Parton-shower uncertainties with Herwig 7: benchmarks at leading order

The European Physical Journal C

Johannes Bellm¹  Peter Schichtel¹  Simon Plätzer²  Graeme Nail³  Andrzej Siódmok⁴ 

[1] Department of Physics, IPPP, Durham University, Durham, UK;Department of Physics, IPPP, Durham University, Durham, UK;Particle Physics Group, School of Physics and Astronomy, University of Manchester, Manchester, UK;Particle Physics Group, School of Physics and Astronomy, University of Manchester, Manchester, UK;Institute for Theoretical Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany;TH Department, CERN, Geneva, Switzerland;The Henryk Niewodniczanski Institute of Nuclear Physics in Cracow, Polish Academy of Sciences, Kraków, Poland;

关键词: Transverse Momentum;    Parton Shower;    Hard Process;    Hard Scale;    Parton Distribution Function;   

DOI  :  10.1140/epjc/s10052-016-4506-x

来源: Springer

【 摘 要 】

We perform a detailed study of the sources of perturbative uncertainty in parton-shower predictions within the Herwig 7 event generator. We benchmark two rather different parton-shower algorithms, based on angular-ordered and dipole-type evolution, against each other. We deliberately choose leading order plus parton shower as the benchmark setting to identify a controllable set of uncertainties. This will enable us to reliably assess improvements by higher-order contributions in a follow-up work.

【 授权许可】

CC BY