[clas12_rgk] [EXTERNAL] Reminder: RG-K meeting tomorrow at 11:45 am Jlab time

[Joshua Artem Tan]

Dear All,


Please find the slides in the attachment.


Starting with slide 12, we wanted to evaluate the FTCAL cuts as set up 
on the DVCS wagon and possibly refine it.

1) Check the quality of FTCAL photons per crystal (slide 13: FTCAL hits 
binned following the detector's crystal component with (left) 
coordinates given in REC::ForwardTagger bank and (right) arbitrary 
discreet coordinates adopted to tag each crystal).

2) Check DVCS exclusivity variables for each crystal (slide 14: example 
from crystal bin (4,12)):

     a) #Delta#theta_cone(#gamma): angle between the momenta of the 
reconstructed/detected photon and of the photon calculated from proton 
and electron momenta; the fit is a "half Gaussian" with the peak/mean 
fixed at the highest point of the histogram; this may not be the best 
distribution but should be good enough for the purpose of comparison.

     b) M_X_(ep->e'#gamma'): missing proton mass; Gaussian fit.

     c) p_#rho_X_(ep->e'p'#gamma): missing transverse momentum; "half 
Gaussian" fit with the peak/mean fixed at the highest point of the 
distribution.

     d) E_X_(ep->e'p'#gamma): missing energy;Gaussian fit.

3) Evaluate the crystals by comparing the mean and sigma of the fits of 
their corresponding exclusivity variables (slide 15: example from the 
strip at x = 7, note the outliers at y = 15, see slide 16, and y = 7, 
see slide 17).

4) Consider applying more fiducial cuts (as described in slides 18 and 19).

5) Check the effect of the additional fiducial cuts on the outliers 
(slide 20: example from the strip at x = 7, note that the cuts got rid 
of the outlier at y = 2, but not at y = 15 (see slide 21)).

6) Summary:

     a) The default cut of the DVCS Wagon allowed poorly reconstructed 
events from the hot spots.

     b) The implementation of additional cuts (basically little 
expansions of the default ones) got rid of poorly reconstructed events 
or, in some cases, whole crystal channels associated with these events.

     c) The only set of poorly reconstructed events observed that passed 
the additional cuts are those from (7, 15) which can be explicitly excluded.

I would appreciate your response for discussions.


Best regards,


Josh


On 6/7/2022 6:03 PM, Annalisa D'Angelo wrote:
>
> Dear All,
>
> this is a reminder of tomorrow RG-K meeting at 11:45 am Jlab time.  I 
> will be on a train so should my connection be poor I would ask Volker 
> to chair the meeting.
>
> The usual zoom link is:
>
> https://jlab-org.zoomgov.com/j/1618355349?pwd=YTF5cUxhWW1IK0YrK0xNUkNCbEhkdz09
>
> The passcode (if required) is: *307233*
>
> Meeting ID: 161 835 5349
> Passcode: 307233
>
> All the best
>
> Volker and Annalisa
> -- 
> ================================================
> Prof. Annalisa D'Angelo
> Dip. Fisica, Universita' di Roma "Tor Vergata"
> Istituto Nazionale di Fisica Nucleare
> Sezione di Roma Tor Vergata, Rome Italy
> email:annalisa.dangelo at roma2.infn.it  
> Jefferson Laboratory, Newport News, VA USA
> Email:annalisa at jlab.org
> Tel: + 39 06 72594562
>
> _______________________________________________
> clas12_rgk mailing list
> clas12_rgk at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas12_rgk

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