Tuning PYTHIA8

Organization

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

 Charge
=========================
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


Paper
=========================
Final for submission v6
Latest Paper draft during STAR review v5
Old -- v4, v3,v2
Paper draft (internal) v1 


Github with Settings and RCF Instructions
=========================
https://github.com/mjk655/DetroitTuneOnRCF


 Mailing list
=========================
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)
=========================
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

4/28/2021:
Zilong Chang: Comparisons of 510 GeV jet spectra with different PYTHIA versions+PDFs https://drupal.star.bnl.gov/STAR/system/files/Pythia8tune_pp510.pdf

4/28/2021:
Zilong Chang: Studies of using MB vs. partonic bins for tuning exercise: https://drupal.star.bnl.gov/STAR/system/files/Pythia8tune_200pip.pdf
Matthew Kelsey: Variations in tunes: https://drupal.star.bnl.gov/STAR/system/files/Kelsey_Pythia8Tune_19May2021.pdf

5/5/2021:
Zilong Chang: %10 GeV jet studies with tuned MPI and ISR variations: https://drupal.star.bnl.gov/STAR/system/files/Pythia8tune_pp510_isr.pdf

5/26/2021:
Manny Rosales: Studies of feed-down contributions to forward identified spectra: drupal.star.bnl.gov/STAR/system/files/BRAHMS_Invariant_CrossSection%28Pion-Kaon-Proton%29_2M_SFT_NONDIFFRACTIVE.pdf

6/2/2021:
Matt Kelsey: Various tune updates/Z0->ee RIVET/Points for outside discussions: drupal.star.bnl.gov/STAR/system/files/Kelsey_Pythia8Tune_2June2021.pdf

====================================================================================================

Tuning observables
=========Legend===========
Green = RIVET done and tested
Red    = RIVET needs work/testing
Black = No current RIVET/HepData available
=========================

Mid-rapidity:
 - Single particle spectra + proton/pion ratio (https://arxiv.org/pdf/0808.2041.pdf, https://www.hepdata.net/record/ins930463)
- 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
- Preliminary jet cross section @ 200 GeV

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)

p+p @ 510 GeV:
- Jet cross section (https://drupal.star.bnl.gov/STAR/blog/zchang/run12-pp510-jet-cross-seciton-preliminary-plot)
- Z pT spectrum (https://drupal.star.bnl.gov/STAR/files/Fazio_DNP_Fall_OCT2020_v6.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
- Jet energy @ 500 GeV (https://www.sciencedirect.com/science/article/pii/S0370269315007522?via%3Dihub)
- Forward pi0 cross section vs. leading pion energy (PhysRevLett.92.171801)
====================================================================================================
Working Git repository
Contact Matt for access.
====================================================================================================
Useful links
=========================
 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
CMS PYTHIA 8 UE Tune: https://arxiv.org/pdf/1903.12179.pdf
CMS PYTHIA 8 pT0Ref Energy Dependence: https://arxiv.org/pdf/1801.02536.pdf
LHCb PYTHIA 8 Tune Details: https://journals.aps.org/prl/supplemental/10.1103/PhysRevLett.123.232001/Supplemental.pdf
ATLAS PYTHIA 8 Tunes: https://inspirehep.net/literature/1197134
Forward PYTHIA 6 Studies: https://www.star.bnl.gov/~eca/INFO/Pythia-pi0-directGamma.pdf