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[Sphenix-calibration-l] On tracks hitting the GEMS

From: Hugo Pereira Da Costa <hugo.pereira-da-costa AT cea.fr>
To: sPHENIX-calibration-l <sphenix-calibration-l AT lists.bnl.gov>, VANDENBROUCKE Maxence <Maxence.VANDENBROUCKE AT cea.fr>, Tom Hemmick <tkhemmick AT gmail.com>
Subject: [Sphenix-calibration-l] On tracks hitting the GEMS
Date: Tue, 22 Sep 2020 11:49:40 -0600

Hi all,

following the discussion at today's meeting and the suggestion by Maxence to look at tracks that exit in the TPC GEMS, it turns out I have a plot illustrating this already.

See: https://indico.bnl.gov/event/9399/contributions/41425/attachments/30407/47645/talk.pdf slide 4 right plot (also attached)

This is the statistics we get in r,z plane for tracks that have hits in MVTX and INTT, with no micromegas requirement and a pT cut at 0.5 GeV/c

You can see that there is no entry in front of the GEM planes for r < 60cm

(In contrast you can compare to the plot on next slide, where Micromegas are required)

I think that what you see on the plot is a combination of dN/deta falling with eta, and the MVTX and INTT acceptance

Hugo

Attachment: radiograph.png
Description: PNG image

[Sphenix-calibration-l] On tracks hitting the GEMS, Hugo Pereira Da Costa, 09/22/2020