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A Study of the Production of Two Direct Photons in $p p$ Collisions at the {CERN} {ISR}

The Axial Field Spectrometer collaboration Åkesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Z.Phys.C 32 (1986) 491-497, 1986.

Inspire Record 228954 DOI 10.17182/hepdata.15834

We have studied the processpp→γγ+X at$\sqrt s= 63 GeV$ GeV in the central rapidity region. We report a positive signal at 96% C.L., a ratio γγ/e+e−=4.0±3.0 when the transverse momentum of each photon is above 2 GeV/c, and a cross-sectiondσ/dydMγγ=(5.5±2.7)×10−34 cm2/GeV when |y|<0.5,4<Mγγ<6 GeV.

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A Study of the Production of Two Direct Photons in $p p$ Collisions at the {CERN} {ISR}