We present data on the production of the baryons Λ,\(\bar \Lambda \),p and of the baryon resonances Σ*+ (1385) and Δ++ (1232) inK+p and π+p interactions at 250 GeV/c. Results are given on total and semi-inclusive cross sections, Feynman-x spectra, transverse momentum distributions and Λ polarization. The data are compared with measurements at lower energies, with deep inclastic lepton nucleon data and with predictions of quark-parton models. The models underestimate Λ production in the central c.m. region, a feature also seen in recent heavy-ion data. This failure can be cured in JETSET 6.3 by adjustment of the di-quark break-up probability.
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Axis error includes +- 0.0/0.0 contribution (?////RES-DEF(RES=DEL++,BACK=CORRECTED,DEF=1.08 < M(P PI+) < 1.8 GEV)//RES-DEF(RES=SIG(1385P13)+-,BACK=CORRECTED,DEF=1.26 < M(LAMDA PI+-) <2.0 GEV)//RES-DEF(RES=ASIG(1385P13)+-,BACK=CORRECTED,DEF=1.26 < M(ALAMDA PI+-) < 2.0< GEV)).
Axis error includes +- 0.0/0.0 contribution (?////RES-DEF(RES=DEL++,BACK=CORRECTED,DEF=1.08 < M(P PI+) < 1.8 GEV)//RES-DEF(RES=SIG(1385P13)+-,BACK=CORRECTED,DEF=1.26 < M(LAMDA PI+-) <2.0 GEV)//RES-DEF(RES=ASIG(1385P13)+-,BACK=CORRECTED,DEF=1.26 < M(ALAMDA PI+-) < 2.0< GEV)).
Axis error includes +- 0.0/0.0 contribution (?////RES-DEF(RES=DEL++,BACK=CORRECTED,DEF=1.08 < M(P PI+) < 1.8 GEV)//RES-DEF(RES=SIG(1385P13)+-,BACK=CORRECTED,DEF=1.26 < M(LAMDA PI+-) <2.0 GEV)//RES-DEF(RES=ASIG(1385P13)+-,BACK=CORRECTED,DEF=1.26 < M(ALAMDA PI+-) < 2.0< GEV)).
We have studied the inclusive production of K*±(890) and Y*±(1385) in pp, π+p, and K+p interactions at 147 GeV/c. The experiment used the Fermilab 30-inch hydrogen bubble chamber with the hybrid spectrometer system. Results are based on a sample of 1916 observed KS and 932 observed A. Inclusive cross sections are given for K*± and Y*± production from the three beams, and comparisons are made with experiments at other energies. Feynman-x and transverse-momentum-squared distributions are also calculated. The results suggest that the K*− is entirely produced in the central region, while the K*+ includes a component from beam fragmentation. Comparisons are made with the additive quark model.
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Results are presented on inclusive production of resonant and non-resonant particle systems produced inK+p interactions at 32 GeV/c. We compareK*+(892),\(\bar \Sigma ^{ *- } \)(1385), Σ*±(1385), and ϱ0 inclusivex-spectra with the ones of non-resonantKs0π±,\(\bar \Lambda \pi ^ -\), Λπ± and π+π− pairs at the same effective mass. Resonance-particle pairsK*+π±, Σ*+π−, and\(\bar \Sigma ^{ *- } \pi ^ -\) are also studied together with non-resonant tripletsKs0π±, Λπ+π−,\(\bar \Lambda \pi ^ -\pi ^ -\). The invariantx-spectra of resonant particle pairs decrease less rapidly withx then the corresponding non-resonant pairs. Comparison with quark-recombination predictions indicates that the particles, resonances and multiparticle systems are probably created off a single valence quark or diquark instead of carrying all possible valence-quarks.
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