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[Frank Geurts <geurts AT rice.edu>]

Quick correction in Yuri’s comment:

The BTOF calibration in all cases does not change.  The only thing that 
Chenliang looks at is the alignment between TPC and BTOF. His work includes a 
minor change to the BTOF’s T0, but this applies to all tracks and cannot 
explain differently charged tracks to show mass^2 splitting.

-fg


> On Dec 13, 2024, at 12:32 PM, Fisyak, Yuri V <fisyak AT bnl.gov> wrote:
>
> 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 :
>     • 14p5GeV_2019:
>         • for new calib2 sample: pbar >  p  .
>         • for old (14GeV_2019 TFG express production) and 
> (2019/14p5GeV_2019_P23id) : p and pbar M2are matched.
>     • 19GeV_2019:
>         • 19GeV_2019_TFG19e express production: p and pbar are matched
>         • 19GeV_2019_P21ia:   pbar < p
>         • 19GeV_2019_P24iy_calib, ExB, BTOF not calibrated : pbar > p
>         • 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<PastedGraphic-1.png>

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