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Updated: Dec 29, 2025

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
A case study of quark-gluon discrimination at NNLL in comparison to parton showers
Jonathan Mo1,2, Frank J Tackmann3, Wouter J Waalewijn1,2
11Institute for Theoretical Physics Amsterdam and Delta Institute for Theoretical Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
Abstract:
Predictions for our ability to distinguish quark and gluon jets vary by more than a factor of two between different parton showers. We study this problem using analytic resummed predictions for the thrust event shape up to NNLL using and as proxies for quark and gluon jets. We account for hadronization effects through a nonperturbative shape function, and include an estimate of both perturbative and hadronization uncertainties. In contrast to previous studies, we find reasonable agreement between our results and predictions from both Pythia and Herwig parton showers. We find that this is due to a noticeable improvement in the description of gluon jets in the newest Herwig 7.1 compared to previous versions.
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