+K-) system produced in the reaction K+p → K+K+K-p, and show that the general features of this system resemble those of the (ππ+π-) and Kπ+π-) systems produced in the reactions π(K)p → π(K)π+π-p. There is a low mass enhancement, (47 ± 11)% of which corresponds to 1+ states decaying to Kø. At higher (K+K+K-) masses 2- → Kf′ becomes increasingly significant and at all masses there is a 0- contribution of roughly 30%. © 1975.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Scaling in the semi-inclusive reactions K+p → K♀n (charged) + anything at 5, 8.2 and 16 GeV/c

We study the scaling properties of the semi-inclusive reactions K+p → K0 + n (charged) + X0 (neutral) measuring the momentum spectra of K0-mesons for a given number of prongs n. Distributions of the particle density ω(dσn/dpL)/σn for the inclusive K0 at n = 2 and n = 4 show evidence for limited scaling at 5.0, 8.2 and 16 GeV/c incident K+ momenta. © 1972.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Resonance production in the reaction K+p → K0pπ+ at 5,8.25 and 16 GeV/c

We present a systematic analysis of the production of K*+(892) and Δ++(1236) resonances in the K+p → K0pπ+ reaction at 5, 8.25 and 16 GeV/c. We have measured total cross sections, differential cross sections, density matrix elements and examined resonance production mechanisms in terms of the exchange of states with definite naturality. Some results on the reaction K+p → K*+(1420)p are also given. © 1976.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Study of the reaction K+p→ K*0 (890) Δ++ from 4.6-16.0 GeV/c

A systematic analysis is presented on the reaction K+p→K*0 (890) Δ++ for nine incident momenta between 4.6-16.0 GeV/c. Cross sections, differential cross sections and vector meson single density matrix elements are given. As a function of energy, little if any change is observed in either the shapes of the differential cross sections or in the values of the density matrix elements. The data are interpreted in terms of current ideas on t-channel exchange mechanisms. © 1973.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Inclusive Δ++ production in K+p interactions at 8.2 and 16 GeV/c

The reaction K+p→Δ++(1236)+ anything is studied at beam momenta 8.2 and 16 GeV/c and compared with other Δ++ producing reactions. We find that the low-mass Δ++π- enhancement affects the shapes of Δ++ inclusive distributions. The triple-Regge formula is found to be consistent with the data. Dual properties of this formula are successfully tested. © 1976.SCOPUS: ar.jinfo:eu-repo/semantics/publishe