Tuning PYTHIA 8.1: the Monash 2013 tune

By Peter Z. Skands, Stefano Carrazza, Juan Rojo. 2014

1,312 citations recorded by the source corpus.

We present an updated set of parameters for the PYTHIA 8 event generator. We reevaluate the constraints imposed by LEP and SLD on hadronization, in particular with regard to heavy-quark fragmentation and strangeness production. For hadron collisions, we combine the updated fragmentation parameters with the new NNPDF2.3 LO PDF set. We use minimum-bias, Drell–Yan, and underlying-event data from the LHC to constrain the initial-state-radiation and multi-parton-interaction parameters, combined with data from SPS and the Tevatron to constrain the energy scaling. Several distributions show significant improvements with respect to the current defaults, for both $$ee$$ee and $$pp$$pp collisions, though we emphasize that interesting discrepancies remain in particular for strange particles and baryons. The updated parameters are available as an option starting from PYTHIA 8.185, by setting Tune:ee = 7 and Tune:pp = 14.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a4eda63e51bdce069f5d2142b0719e902ca174bd

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In Artificial Intelligence

1. Cms Collaboration
2. A. Larkoski
3. G. Soyez
4. Atlas Collaboration
5. Joeri Hermans
6. Gilles Louppe
7. Volodimir Begy
8. S. Marzani

In Nuclear and High Energy Physics

1. Cms Collaboration
2. Atlas Collaboration
3. A. Larkoski
4. Jesse Thaler
5. G. Soyez
6. S. Marzani
7. Peter Z. Skands
8. Alice Collaboration

Citations in the corpus

• Detecting and studying high-energy collider neutrinos with FASER at the LHC (2019, methodology): “3c (S) [61–64], and Pythia 8 (P) [66, 67], using both the Monash-tune [68] and the minimum bias A2-tune [69].”
• String formation beyond leading colour (2015, methodology): “It may point to a revision needed of the spectrum of hard (leading?) baryon production in jets, which may not be unique to the pp environment, see [34].”
• The Forward Physics Facility: Sites, experiments, and physics potential (2021, background): “An example is the Pythia Monash tune [327], where more than 50 parameters are explored.”
• Likelihood-free MCMC with Approximate Likelihood Ratios (2019, methodology): “We consider the P YTHIA simulator [21] configured according to the parameters derived by the Monash tune [22, 23].”
• Measurement of the Inelastic Proton-Proton Cross Section at root s=13 TeV with the ATLAS Detector at the LHC (2016, methodology): “The primary MC samples are based on the P ythia 8 generator [22, 23] either with the A2 [24] set of tuned underlying-event parameters and the MSTW 2008 LO PDF set [25] or with the Monash [26] set of tuned parameters and the NNPDF 2.3 LO PDF set [27].”
• Transverse momentum spectra and nuclear modification factors of charged particles in pp, p-Pb and Pb-Pb collisions at the LHC (2018, methodology): “For INEL pp collisions, the εVZ was estimated using the PYTHIA 8 (Monash 2013 tune) event generator [31, 32] and GEANT3 [33] detector response model.”