@article{3045694,
    title = "OBSERVATION OF DIRECT SOFT PHOTON PRODUCTION IN PI-P INTERACTIONS AT 280
GEV/C",
    author = "BANERJEE, S and BARBERIS, D and BELOGIANNI, A and BEUSCH, W and and BRODBECK, TJ and FRENCH, BR and GOLDSCHMIDTCLERMONT, Y and GRABOWSKI, M and and KERRES, U and KNUDSON, K and MORRIS, JAG and PEREPELITSA, V and and QUERCIGH, E and SONDEREGGER, P and SPYROPOULOUSTASSINAKI, M and and SUBRAMANIAN, A and VASSILIADIS, G and VICHOU, I and WEIGEND, A and and WILSON, GW",
    journal = "PHYSICS LETTERS B",
    year = "1993",
    volume = "305",
    number = "1-2",
    pages = "182-186",
    publisher = "ELSEVIER SCIENCE BV",
    issn = "0370-2693",
    doi = "10.1016/0370-2693(93)91126-8",
    abstract = "The OMEGA spectrometer, equipped with a hydrogen target and two
electromagnetic calorimeters, was used to investigate the production of
soft gammas in hadronic collisions. The E(gamma) and P(T) distributions
of the measured gamma’s are compared with the corresponding
distributions of gamma’s arising from hadronic decays and of gamma’s
expected from QED inner bremsstrahlung. An excess of gammas by a factor
of 7.9 +/- 1.4 over the QED prediction is measured in the low energy
(0.2 < E(gamma) < 1.0 GeV) and low P(T) (< 10 MeV/c) kinematic region,
and confirms the original observation of a similar effect in a bubble
chamber experiment."
}