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Inclusive Prompt Photon Production in Hadronic Final States of $e^+e^-$ Annihilation

Edmond L. Berger·Xiaofeng Guo·Jianwei Qiu
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Abstract

We provide complete analytic expressions for the inclusive prompt photon production cross section in hadronic final states of $e^+e^-$ annihilation reactions through one-loop order in quantum chromodynamics perturbation theory. Computed explicitly are direct photon production through first order in the electromagnetic strength $α_{em}$ and the quark-to-photon and gluon-to-photon fragmentation contributions through first order in the strong coupling $α_s$. The full angular dependence of the cross sections is displayed, separated into transverse $(1 +\cos ^2θ_γ)$ and longitudinal $(\sin ^2θ_γ)$ components, where $θ_γ$ specifies the direction of the photon with respect to the $e^+e^-$ collision axis. We discuss extraction of fragmentation functions from $e^+e^-$ data.

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Edmond L. Berger, Xiaofeng Guo, Jianwei Qiu. 1995-07-29. Inclusive Prompt Photon Production in Hadronic Final States of $e^+e^-$ Annihilation. https://doi.org/10.1103/physrevd.53.1124

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