Observation of a soft photon signal in excess of QED expectations in pp interactions

A Belogianni, John Kinson, Andrew Kirk, Orlando Villalobos Baillie

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Photons produced in pp interactions at 450 GeV/c were detected by reconstructing the e(+)e(-) pairs of photon conversions in a 1 mm thick lead sheet placed in front of the MWPCs of the OMEGA spectrometer at CERN. A soft photon signal 4.1 +/- 0. 8 times the inner bremsstrahlung prediction was observed in the forward rapidity region (y(c.m.s). greater than or equal to 1.2), thus extending the domain of the anomalous soft photon effect seen already in K(+)p, pi(+) p and pi(-) p interactions. (C) 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)129-139
Number of pages11
JournalPhysics Letters B
Volume548
Issue number3-4
DOIs
Publication statusPublished - 21 Nov 2002

Keywords

  • Bremsstrahlung
  • photon excess
  • soft photons
  • pp interactions

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