sPHENIX is a new detector at RHIC.

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

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=1933

 

Upsilon RAA update - Sasha Lebedev

 

Summary: updated Upsilon R_AA uncertainty with more detailed background estimation. New study suggests much larger background for Upsilon 2S 3S with the consideration of hadron species and momentum dependent hadron ID on EMCal.

 

Discussion:

Tony: revised hadron background seems caused major drop in S/B, that leads to this update

Tony: MIE used counting of Upsilon and background events in given inv mass integral

Jin: can we reproduce proposal background estimation using the constant electron ID approximation (70% efficiency + 90:1 hadron rejection independent of pT and hadron species)?

Tony: also suggest cross check hadron background by regenerating background without anti-protons

Tony: what hadron R_AA used in simulation?

Sasha: need to double check

 

Further comments on HF program:

Tony: emerging consensus among world experts is that reference should be open charm/bottom cross section. Alice expect to measure open HF in good precision in Run3. Need to keep thinking about open HF in sPHENIX with improved precision in B->J/Psi, and D->K+pi. Need to consider possible PID in  TPC dE/dx.

 

 

GenFit update - Haiwang Yu

 

Update 1: return path-length with measured states. Update carried in pull request #201

 

Tony: how the path length defined

Haiwang: length particle travels calculated from a arbitrary reference measurement point, which could be positive value towards the calorimeter or negative towards the primary vertex. Useful for time-of-flight and sorting out track states.

 

Update 2: tracing down reason of non-perfect DCA and momentum pull distribution by check fast simulations. Result suggest Kalman filter is correct, but the problem points to bias in cluster center and uncertainty reconstruction, which is input to Kalman filter.

 

Jin: suggest also check pull distribution on pT fit

Jin: slide4/5. three steps jumped between the comparison: 1) ladder VS cylindrical 2) MAPS & TPC digitization/clustering VS ideal clustering 3) Alan's fit VS GenFit. Suggest only change step 2 while keep the other two identical to isolate out the clustering effect.

 

 

 

______________________________

 

Jin HUANG, Ph. D.

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: Huang, Jin
Sent: Monday, October 24, 2016 11:58 AM
To: 'sphenix-software-l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>; 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>
Subject: [reminder] sPHENIX simulation and software meeting, Tue Oct 25th, 1PM EST @ 2-219

 

Hello everyone,

 

This is a reminder for a regular sPHENIX simulation and software meeting, Tue Oct 25th, 1PM EST @ 2-219

 

Currently on agenda are updates to last week's studies:

•            Upsilon R_AA projection update - Sasha Lebedev

•            GenFit2 with path-length calculation  - Haiwang Yu

Please let us know if you have further topics to be presented at this meeting.  

 

The agenda page is at https://indico.bnl.gov/conferenceDisplay.py?confId=1933   , for which the common modification password is "1008"

•            For residents at BNL, we will meet at the 2-219 conference room

•            To join the Meeting via phone bridge:  https://bluejeans.com/619960505 

•            To join via Phone:

1) Dial:

        +1.408.740.7256

        +1.888.240.2560(US Toll Free)

        +1.408.317.9253(Alternate number)

        (see all numbers - http://bluejeans.com/numbers)

2) Enter Conference ID: 619960505

 

Cheers,

 

Jin

 

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________