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Re: [Sphenix-physics-l] [Sphenix-upsilons-l] [minutes] Joint HF/Quarkonium TG meeting Aug 24 at 9:30AM ET

Chronological Thread  
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  • From: Joe Osborn <osbornjd91 AT gmail.com>
  • To: "Huang, Jin" <jhuang AT bnl.gov>
  • Cc: "sphenix-physics-l AT lists.bnl.gov" <sphenix-physics-l AT lists.bnl.gov>, malong <malong AT fudan.edu.cn>, Weihu Ma <maweihu AT fudan.edu.cn>, Anders Knospe <ank220 AT lehigh.edu>, Daniel Lis <Daniel.Lis AT colorado.edu>, "sphenix-hf-Jets-l AT lists.bnl.gov" <sphenix-hf-jets-l AT lists.bnl.gov>, "Sphenix-upsilons-l AT lists.bnl.gov" <Sphenix-upsilons-l AT lists.bnl.gov>
  • Subject: Re: [Sphenix-physics-l] [Sphenix-upsilons-l] [minutes] Joint HF/Quarkonium TG meeting Aug 24 at 9:30AM ET
  • Date: Wed, 24 Aug 2022 15:45:15 -0400
Here is an example of how to use the Acts based Gaussian Sum Filter. The code is available on github:

https://github.com/sPHENIX-Collaboration/coresoftware/blob/master/offline/packages/trackreco/PHActsGSF.cc

And can be used by just adding it to your macro like:

PHActsGSF *gsf = new PHActsGSF();
se->registerSubsystem(gsf);

As a reminder, the Acts developers are still working through some bugs so this is not functional right now. We are hoping they will push some fixes soon so that we can update and start beta testing this new feature from the Acts tracking package. Nonetheless, it could be a good opportunity now to get familiarized with the above module and how it works as this will likely be run at the analysis level and not at the production level.

Joe Osborn

On Wed, Aug 24, 2022 at 3:24 PM Huang, Jin via sPHENIX-upsilons-l <sphenix-upsilons-l AT lists.bnl.gov> wrote:

Announcement:

 

Brainstorm on calibration needs for first HF/Q measurements 

 

Tony: What level of calibration do we need for each measurement? Some calibrations may take longer than others.  

Joe/Tony: to study the calibration dependency, we can implement fast smearing to mimic effects. A more precise description for the tracker is de-alignment

Jin: simulating de-alignment will be useful for HF, e.g. D0 inv mass for background rejection, which focuses on the resolution for the low pT tracking 

Dennis: Will that be implemented as stochastic shifts? or introducing rotation/shifts errors 

Tony: second case. Distortion is something else for TPC, to be discussed see Ross talk on Friday

 

Jin: from the HF measurements [ https://docs.google.com/presentation/d/e/2PACX-1vQIH_aR5BpeU8TuuLCpOaHXJVjb_QqDmJgN07sA9SHclc2l9js--OsFPh_-cbZZ7VwldHWsJzxkbGQ6/pub?start=false&loop=false&delayms=3000 ], exclusive decay rely less on perfect TPC distortion correction, but we will need good MVTX alignment for background rejection and lineshape for b-c separation. For HF jet, we also need good knowledge for tracking efficiency for efficiency-purity calculation. 

 

 

Tracking in jets: Dan Lis

 

Dan: observed weird low efficiency in phi and eta dependency

Ming: pT>0.8 GeV/c, good to have broad pT regions. 

Anders: pi periodicity in the phi distribution is suspicious

Tony: part of the problem may be from vertex reco&association requirements. 

Joe: high stat. and good to try multi-dimensional binning

Tony: would the requirement on three MVTX hits and the 10-cm vertex lead to some acceptance bias? 

 

Jin: Dip in eta=0 is very curious and not seen in standard jet and few particle QAs:

https://nbviewer.org/github/sPHENIX-Collaboration/QA-gallery/blob/jenkins-sPHENIX-test-tracking-pythiajet-qa-735-test-tracking_Event600_Sum10/QA-tracking.ipynb 

Jin: and good to check the eta and phi distribution in a few pT regions. 

 

 

Electron id update: Weihu Ma

 

Dennis: why negatively charged particles are weaker? 

Weihu/Marzia: pi-:k-:anti-proton ratio is 1:1:1

Jin: difference can come from the initial hadronic interaction and anti-proton is very difficult to reject. 

Conclusion: please separate hadron species (Weihu has the plot)

 

Jin: need more stat. and it is also plausible to do so on SDCC for single particle simulations. 

 

Dennis: please train vs pT to avoid kinematics bias in BDT

 

Weihu: embedding into 0-20fm collisions. 

Jin: will be useful for separated centrality 

 

Sasha: having about 1k Upsilon to HIJING embedding

 

Jin: good to have in the form of an sPHENIX analysis note so can be shown externally. 

 

 

D-D correlation: Xiaozhou Yu

 

Jin: Good to revive the fast sim machinery as moving to a new channel. 

 

Tony: what is the difference between DCA1 and 2?

 

Jin: follow up to obtain the newest performance from recent productions including pile-ups. 

 

 

Quarkonium simulations: Anders Knospe

 

Anders/Sasha: these are upsilons embedded to MB AuAu.

 

Jin: Does \delta R has a large dependency on pT? 

Andres: to be looked at.

 

Joe: What cuts were placed on the track? 

Anders: minimal cuts. Plan to apply more realistic cuts

 

Jin: please use rapidity instead of pseudorapidity for Upsilon as rapidity is more closely related to calculations and decay-daughter acceptance. 

 

Joe/Tony: we have a Gaussian Sum Filter (GSF) for electron analysis! Will follow up with examples of using it

 

 

(verbal) EvtGen decayer: Zhaozhong

 

Validated with particle gun. Pull request ongoing with coding issues. The calibration repo is to be updated with a newer version of the decay table. 

 

 

 

______________________________

 

Jin HUANG

 

Physicist, Ph.D.

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: sPHENIX-physics-l <sphenix-physics-l-bounces AT lists.bnl.gov> On Behalf Of Huang, Jin
Sent: Tuesday, August 23, 2022 12:14 PM
To: Sphenix-upsilons-l AT lists.bnl.gov; sphenix-hf-Jets-l AT lists.bnl.gov
Cc: sphenix-physics-l AT lists.bnl.gov; malong <malong AT fudan.edu.cn>; Weihu Ma <maweihu AT fudan.edu.cn>; Anders Knospe <ank220 AT lehigh.edu>; Daniel Lis <Daniel.Lis AT colorado.edu>
Subject: [Sphenix-physics-l] [reminder] Joint HF/Quarkonium TG meeting Aug 24 at 9:30AM ET

 

Dear sPHHENIX friends,

 

Our joint HF/Quarkonium TG meeting will be tomorrow at 9:30AM ET. 

 

We have the following talks on the agenda:

  • Introduction: co-convenors
  • Calibration need In preparation for Day-1 Physics in Run23
  • Electron id update - Weihu Ma 
  • D-meson pair correlation - Long Ma, Xiaozhou Yu
  • Quarkonium simulations - Anders Knospe
  • Tracking performance in jet – Dan Lis

 

Please join us via:

https://indico.bnl.gov/event/16639/

 

We look forward to meeting you then.

 

Best regards

Cameron, Jin, Tony and Marzia

 

 

 

______________________________

 

Jin HUANG

 

Physicist, Ph.D.

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

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