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[Tonko Ljubicic <tonko AT bnl.gov>]

Hello,

Christian found and fixed the problem. It was on the DAQ PC side.

           -- Tonko

On Tue, Mar 14, 2023 at 6:23 AM Van Buren, Gene via Star-tpc-l
<star-tpc-l AT lists.bnl.gov> wrote:
>
> Rough efficiency plots resulting from the loss of those two RDOs are 
> attached as phi vs. eta for global tracks from ~1500 Run 19 AuAu200 events. 
> First for all global tracks, and then with a 25 hit requirement.
>
> For all globals, we can see that there isn't much impact for eta < 1 (the 
> loss of hits doesn't keep the tracks from being found), but there's up to 
> ~50% loss for tracks going through that sector at high eta where the tracks 
> are shorter to begin with.
>
> For the 25+ hit globals, we can see that the losses extend over a much 
> larger range of eta because tracks drop below the cut on number of hits, 
> with a larger efficiency drop than I expected. I'll investigate a little 
> more and make a blog post.
>
> -Gene
>
> On Mar 13, 2023, at 4:38 PM, Van Buren, Gene via Star-tpc-l 
> <star-tpc-l AT lists.bnl.gov> wrote:
>
> Hi, Flemming and all....
>
> On Mar 13, 2023, at 4:29 PM, videbaek via Star-tpc-l 
> <Star-tpc-l AT lists.bnl.gov> wrote:
> iii) Gene, what is an estimated loss of efficiency for tracks in sector 8 
> with these two RDOs out? We ned some estimate on the loss of physics f this 
> is not resolved.
>
>
> ....I seem to remember a similar study being done before, but I don't 
> remember where it is nor whether it was pre- iTPC. What I can do relatively 
> quickly is take some Run 19 AuAu200 data and process a few hundred events 
> with and without those two RDOs and look at the distributions of lost 
> tracks. Yuri may actually be more efficiently set up for a such a study 
> than me, but I understand he's got plenty else on his plate.
>
> Carrying those inefficiencies through to impact on loss of physics would 
> likely require PWG/analyzer involvement.
>
> -Gene
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