sPHENIX discussion of physics

["Dean, Cameron" <cdean AT bnl.gov>]

Hi all,

To respond to some comments about updating KFParticle to allow you to select tracks with a minimum number of MVTX or TPC hits, and to add a flag to stop extrapolating the tracks back to the SV (which caused mass splitting in K-short analyses), this PR is now going through Jenkins, https://github.com/sPHENIX-Collaboration/coresoftware/pull/1908.

Please note, I only tested this against gcc, clang and cppcheck. This has NOT been checked to run in KFParticle for unintended behaviour.

Cheers,

Cameron

On Mar 24, 2023, at 4:50 PM, Huang, Jin via sPHENIX-upsilons-l <Sphenix-upsilons-l AT lists.bnl.gov> wrote:

Introduction

 

• Please use the new TG data disk area : /sphenix/tg/tg01/hf 
• Many HF production request has been processed, analysis can start: https://docs.google.com/document/d/1dc-HX-Dd4acezxw0tRvvvf1Wq-4XGUBIRLYhJbRRdIY/edit?usp=sharing 
• First version of general tracking quality analysis cut recommendation:https://wiki.sphenix.bnl.gov/index.php/Track_Quality_Cuts 

• Note cuts are analysis cuts, current wiki value only select prompt cuts. 

 

Cameron and Derek will also add the cuts avaialble in KFParticle 

Dennis: it will be useful to have list of cuts and motivations (e.g. high pT in jet, low pT in HF); vz is event level cut, which may be a separate event cut recommendation page; nmaps = 3 or 4 was recommended as tracks could pick up more than one cluster per layer

 

Xin/Joe: efficiency is about 80% but the missing layer could damage the acceptance. Furthermore, two-layer could be sufficient for HF

Tony: To be addressed in the future to allow two layer 

Tony: Only TPC tracks may be used e.g. conversion electron

 

 

K-short reconstruction with distortions¶ - Zhaozhong 

 

Zhaozhong: crosschecked Joe's plot on momentum scale and resolution with/without residual distortion.

Joe: distortion could change the track momentum scale. Residual distortion is at O(1) hundred um level. 

Xin: Suggest studying inner track matching precision and efficiency with and without distortion. 

Joe: We can still connect TPC -> MVTX. Vertex DCA was stable. Effect not yet quantified in detail.

 

 

Slide 10: 

It is hard to interpret after integrating a large momentum range given the large dependence on tracking performance over pT

 

Cameron: HIJING analysis was before a change, which now allows both TPC-only and TPC-MVTX tracks  

Tony/Xin: TPC-MVTX should have inv. mass of 3MeV, TPC-only should have a good resolution too (6MeV). The wider peak may be a reco problem due to the track propagation in the field. 

Cameron: to look into it, which expects to have a switch to enable momentum production

 

 

Tony: high pT K0s may get lost due to the loss of a secondary vertex beyond the MVTX first layer. 

Jin: need to fix inv. mass first. 

Tony: for eval analysis, please use Reese Boucher's macro for 2nd vertex correction 

 

 

 

D0 in AuAu plot update for HP23¶ Cameron Dean

 

Xin: Error bar on pull all has the same size (as expected for pull)

Cameron: blue and magenta have fixed ratio to describe the D0 peak 

Tony/Joe: please highlight the length of the data taking is small (25min) to avoid misunderstanding of marginal measurement at sPHENIX. 

Joe: pile up should be noted. 

 

 

 

______________________________

 

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-upsilons-l <sphenix-upsilons-l-bounces AT lists.bnl.gov> On Behalf Of Huang, Jin via sPHENIX-upsilons-l
Sent: Thursday, March 23, 2023 12:37 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
Subject: [Sphenix-upsilons-l] Reminder: HF/Q TG Meeting Friday at 3pm ET

 

Dear all

 

Reminder of our joint Heavy Flavor/Quarkonium TG meeting Friday at 3pm ET. 

Currently on the agenda at https://indico.bnl.gov/event/18852/ we have:
 
•    Introduction - Conveners
•    K-short reconstruction with distortions - Zhaozhong Shi
•   D0 in AuAu plot update – Cameron Dean
 
The zoom link is bnl.zoomgov.com/j/1613938007?pwd=QjYzUnpYQ2xNZWZLSy9qd3Z4dFpzZz09
 
We look forward to talking to you!

Marzia, Cameron, Jin, and Tony

 

 

 

______________________________

 

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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