Measurements of pp-+n + n m +X at Vs = 44 and 62 GeV are compared. The data are taken under identical conditions utilizing clean proton-proton collisions from the CERN intersecting storage rings and confirm scaling to 5%. The observed JU + JT yield is a factor of 1.6 ± 0.2 larger than estimated from a simple parton model but is consistent with QCD. The p T dependence of the muon pairs agrees well with expectations from QCD.

The reaction pp → pX was studied at a centre-of-mass energy s = 540 GeV by measuring the momentum spectrum of the antiproton. Data are presented in the four-momentum transfer range 05 < −t < 1.2GeV2. The shape of the mass distribution of the system X shows a diffractive component as already observed at lower energies. The differential cross section scales approximately with energy when compared to the ISR data

We report the results of a study of the mechanism of inclusive dimuon production from the reaction p+p p p, +X at the CEHN intersecting storage rings. The present experiment was done at the center-of-mass energies vs =62 and 44 GeV and in the dimuon pair invariant- mass region m =3—25 GeV. The dependence on the Feynman variable x has been measured. The average transverse momentum is found to increase with Vs and with mass and reaches (Pr)~ 1.9 GeV, compatible with predictions from quantum-chromodynamic gluon processes

No abstract

Proton-antiproton elastic scattering was measured at a centre of mass energy s = 540 GeV. In the four-momentum transfer range 0.21 < −t < 0.50 GeV2 the t-distribution of about 7000 events is well represented by the exponential shape exp (bt) with slope parameter b = 13.7 ± 0.3 GeV−2. A new measurement of the slope for −t < 0.19 GeV2 confirms our earlier result, giving evidence for a change of slope of about 4 GeV−2 around −l̷ ≈ 0.15 GeV2