22 research outputs found

    ATLAS detector and physics performance: Technical Design Report, 1

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    A study of the production of two direct photons in pp collisions at the CERN ISR

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    We have studied the process pp→γγ+X at {Mathematical expression} 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-section dσ/dydMγγ=(5.5±2.7)×10-34 cm2/GeV when |y|<0.5,4<Mγγ<6 GeV. © 1986 Springer-Verlag

    Direct-photon plus away-side jet production in pp collisions at Mathematical expression GeV and a determination of the gluon distribution

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    We have determined the double inclusive cross-section for opposite-side high-pT photons and away-side jets with θγ≈θjet≈90° produced in pp collisions at the CERN Intersecting Storage Rings at {Mathematical expression} GeV. Under the assumption that these events arise predominantly from the QCD gluon Compton process we have calculated the gluon structure function in the range 0.15≦x≦0.30 at an average square of the four-momentum transfer of 40 GeV2/c2. The data favour a soft gluon distribution in the proton. © 1987 Springer-Verlag
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