Direct Photon Plus Away - Side Jet Production in $p p$ Collisions at $s^1$/2 = 63-{GeV} and a Determination of the Gluon Distribution

We have determined the double inclusive cross-section for opposite-side high-pT photons and away-side jets withθγ≈θjet≈90° produced inpp collisions at the CERN Intersecting Storage Rings at

\sqrt s= 63

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.

P P: COLLIDING BEAMS
COLLIDING BEAMS: P P
P P: INCLUSIVE REACTION
PHOTON: HADROPRODUCTION
HADROPRODUCTION: PHOTON
PHOTON: DIRECT PRODUCTION
DIRECT PRODUCTION: PHOTON
JET: ASSOCIATED PRODUCTION
ASSOCIATED PRODUCTION: JET
TRANSVERSE MOMENTUM: HIGH

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