Soft photon production in 450 GeV/c p-Be collisions

J. Antos, H. Beker, S. Brons, K. Bussmann, S. Dagan, A. Drees, C. Erd, M. J. Esten, C. W. Fabjan, P. Glässel, U. Goerlach, V. Hedberg, D. Lissauer, M. A. Mazzoni, N. A. McCubbin, M. Neubert, P. Nevski, L. Olsen, A. Pfeiffer, A. RayJ. Schukraft, D. Shapira, J. Soltani, H. J. Specht, I. Stumer, J. Thompson, R. J. Veenhof, W. J. Willis, C. Woody

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We have measured the inclusive pT spectra of soft photons produced at central and backward rapidities in 450 GeV/c p-Be collisions down to 1 MeV/c in transverse momentum. In the region 1<pT<20 MeV/c an excess of photons over those expected from hadronic decays is observed. This excess is comparable, within systematic errors, with estimates of direct photons produced via hadronic bremsstrahlung. An upper limit is derived on the presence of additional sources of direct photons at small transverse momentum.

Original languageEnglish
Pages (from-to)547-553
Number of pages7
JournalEuropean Physical Journal C
Issue number4
StatePublished - 1 Dec 1993
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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