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

Hi Chenliang, your claim is that pbar M² is always higher  than p (pbar > p)

 

I have made some comparison for p/pbar M² using old and new calibration samples: https://www.star.bnl.gov/~fisyak/star/ppbarM2/

My observations are :

1. 14p5GeV_2019:

1. for new calib2 sample: pbar >  p  .
2. for old (14GeV_2019 TFG express production) and (2019/14p5GeV_2019_P23id) : p and pbar M² are matched.

19GeV_2019:

1. 19GeV_2019_TFG19e express production: p and pbar are matched
2. 19GeV_2019_P21ia:   pbar < p
3. 19GeV_2019_P24iy_calib, ExB, BTOF not calibrated : pbar > p
4. 19GeV_2019_P24iy_calib3, no ExB, BTOF calibrated:  pbar < p (?)

 

I don’t have a conclusion. Except, that I might see effects of static and  dynamic distortions and BToF calibration.

 

                                                              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-mtdtof-l-request AT lists.bnl.gov <star-mtdtof-l-request AT lists.bnl.gov> on behalf of Chenliang Jin <cj17 AT rice.edu>
Date: Friday, December 13, 2024 at 12:38 PM
To: Van Buren, Gene <gene AT bnl.gov>
Cc: star-tpc-l AT lists.bnl.gov <star-tpc-l AT lists.bnl.gov>, star-mtdtof-l AT lists.bnl.gov <star-mtdtof-l AT lists.bnl.gov>, Frank Geurts <geurts AT rice.edu>
Subject: [[STAR-mtdtof-l] ] Mass splitting of Run19 dataset with new TPC alignment

Dear Gene,

I checked both Run19 14.6GeV and 19.6GeV dataset produce this week. Charged particle mass splitting is observed again similar as Run21 OO 200GeV at two 19.6GeV (w./w.o. EB correction) and 14.6GeV data sample. The mass splitting at 19GeV without EB correction (produced in Dec.) is smaller than 19GeV dataset with EB correction (produced in Nov.). The mass splitting of 14GeV is slightly below the splitting of 19GeV with EB correction.

Here is the mass splitting plot and you can find more detail information from the slides in the attachment.

Sincerely,
Chenliang