Search for direct gamma production at low transverse momentum in 63-GeV pp collisions

T. Akesson, M. G. Albrow, S. Almehed, E. Anassontzis, R. Batley, O. Benary, H. Boggild, O. Botner, H. Breuker, V. Burkert, B. Callen, R. Carosi, A. A. Carter, J. R. Carter, V. Chernyatin, Y. Choi, W. E. Cleland, S. Dagan, E. Dahl-Jensen, I. Dahl-JensenG. Damgaard, B. Dolgoshein, S. Eidelman, C. W. Fabjan, I. Gavrilenko, G. U. Goerlach, C. Y. Goloubkov, K. H. Hansen, V. Hedberg, P. Ioannou, G. Jarlskog, T. Jensen, A. Kalinovsky, V. Kantserov, S. Katsanevas, C. Kourkoumelis, R. Kroeger, K. Kulka, D. Lissauer, B. Lörstad, I. Manelli, A. Markou, S. Mayburov, N. A. McCubbin, R. Moller, W. Molzon, P. Nevsky, B. S. Nielsen, L. H. Olsen, Y. Oren, L. K. Resvanis, J. Schukraft, A. Shmeleva, V. Sidorov, H. Specht, I. Stumer, M. Sullivan, H. H. Thodberg, J. A. Thompson, J. Williamson, J. Willisc

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Abstract

We have searched for direct photons of low PT (1.0 GeV/c) at c.m.=90° in pp collisions at s =63 GeV. We used two independent methods: direct detection in NaI crystals and conversion to e+e- pairs. No signal is observed; the photon spectrum is well described by the decay of hadrons. The result is consistent with a direct low-PT photon signal reported at s =12 GeV, but excludes a rapid growth of soft-photon production with s.

Original languageEnglish
Pages (from-to)2615-2623
Number of pages9
JournalPhysical review D
Volume36
Issue number9
DOIs
StatePublished - 1987

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