Star-tpc-l mailing list

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

Hi Flemming, yes, I had problems with dE/dx corrections for Run 16-18 due to 
increased threshold, and this was a reason to reduce the threshold for TPX in 
BES2.
Since I have revisited dE/dx model to address these problems.
Anyway, new TPC23 cluster finder will require another revision of dEdx model.
I don't see that dE/dx is showstopper to increase TPX threshold in runs 23-25.
Let's discuss this on 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 
<mailto:fisyak AT bnl.gov> 





-----Original Message-----
From: Star-tpc-l <star-tpc-l-bounces AT lists.bnl.gov 
<mailto:star-tpc-l-bounces AT lists.bnl.gov>> on behalf of videbaek via 
Star-tpc-l <Star-tpc-l AT lists.bnl.gov <mailto:Star-tpc-l AT lists.bnl.gov>>
Reply-To: "Videbaek, Flemming" <videbaek AT bnl.gov <mailto:videbaek AT bnl.gov>>
Date: Sunday, May 21, 2023 at 4:48 PM
To: Star-tpc L <Star-tpc-l AT lists.bnl.gov <mailto:Star-tpc-l AT lists.bnl.gov>>, 
"Ruan, Lijuan" <ruan AT bnl.gov <mailto:ruan AT bnl.gov>>, Frank Geurts 
<geurts AT rice.edu <mailto:geurts AT rice.edu>>
Subject: [Star-tpc-l] TPC ascii thresholds


Hi All,




Tonko send out an e-mail yesterday requesting that for the HI running in 
23 and 25 it is considered to change the trheshold for the TPC ascii's , 
in particular the ALTRO to 4 in order to reduce the data volume that is 
the limiting factor to achieve
the 4.5-5kHaz rate for Min Bias that is needed to get to the physics 
goals for these last runs.


At this point it is not the only limitations but is one of those.
seem to be found that for run 16
I looked back at some earlier information, in Irakli's blogs, and it 
seem to be found that for run 16-18
using threshold =4 was desirable (for tracking).
I also recall that from Yuri's presentations over the years that th=4 
causes a worse resolution for de/dxIs this correct and by how much.


It would be useful to understand what the physics goal requirements are 
for dE/dx.


We should have a discussion in the TPC group on this, but do also need 
input from PWG/ mgt what the requirements are


best regards
Flemming










-- 
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973


phone: 631-344-4106
cell : 631-681-1596
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