Tuning Herwig 7 with the Lund string model

14 Nov 2022, 12:30
WG1: Monte Carlo, MB, and UE WG1: Monte Carlo, MB, and UE


Pratixan Sarmah (Jagiellonian University)


Monte Carlo Event Generators contain several free parameters that cannot be inferred from first principles and need to be tuned to better model the data. With increasing precision of perturbative theoretical calculations to higher orders and hence decreasing theoretical uncertainties, it becomes crucial to study the systematics of non-perturbative phenomenological models. A recent attempt was made at tuning the combination of the angular-ordered parton shower (AOPS) in Herwig7 and Lund string hadronization model (AOPS+string) to LEP data with a new approach called Autotunes [1]. However, the resultant tune shows worse performance to important observables like LEP event shapes when compared to the previous tunes of the AOPS+cluster model. Since the AOPS and the string hadronization model perform well in other tunes of Herwig7 and Pythia8, we would naively expect them to perform better together and thus investigate further by tuning with the Professor approach adopted in [2]. We present the results of our tune and compare it with the Herwig7 default (AOPS+cluster model) and Autotunes tunes.

[1] High dimensional parameter tuning for event generators, J.Belm, L.Gellersen, Eur.Phys.J.C 80 (2020) 1, 54
[2] Systematic event generator tuning for the LHC, A.Buckley et al, Eur.Phys.J.C 65 (2010) 331-357

Primary authors

Andrzej Siodmok (Jagiellonian University) Pratixan Sarmah (Jagiellonian University) Miroslav Myska (CTU in Prague)

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