L. Pape

Inclusive V0 production in pp interactions at 12 GeV/c

Results are presented on the inclusive reactions pp → K0X, pp → ΛX and pp → ΛX at an incident antiproton momentum of 12 GeV/c in BEBC. The cross sections are studied as functions of the Feynman scaling variable x, the rapidity, the transverse momentum of the V0 and the missing mass squared. The dependence of the Λ and Λ polarization on x are also studied. Comparisons with proton-proton data at 12 GeV/c are also made. Finally, events with two detected V0 are analyzed in order to study correlations arising from the production of two strange neutral particles.

Inclusive production of K*(890), Σ(1385) and S*(993) resonances in pp interactions at 12 GeV/c incident momentum

The reactions pp→K*(890)X, pp→Σ±(1385)X and pp→S*(993)X at 12 GeV/c incident momentum have been studied using 19 000 events with a visible V0 decay in BEBC. Inclusive production cross sections of these resonances as a function of transverse momentum and rapidity are presented. The contribution of annihilation to the production of the K*(890) is investigated from a comparison with the corresponding pp data.

Evidence for a narrow peak in Ksoπ±π+π- at 2.6 gev in 12 gev/ cpp interactions

Abstract We report the evidence for a narrow charged peak (5.5 s.d.), which we suggest calling the I, in the 6-prong-V 0 topology of p p interactions at 12 GeV/ c . The mass, widht and the product of cross section σ I times the branching ratio BR into the final state (K s o τ±τ + τ − are found to be: M I =2.60 ± 0.01 GeV / c 2 , Γ I ⩽ 0.018 GeV / c 2 , σ I ·BR≈20 μbarn

Inclusive V0 Production in anti-p p Interactions at 12-GeV/c

Results are presented on the inclusive reactions pp → K0X, pp → ΛX and pp → ΛX at an incident antiproton momentum of 12 GeV/c in BEBC. The cross sections are studied as functions of the Feynman scaling variable x, the rapidity, the transverse momentum of the V0 and the missing mass squared. The dependence of the Λ and Λ polarization on x are also studied. Comparisons with proton-proton data at 12 GeV/c are also made. Finally, events with two detected V0 are analyzed in order to study correlations arising from the production of two strange neutral particles.

A search for charmed particle production in pp interactions at 12 GeV/c

A search for charmed particles (D mesons, D* mesons and λc baryons) produced in pp interactions at 12 GeV/c incident beam momentum has been carried out using 16 500 events with a visible V0 decay in a 10 event/μb experiment in BEBC. No enhancements are observed in the invariant mass distributions of Ks0 + nπ (n = 1-5) and λ(λ) + nπ (n = 1-3) in the regions of the known charmed particle masses. The upper limits for the product of the inclusive production cross sections times decay branching ratios of D, D* and λc particles as well as the production of pairs of charmed mesons are calculated at 95% confidence level. The Ks0 yields per annihilation event in e+e- and pp interactions are compared at various energies.