Search for direct single-photon production at large pT in photon-proton collisions at √s = 62.4 GeV

A. L.S. Angelis, H. J. Besch, B. J. Blumenfeld, L. Camilleri, T. J. Chapin, R. L. Cool, C. Del Papa, L. Di Lella, Z. Dimčovski, R. J. Hollebeek, L. M. Lederman, D. A. Levinthal, J. T. Linnemann, C. B. Newman, N. Phinney, B. G. Pope, S. H. Pordes, A. F. Rothenberg, R. W. Rusack, A. M. SegarJ. Singh-Sidhu, A. M. Smith, M. J. Tannenbaum, R. A. Vidal, J. S. Wallace-Hadrill, J. M. Yelton, K. K. Young, CERN-Columbia-Oxford-Rockefeller (CCOR) Collaboration

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68 Scopus citations


As part of a study of large pT phenomena in photon-proton collisions at the CERN ISR, a search for direct single photon production has been performed. A statistical division of the data sample into the fraction consistent with single photon and the fraction due to multiphoton decays of neutral hadrons is accomplished by measuring the average conversion probability for the sample in a one radiation length thick converter. The fraction of the sample attributable to direct single photon production is 〈γ/all〉 = 0.074 ± 0.012 for 6 GeV/c < pT 10 GeV/c, and 〈γ/all〉 = 0.26 ± 0.04 for pT 〉 10 GeV/c, with an additional systematic uncertainty of ±0.05 for both values.

Original languageEnglish (US)
Pages (from-to)106-112
Number of pages7
Journal"Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics"
Issue number1
StatePublished - 1980

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