High-pTproduction of direct photons and jets in quantum chromodynamics

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Abstract

The production of high-${p}_{T}$ direct photons is studied using quantum chromodynamics. The theoretical predictions are shown to be compatible with the existing data over the energy interval $20<\sqrt{s}<63$ GeV. In addition, the possibility of using a high-${p}_{T}$ direct-photon trigger in hadronic-jet experiments is studied. By simultaneously triggering on a direct photon and on the away-side hadronic jet it is possible to obtain more precise information concerning the underlying dynamical subprocesses than if a two-jet trigger is used. In particular, one can, by using a combination of ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, $p$, and $\overline{p}$ beams, measure both the pion quark and gluon distribution functions as well as the gluon distribution function for the proton. Furthermore, if particle identification is available for the away-side jet, one can separately measure various quark and gluon fragmentation functions. A method of measuring the ${Q}^{2}$ dependences of these various functions is also discussed.

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