Hard photon production and matrix-element parton-shower merging
Stefan Hoeche, Steffen Schumann, Frank Siegert
TL;DR
This paper introduces an improved Monte-Carlo method for prompt-photon production that combines matrix-element calculations with parton showers, validated against experimental data from LEP and Tevatron.
Contribution
It extends existing merging algorithms to include higher-order real-emission matrix elements in a QCD+QED parton shower framework for photon production.
Findings
Good agreement with LEP photon fragmentation data
Accurate predictions for prompt photon production at Tevatron
Enhanced modeling of photon and diphoton processes
Abstract
We present a Monte-Carlo approach to prompt-photon production, where photons and QCD partons are treated democratically. The photon fragmentation function is modelled by an interleaved QCD+QED parton shower. This known technique is improved by including higher-order real-emission matrix elements. To this end, we extend a recently proposed algorithm for merging matrix elements and truncated parton showers. We exemplify the quality of the Monte-Carlo predictions by comparing them to measurements of the photon fragmentation function at LEP and to measurements of prompt photon and diphoton production from the Tevatron experiments.
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