[Halld-pid] Start Counter Meeting Minutes, November 16, 2017

[Mark Ito]

Folks,

Please find the minutes below and at

  https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_16,_2017#Minutes .

   - Mark

__________________________________


    GlueX Start Counter Meeting, November 16, 2017, Minutes

Present:

  * *FIU *: Mahmoud Kamel
  * *JLab *: Thomas Britton, Eugene Chudakov, Mark Ito (chair)

There is a recording of this meeting <https://bluejeans.com/s/hoRYA> on 
the BlueJeans site <https://jlab.bluejeans.com/>. Use your JLab 
credentials to authenticate.


      Announcements

Mark noted that the next step in run preparation is to complete Hot 
check-Out for the start counter. That should start this week.


      Review minutes from the last meeting

We went over the minutes from November 2 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_November_2,_2017#Minutes>. 


Mahmoud asked for 5 M bggen events from Thomas once the code from the 
impending reconstruction launch stabilizes. These will be used for 
comparison between Monte Carlo and data.


      Update on attenuation corrections

Mahmoud presented slides on his latest work 
<https://halldweb.jlab.org/talks/2017/SC_Meeting_11_16_2017.pdf> on 
attenuation corrections. He fits the dE/dx distribution in each paddle 
separately for different bins in distance-from-photo-detector. He then 
fits to two exponentials, one in the straight section, one in the 
bend+nose section where the continuity between the two is enforced at 
the boundary. The resulting correction makes a visible improvement in 
proton-pion separation. Please see his slide for details.


      NIM Paper

Mahmoud finished all of the requested attenuation plots for the paper 
and passed them on to Werner Boeglin.


-- 
Mark Ito, marki at jlab.org, (757)269-5295

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