sPHENIX discussion of software

["Huang, Jin" <jhuang AT bnl.gov>]

Hi, Kolja

 

Thank you for the excellent work! It is exciting to see more collaborators masters constructing jets in sPHENIX.

 

Meanwhile, I would like to bring your attention to the jet reco modules that is being developed as the reference algorithm for sPHENIX:

·       https://github.com/sPHENIX-Collaboration/macros/blob/master/macros/g4simulations/G4_Jets.C

·       https://www.phenix.bnl.gov/WWW/offline/doxygen_sPHENIX/html/d7/df3/classJetReco.html

Mike McCumber might comment more on this, as he has been working very hard constructing these modules and making rapid progresses. Mike has implemented most of the functionalities. As I understand, he is working on incorporating more features (e.g. vertex position correction for towers/cluster’s eta) and verifications. For now, this module is disabled by default in Fun4All_G4_sPHENIX.C. Nevertheless, we can enable it privately and run tests.  

 

Therefore, I think your analysis module would be a nice crosscheck for Mike’s work. It would be great if we could help Mike verify JetReco, both by comparing the result and by checking into the implementation of JetReco.

 

Meanwhile, I noticed you also have a few code implementing particle flow jet in PJTranslator::process_event(), although it is commented out right now. You might also want to check out Javier Orjuela-Koop’s study when he investigated last time:

·       His study was in the Apr 17 CDS agenda, which is behind the PHENIX firewall. Therefore I have included it in the attachment of this email.  

·       https://github.com/sPHENIX-Collaboration/analysis/tree/master/PHFlowJetMaker

I am still curious whether we can reproduce CMS’ flow jet results, when we arbitrarily crank up the sPHENIX B*L^2 to the CMS level.

 

Last, when you have some progress plots, please consider a talk in the weekly simulation meetings, Tue 1PM EST:

·       https://indico.bnl.gov/categoryDisplay.py?categId=88

Looking forward to hearing from you.

 

Cheers,

 

Jin

 

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

> -----Original Message-----

> From: sphenix-software-l-bounces AT lists.bnl.gov [mailto:sphenix-software-l-

> bounces AT lists.bnl.gov] On Behalf Of Kolja Kauder

> Sent: Monday, August 17, 2015 4:53 PM

> To: sphenix-software-l AT lists.bnl.gov

> Subject: [Sphenix-software-l] AJ analysis

>

> Hi all,

>

> I just realized I never uploaded this. I added a simplified version of my AJ

> analysis to github.

> https://github.com/sPHENIX-Collaboration/analysis/tree/master/sPhenixAj

>

> Running from Wrapper.cxx, it first translates detector output into PseudoJets

> for fastjet, then runs the analysis.

> The translator is where most of the corrections should happen. It currently

> does something very wrong (it accepts all tracks, EMC and HCal towers), but

> adding things like quality cuts and hadronic correction would be easy and this

> module is the logical spot. I could also transform the output into a jet

> container class.

>

> I ran it on a small pythia data set, so with only 15 dijets, plots are quite

> pointless, but the main point is it works just fine.

>

> Let me know if you have questions or suggestions for improvement.

>

> Cheers,

> Kolja

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> Sphenix-software-l AT lists.bnl.gov

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