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Diffraction dissociation at the CERN pulsedpp collider at c.m. Energies of 900 and 200 GeV |
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| Authors: | R E Ansorge B ?sman C N Booth L Burow P Carlson R S De Wolf A Drees B Eckart G Ekspong I Evangelou C Fuglesang J Gaudean C Geich-Gimbel B Holl R Hospes K Jon-And D P Johnson F Lotse N Manthos D J Munday J E V Ovens W Pelzer J G Rushbrooke H Schmickler F Triantis L Van hamme C Walck C P Ward D R Ward C J S Webber T O White G Wilquet N Yamdagni UA Collaboration |
| Institution: | 1. Cavendish Laboratory, Department of Physics, University, CB3 OHE, Cambridge, UK 2. Institute of Physics, University, S-11346, Stockholm, Sweden 4. Physikalisches Institut der Universit?t, D-5300, Boon, Federal Republic of Germany 5. CERN, CH-1211, Geneva 23, Switzerland 7. Inter-University Institute for High Energies (ULB-VUB), B-1050, Brussels, Belgium |
| Abstract: | Cross-sections for diffractive particle production and pseudorapidity distributions of the decay products of diffractive states are presented. The data were obtained with the UA 5 streamer chamber detector at the CERNpp Collider operated in a new pulsed mode yieldingpp interactions at c.m. energies of 900 and 200 GeV. Data recorded with a special trigger designed to select a sample of events enriched in single-diffractive interactions clearly favour ap t -limited fragmentation of diffractive states. The cross-section for single-diffractive particle production ? was found to be 7.8±0.5±1.1 mb at 900 GeV and 4.8±0.5±0.8 mb at 200 GeV (first error statistical, second systematic). From the pseudorapidity distribution of diffractive states we deduce the average number of charged particles to be 6.5±1.0 at 900 GeV and 4.1±1.1 at 200 GeV. Furthermore we report on our estimates for the cross-section of double-diffractive particle production at both Collider energies. |
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