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["Fisyak, Yuri V" <fisyak AT bnl.gov>]

Hi Chenliang and Frank,

Thank you for the dEdx calibration with ToF. It is very interesting.

Without ToF I don’t see the effect. This is my standard QA plots for dE/dx obtain with dev version of libraries and all calibration is in data base.

There are two thing which I don’t understand in your presentation:

1. Our calibration point is 2.54 keV/cm at MIP, which beta*gamma = 3.77, and for pion this p = 0.526 GeV/c, TMath::Log10(0.526) = -0.28
2. You see 2.6 keV/cm at p = 0.4 GeV/c, TMath::Log10(0.4) = -0.4. I don’t understand how it shifted. Muons  ? TMath::Log10(3.77*0.1056584) = -0.4. Look alike.

 

 

                                                              Yuri Fisyak

STAR                                           Phone: +1 631 344 3913
Brookhaven National Laboratory  Fax:    +1 631 344 4206
510A/1-161
http://www.star.bnl.gov/~fisyak       E-mail: fisyak AT bnl.gov

 

 

 

From: Star-tpc-l <star-tpc-l-bounces AT lists.bnl.gov> on behalf of Frank Geurts via Star-tpc-l <Star-tpc-l AT lists.bnl.gov>
Reply-To: Frank Geurts <geurts AT rice.edu>
Date: Monday, September 26, 2022 at 5:34 PM
To: "Star-tpc-l AT lists.bnl.gov" <Star-tpc-l AT lists.bnl.gov>
Subject: [Star-tpc-l] Fwd: [Star-lfsupc-l] Run21 7.7GeV dEdx report

 

Hello TPC folks,

 

Chenliang is not on this list, so i am forwarding his findings to you on his behalf. His observation is that he sees the nsigma(e,pi)  issue in 7.7GeV reflected in a change of the dE/dx calibration as well.

 

Best,

-Frank

 

 

 

Begin forwarded message:

 

From: Chenliang Jin via Star-lfsupc-l <star-lfsupc-l AT lists.bnl.gov>

Subject: [Star-lfsupc-l] Run21 7.7GeV dEdx report

Date: September 26, 2022 at 4:27:55 PM CDT

To: star-lfsupc-l AT lists.bnl.gov

Reply-To: Chenliang Jin <cj17 AT rice.edu>, star-lfsupc-l AT lists.bnl.gov

 

Dear conveners and all,

 

This is the following study of the nSigmaPion issue I have reported several weeks ago. We have checked the dE/dx plots and you can find the summary in this page:

https://drupal.star.bnl.gov/STAR/system/files/Run21%207.7GeV%20dEdx%20report.pdf

If you are interested in more detail, you can look into this page:

https://drupal.star.bnl.gov/STAR/blog/cj17/Run21-77Gev-dEdx-report

 

Sincerely,

Chenliang Jin

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