Tuning PYTHIA8

Under:

Organization

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Chair: Matthew Kelsey (mkelseyATwayne.edu)
Members: Raghav Kunnawalkam Elayavalli, Hanseul Oh, Yuanjing Ji, Jan Vanek, Qian Yang, Zilong Chang

Ex Officio: Jason Webb

Charge
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Study PYTHIA8 event generator to attempt to determine a tune that better matches available RHIC data. Produce a writeup documenting these studies, results, and a "STAR tune" set of parameters. An initial report is expected in 3-6 months, and the final document in 6-12 month

Mailing list
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A dedicated mailing list is created: star-tf-tunepy-l@lists.bnl.gov
Subscription page: 
https://lists.bnl.gov/mailman/listinfo/star-tf-tunepy-l 
 
Meetings (Wed. @ 3 PM BNL Time)
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11/06/2020:
Zilong Chang: STAR PYTHIA6 Tune 
drupal.star.bnl.gov/STAR/system/files/starpythia6.pdf
Raghav Elayavalli: Quick Look at PYTHIA 8 Tune
drupal.star.bnl.gov/STAR/system/files/pythia8_tune_quick_look_v0_0.pdf

12/2/2020:
Matt Kelsey:
RIVET task list and introductory pointer drupal.star.bnl.gov/STAR/system/files/Kelsey_Pythia8Tune_2Dec2020.pdf


1/6/2021:
Matt Kelsey:
STAR Analysis Meeting Report drupal.star.bnl.gov/STAR/system/files/Kelsey_Pythia8Tune_CollabMeeting_6Jan2021.pdf

1/20/2021:
Minutes:
drupal.star.bnl.gov/STAR/system/files/Minutes_1_20_21.pdf

2/24/2021:
Yuanjing Ji: Update on identified spectra RIVET analysis: 
https://drupal.star.bnl.gov/STAR/system/files/pythiatune0223.pdf
Matt Kelsey:
Update on Professor status and first pass at tuning https://drupal.star.bnl.gov/STAR/system/files/Kelsey_Pythia8Tune_24JFeb2021.pdf


3/10/2021:
Matt Kelsey:
STAR Collaboration Meeting Report drupal.star.bnl.gov/STAR/system/files/Kelsey_Pythia8Tune_CollabMeeting_10Mar2021.pdf

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Proposed tuning observables

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- Single particle spectra + proton/pion ratio (https://arxiv.org/pdf/0808.2041.pdf, https://www.hepdata.net/record/ins930463)
- Jet cross section (https://drupal.star.bnl.gov/STAR/blog/zchang/run12-pp510-jet-cross-seciton-preliminary-plot)
- Jet mass (paper in collab.-wide review)
- Jet sub-structure (https://arxiv.org/pdf/2003.02114.pdf)
- Underlying event (https://arxiv.org/pdf/1912.08187.pdf)

- Drell-Yan (https://arxiv.org/pdf/1805.02448.pdf Tables XII + XIII) RIVET: PHENIX_2019_I1672015
Heavy Flavor:
- Open Charm spectra (https://arxiv.org/pdf/1204.4244.pdf, https://arxiv.org/pdf/1404.6185.pdf)
- Heavy flavor decayed electron pt spectra (https://arxiv.org/pdf/1102.2611.pdf, https://arxiv.org/pdf/1102.2611.pdf)

Forward Physics:
- Charged particle rapidity dependence (https://arxiv.org/pdf/1011.1940.pdf)
- p/K/pi spectra at forward rapidities (https://arxiv.org/pdf/hep-ex/0701041.pdf)
- Identified hadron cross-section (https://arxiv.org/pdf/0908.4551.pdf)
- Proton/Pion ratio (https://arxiv.org/pdf/0910.3328.pdf)

- Drell-Yan (https://arxiv.org/pdf/1805.02448.pdf Tables XII + XIII) RIVET: PHENIX_2019_I1672015
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Git repository
Contact Matt for access.

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Useful links
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Professor: https://professor.hepforge.org/, main paper reference https://arxiv.org/pdf/0907.2973.pdf
Apprentice: https://iamholger.gitbook.io/apprentice/, new paper: https://arxiv.org/pdf/2103.05748.pdf
CMS HERWIG 7 tuning: https://arxiv.org/abs/2011.03422