Direct photons in e+e- annihilation

E. Laermann, T. F. Walsh, I. Schmitt, P. M. Zerwas

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37 Scopus citations

Abstract

We study the production of direct photons in e+e- annihilation e+e- → γ + hadrons, where the high-energy photon is emitted at a large angle to a hadron jet or is a fragment of the jet itself. We give the angle and energy dependence of the cross section for photons radiated from the final-state quarks, the initial-state leptons, and also the interference term. Large angle radiation by the quarks is only mildly affected by QCD corrections to the parton model. For photons radiated within or near a jet axis, however, the gluon radiative corrections can be large. We study the phenomenological implications of these corrections at present and future energies. Direct photon production affords a unique view into the short- and long-distance processes of jet formation. It can help clarify the space-time transition between perturbative and non-perturbative processes in jet development.

Original languageEnglish (US)
Pages (from-to)205-232
Number of pages28
JournalNuclear Physics, Section B
Volume207
Issue number2
DOIs
StatePublished - Nov 8 1982

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