Phys. Rev. D 38, 2687–2694 (1988)Comparison of low-PT photon production in high- and low-multiplicity collisions at the CERN ISRReceived 30 June 1988; published in the issue dated 1 November 1988 Low-transverse-momentum photon production at the CERN ISR is compared in high- and low-multiplicity events. High-transverse-energy pp collisions and low-multiplicity αα and pp collisions are studied. Relative photon-to-charged-track production is found to be the same in pp minimum bias, αα minimum bias, and pp high-transverse-energy collisions, to within 15%. No low-PT excess is seen; the limits are dominated by systematic uncertainties. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.38.2687
DOI:
10.1103/PhysRevD.38.2687
PACS:
13.85.Qk, 25.55.-e
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