Bose-Einstein correlations in pp collisions at 400 GeV/c

Bose-Einstein correlations among identically charged pions produced inpp collisions at 400 GeV/c are studied using the EHS spectrometer. Empoying the Kopylov-Podgoretskii parametrization, the average size of the emitting region rk and its lifetime τ for pion production were determined to be rk=1.71 ± 0.04 fm and c τ=0.89± 0.05fm. The average sizer g in terms of the Lorentz invariant Goldhaber parametrization was determined to be rg=1.20±0.03fm. A decrease of the size with increasing momentum of the pions was observed. The size and the incoherence parameter of the pion emitting region were determined as a function of the charged particle multiplicity and the momentum of the pions. Identified charged kaons were used to study Bose-Einstein correlations among identically charged kaons K± K± . The average size of the emitting region for kaon production was determined to be rk=1.87± 0.33fm in terms of the Kopylov-Podgoretskii parametrization. A study of the influence of a reference sample is presented

Inclusive particle production in 400 GeV/c pp-interactions

We report on a study of inclusive particle production in pp-interactions at 400 GeV/c. The data are based on 472 K reconstructed events recorded in the NA 27 experiment using the LEBC-EHS facility at CERN. The production cross sections are determined of pseudo scalar (π± ,0,η and K±), scalar (f 0(975)), vector (ρ± ,0(770),ω (783), Φ (1020),K∗ 0(892), and K∗ 0 (892)), and tensor f0 mesons, of protons and antiprotons, and the Δ++,+,0(1232), and Λ(1520) baryon resonances in the forward hemisphere of the center of mass system, as well as longitudinal and transverse momentum distributions. The results are compared with predictions of the FRITIOF model and with other experimental data

Inclusive production of ρ0\rho^{0} and f2f_{2} mesons in π−p\pi^{-}p interactions at 360 GeV/c

We report on a study of \u3c10 and f2 inclusive production in \u3c0 12 p interactions at 360 GeV/c, using the LEBC-EHS set-up at CERN and reconstructing about 165000 events. Thergr \u3c10, 2 and \u3c1_3^0 cross sections are determined for x_ F >0 ,x_ F >0.4 and x _F >0.6 respectively and the \u3c10 and f 2 Feynman-x distributions and transverse momentum distributions are presented

Vector meson production in π−\pi^{-}p interactions at 360 GeV/c

The inclusive production of vector mesons (charged rho(770), omega(783), phi(1020) and neutralK *(892)) in pi– p interactions at 360 GeV/c is studied. The data are based on 160 000 reconstructed events recorded in the NA 27 Experiment using the LEBC-EHS facility at CERN. The production cross sections in the forward hemisphere in c.m.s. and the longitudinal momentum distributions are determined. The results are compared with data obtained at lower energies