Hi Alex,
I am writing you on behalf of Pavish from the RICH group who is working on improving the matching of RICH rings to tracks. As you might know there are still quite some rings falsely matched to hadron (mostly pion or proton) tracks which make them very difficult to reject with PID cuts in the analysis. Many of these rings stem from conversion electrons which often are produced in/behind the STS and therefore are not tracked in the global tracking.
Pavishs idea was now to make use of the TRD tracking: If the conversion electrons fly through the TRD and are tracked one could extrapolate the TRD track to the RICH plane and possibly match the ring to the track which is closest, regardless of weather it has an STS track or not.
For this, he asked for information about the TRD tracking. Is there some documentation about this? Do I understand it correctly that we first combine TRD hits to TRD tracks which are then matched to STS tracks?
Kind regards and a nice weekend
Adrian
PS: I hope if formulated your questions correctly Pavish, feel free to specify
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Hi Alex,
Many thanks for the mail, and to you too Adrian for the forward.
It is good to hear that secondary electron tracking using TRD was under swing.
I have attached a figure, which might show the impact of secondary particles in macro numbers.
As a first step what I do hope to learn is the the following in the "current setup",
1. Hits - cluster processing in TRD.
2. STS-TRD matching.
Just to get an idea of possible use of extrapolated electron tracks to rich mirror (or entrance),
to make ring pair elimination.
I do not have complete thing worked out. All in all "Just asking" .
I think Christian will mail so that we TRD + RICH could have a group chat and we can discuss further.
Best regards,
Pavish