STAR task force for tuning PYTHIA

[Raghav Kunnawalkam Elayavalli <kunnawalkamraghav AT gmail.com>]

Hi All,

just saw this paper on the arxiv from CMS where they tuned HERWIG 

Title: Development and validation of HERWIG 7 tunes from CMS underlying-event
 measurements
Authors: CMS Collaboration
Categories: hep-ex
Comments: Submitted to EPJC. All figures and tables can be found at
 http://cms-results.web.cern.ch/cms-results/public-results/publications/GEN-19-001
 (CMS Public Pages)
Report-no: CMS-GEN-19-001, CERN-EP-2020-182
\\
 This paper presents a new set of parameters ("tunes") for the
underlying-event model of the HERWIG 7 event generator. These parameters
control the description of multiple-parton interactions (MPI) and colour
reconnection in HERWIG 7, and are obtained from a fit to minimum-bias data
collected by the CMS experiment at $\sqrt{s}=$ 0.9, 7, and 13 TeV. The tunes
are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution
function (PDF) set for the parton shower, and either a leading-order or
next-to-next-to-leading-order PDF set for the simulation of MPI and the beam
remnants. Predictions utilizing the tunes are produced for event shape
observables in electron-positron collisions, and for minimum-bias, inclusive
jet, top quark pair, and Z and W boson events in proton-proton collisions, and
are compared with data. Each of the new tunes describes the data at a
reasonable level, and the tunes using a leading-order PDF for the simulation of
MPI provide the best description of the data.
\\ ( https://arxiv.org/abs/2011.03422 ,  2190kb)

See section 3 where the procedure is outlines - 

"The tuning is performed within thePROFESSOR(v1.4.0) framework [30]. Around 60 random choices of the parameters are made, and predictions for each of these choices are obtained using RIVET. Approximately 10 million MB events are generated for each choice of parameters, such that the uncertainty in the prediction in any bin is typically not larger than the uncertainty in the data in the same bin."

I will ask Christian as well later today when i get some time but it looks like this is the established path. 

Cheers

Raghav 

**************************************

Raghav Kunnawalkam Elayavalli

email: raghavke AT wayne.edu 

Post Doctoral Fellow 

Wayne State University

666 W Hancock St. RM 314 

Detroit MI. 48201

<he/him/his>

**************************************

On Nov 6, 2020, at 1:45 PM, Matthew Kelsey via Star-tf-tunepy-l <star-tf-tunepy-l AT lists.bnl.gov> wrote:

Hello all,

Please note I have added a zoom meeting password: startune

Talk to you shortly,

Matt

——————————
Matthew Kelsey 
Postdoctoral Scholar
Nuclear Science Division
Lawrence Berkeley National Lab
1 Cyclotron Road
Berkeley, CA 94720
<he-him-his>

On Nov 6, 2020, at 1:18 PM, Chang, Zilong <zchang AT bnl.gov> wrote:

Hi Matt and others,

You can find my slides for today at the link below. It contains two slides summarizing what we have done before in our working group.

https://drupal.star.bnl.gov/STAR/blog/zchang/pythia-tune-study

Thanks,
Zilong

On Nov 5, 2020, at 3:51 PM, Matthew Kelsey via Star-tf-tunepy-l <star-tf-tunepy-l AT lists.bnl.gov<mailto:star-tf-tunepy-l AT lists.bnl.gov>> wrote:

Hello all,

We will have our first task force meeting to discuss plans for the PYTHIA 8 tuning tomorrow at 2 PM BNL time. Please find the zoom meeting details below.

Zilong has agreed to give a short account of the experiences with the previous PYTHIA 6 STAR tune. Besides that let's use this time to discuss ideas and potential plans to move forward.

Cheers,
Matt

——————————
Matthew Kelsey
Postdoctoral Scholar
Nuclear Science Division
Lawrence Berkeley National Lab
1 Cyclotron Road
Berkeley, CA 94720
<he-him-his>

Topic: PYTHIA 8 Tune
Time: Nov 6, 2020 02:00 PM Eastern Time (US and Canada)

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