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)).
The inclusive production of resonances is systematically studied in K + p interactions at 32 GeV/ c . Total production cross sections are given for three baryon resonances, five vector and three 2 + tensor mesons. We also compare the central and fragmentation components of the total production cross sections with quark model predictions.
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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.
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We present our final data on the production of the baryons p, Λ, Λ , Σ 0 , Σ 0 , Σ − , Σ + , Ω + , and of the baryon resonances Δ ++ (1232), Σ ∗± (1385), Σ ∗± (1385) in K + p interactions at 70 GeV/ c . Results are given on total and semi-inclusive cross sections, transverse momentum distributions and Feynman- x spectra. The data are compared with measurements at 32 GeV/ c and other energies. The predictions of the LUND fragmentation model for low- p T hadron-hadron collisions are examined and found to offer a reasonably successful description of the data.
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