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Antiproton-proton cross sections at 200 and 900 GeV c.m. energy |
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| Authors: | G J Alner R E Ansorge B ?sman C N Booth L Burow P Carlson C DeClercq R S DeWolf A Drees B Eckart G Ekspong I Evangelou A Eyring J -P Fabre L Fr?bel C Fuglesang J Gaudaen C Geich-Gimbel B Holl G von Holtey R Hospes K Jon-And Th Kokott F Lotse N Manthos R Meinke D J Munday J E V Ovens W Pelzer J J Reidy J G Rushbrooke H Schmickler F Triantis L Van hamme Ch 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 of Cambridge, CB3 OHE, UK 2. Institute of Physics, University, S-11346, Stockholm, Sweden 3. Physikalisches Institut der Universit?t, D-5300, Bonn, Federal Republic of Germany 4. Inter-University Institute for High Energies (ULB-VUB), B-1050, Brussels, Belgium 5. CERN, CH-1211, Geneva 23, Switzerland |
| Abstract: | Data on antiproton-proton cross sections at the c.m. energies 200 and 900 GeV are presented. The data were obtained at the CERN antiproton-proton Collider operated in a new pulsed mode in which the same beams were accelerated and decelerated between beam energies of 450 and 100 GeV. The properties of the machine determine the ratio of the luminosities at the two energies to about 1% and thus an accurate measurement of the ratioR of the inelastic cross sections could be made. We findR (=σ 900/σ 200)=1.20±0.01±0.02, where the first error is statistical and the second systematic. Interpolating existing data to estimateσ ine1(200 GeV) this measurement ofR leads toσ ine1(900 GeV)=50.3+0.4+1.0 mb. Using an extrapolated value ofσ e1/σ tot we estimate the total cross section at 900 GeV to be 65.3±0.7±1.5 mb. Both the inelastic and total cross sections are compatible with a ln2 s dependence. Comparisons are made with different fits to the total cross section energy dependence. |
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