R. Poster

Evidence for the Goldhaber effect in pp interactions at 300 GeV/c☆

Abstract We have observed evidence for the Goldhaber effect among pion pairs produced in six- and eight-prong events in pp interactions at 300 GeV/ c . We observe a pronounced difference between the opening angle distributions for pairs of pions of like and unlike electric charge. This effect decreases rapidly with increasing all-charged pion mass. Calculations indicate that resonance production can account for only about 30% of the observed effect. A search for the Goldhaber effect in high-charged-multiplicity events ( n c ⩾ 20) gives only inconclusive results.

pp interactions at 303GeVc: Separation of diffractive and nondiffractive components of the multiplicity distribution

Abstract We have studied the properties of the inclusive pp → pX reation at 303 GeV c . Protons of momentum 1.4 GeV c or less are measured and identified by their ionization. We investigate the multiplicity distribution associated with those events having a small four-momentum transfer to the target proton. Under the assumption that this selection enhances or isolates the diffractive component of the interaction, we discuss the properties of the diffractive and nondiffractive components.

pp Interactions at 303 GeV/c: Production angle distribution

Abstract We have measured the projected production angles of all charged particles in more than 1600 pp interactions at 303 GeV/ c . We have obtained semi-inclusive distributions of pseudo-rapidity and dispersion of pseudo-rapidity event-by-event. The mean dispersion is found to be approximately constant for charged multiplicity, n ch , from 6 to 16.

Study of ϱ0 production in high multiplicity pp interactions at 300 GeV/c☆

Abstract We have searched for ϱ 0 production in 85 high multiplicity events with 18 or more charged particles. We observe an enhancement at the ϱ 0 mass but with a considerably narrower width. If we ignore this narrow width, we measure the cross section for pp → ϱ 0 + n charged particles with n ⩾ 16 to be 1.81 ± 0.46 mb. The ratio between the number of ϱ 0, s and π −, s is observed to increase from 0.08 ± 0.04 for p T c to 0.88 ± 0.23 for p T > 0.6 GeV/ c .

Negative results of a search for alignment in high energy collisions

Abstract Using proton-proton interactions at 205 and 300 GeV/ c we have searched for an alignment of the produced particles due to high angular momentum in the primary collision. The negative results of this search are discussed.

The production of ∑±'s in e+e− annihilations

We find an increase in ∑± production between Ecm = 4 and 7 GeV which is consistent with charmed baryon production models. A search for the decay ∧c−→∑±π±π− yields no significant peaks.

pp Interactions at 303 GeV/c: Inclusive Studies of γ, K°s, Λ°, π± and Proton Production

In an exposure of the 30 inch hydrogen bubble chamber to a 303 GeV/c proton beam, we have measured both V° events and all tracks with momentum less than 1.4 GeV/c. From these measurements the properties and cross sections of the inclusive pp ⇒ γX, K°sX and Λ°X reactions are studied. In addition, single particle invariant cross sections for pions and protons are presented and the scaling behavior of these reactions is discussed.