We have measured the total inelastic cross section (o-jnel) a^d charged-particle multiplicities obtained mpp collisions at 405 GeV/c. The data are from a preliminary 12 000picture bubble-chamber exposure. We find cri^ei^ 32.8±1.0 mb; the low moments of the multiplicity distribution for negative particles are (??-)-3.50±0.07, D^ =2.37±0.05, f{ = 2.1±0.2, and/g" =0.1±0.9. We also present updated results at 102 GeV/c.
2 3~o r relativistic particles the distribution of L. Landau [J. Phys. 3, 201 (1944)1, a s tabulated by W. Borsch-Supan [J. Res. Natl. Bur. Stand. =, 245 (1961)1, is used. For other particles the distribution of P. V. Vavilov, Zh. Eksp. Teor. Fiz. 32, 920 (1957) [Sov. Phys.-JETP 5, 749 (1957)1, is used. 2 4~. Porat and D. Ouimette, SLAC Technical Note No. SLAC-TN-71-13 (unpublished).We present preliminary results on single-pion production and two-pion correlations making use of a 30 000-picture exposure of the ANL/NAL 30-in. hydrogen bubble chamber to 102-GeV/c protons. The data, when compared with those from lower energies, indicate approximate scaling of a-production in the proton-fragmentation region, but show a continuing rise of the cross section at y,,, = 0. Stronger correlations are observed between pions of opposite charge than between pions of like charge. The variation with energy of the charge transferred between c.m. hemispheres is slow, as would be predicted by multiperipheral-type models.
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