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Double prompt photon production at high transverse momentum byπ − on protons at 280 GeV/c |
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| Authors: | E. Bonvin R. Bopp L. J. Carroll A. J. Cass S. U. Chung M. Donnat P. A. Dorsaz M. E. Feliks L. Fluri J. N. Jackson M. N. Kienzle-Focacci J. G. Lynch M. Martin L. Mathys P. J. Negus L. Perini R. Poultney W. H. Range L. Rosselet S. W. Snow A. S. Thompson R. M. Turnbull M. Werlen WA -Collaboration |
| Affiliation: | 1. University of Neuchatel, CH-2000, Neuchatel, Switzerland 2. D.P.N.C., University of Geneva, CH-1211, Geneva, Switzerland 3. Department of Physics, University of Liverpool, L69 3BX, Liverpool, UK 4. Department of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK 5. CERN, CH-1211, Geneva 23, Switzerland |
| Abstract: | A search for pairs of highp T prompt photons produced in hydrogen by a 280 GeV/c incidentπ - beam has been carried out using a fine-grained electromagnetic calorimeter and the Omega spectrometer at the CERN SPS. Clear evidence for the existence of such events is found with a six standard deviation signal forp T >3.0 GeV/c. The cross-sections are consistent with beyond leading order QCD calculations. A discussion on the determination of α s is also presented. |
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