Star-tpc-l mailing list

[Chenliang Jin <cj17 AT rice.edu>]

The new BTOF alignment for all of the Run19 datasets with new TPC alignment is not in DB.

Fisyak, Yuri V <fisyak AT bnl.gov>于2024年12月13日 周五下午12:50写道：

Frank, please confirm: new BTOF alignment is not in DB ?

 

                                                              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

 

 

 

-----Original Message-----
From: star-mtdtof-l-request AT lists.bnl.gov <star-mtdtof-l-request AT lists.bnl.gov> on behalf of Frank Geurts <geurts AT rice.edu>
Date: Friday, December 13, 2024 at 1:44 PM
To: star-mtdtof-l AT lists.bnl.gov <star-mtdtof-l AT lists.bnl.gov>
Cc: Van Buren, Gene <gene AT bnl.gov>, star-tpc-l AT lists.bnl.gov <star-tpc-l AT lists.bnl.gov>
Subject: Re: [[STAR-mtdtof-l] ] Mass splitting of Run19 dataset with new TPC alignment

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>