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["Ma, Rongrong" <marr AT bnl.gov>]

Hi Yuri

Just realized that in Run23, we were running with low luminosity the entire time. So there should not be much of a difference in luminosity between st_physics and st_mtd. I was thinking of Run25 where MTD data is mainly recorded with high luminosity while MB data with low luminosity. Sorry for the confusion. 

On the other hand, dimuon-vpd100 trigger is highly biased towards central events regardless of the luminosity. So if one plots mean dE/dx vs. refMult, one might see an increasing deviation from 0 towards large refMult and the two streams might agree better. 

Best

Rongrong

On Nov 20, 2025, at 11:31 AM, Fisyak, Yuri V <fisyak AT bnl.gov> wrote:

Hi Rongrong,  

    I have surprise to see the difference.  I see the most of difference is coming from inner sector.

st_mtd stream has 

st_mtd TriggerIds: 900031|23|900631|

from run browser I see 

mb-hlt100                                         400000                 23           [CP]  47    1097395           1.1 M         0%

zdc_mb                                                      20          900031      [CP]  1430  5707225601                 5.71 B 67.1%

dimuon-vpd100     800000000000000                    900631      [CP]  722   5379371           5.38 M  0.1%

i.e. mtd stream mainly defined by dimuon-vpd100 

What does that mean in sense of luminosity and centrality ?

                                                              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: Ma, Rongrong <marr AT bnl.gov>
Date: Thursday, November 20, 2025 at 11:17 AM
To: Fisyak, Yuri V <fisyak AT bnl.gov>
Cc: Witt, Richard CIV USNA Annapolis <witt AT usna.edu>, Star-tpc L <Star-tpc-l AT lists.bnl.gov>
Subject: Re: [[Star-tpc-l] ] TPC Meeting Today

Hi Yuri

For the difference in dE/dx between st_physics and st_mtd streams, could it be due to different luminosity and centrality ranges sampled by these two streams? I think the st_mtd stream is biased towards high luminosity and central events. 

Thanks. 

Best

Rongrong

On Nov 20, 2025, at 10:04 AM, Fisyak, Yuri V <fisyak AT bnl.gov> wrote:

Hello, I would like to show a few slides about hit errors and comparison dE/dx from physics and mid streams for AuAU200 2023

https://drupal.star.bnl.gov/STAR/event/2025/11/20/Weekly-TPC-Meeting

                                                              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-request AT lists.bnl.gov <star-tpc-l-request AT lists.bnl.gov> on behalf of Richard Witt <star-tpc-l AT lists.bnl.gov>
Date: Thursday, November 20, 2025 at 7:39 AM
To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
Subject: [[Star-tpc-l] ] TPC Meeting Today

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