[Hybrid baryons] [clas12_rgk] [EXTERNAL] Reminder: RGK meeting tomorrow at 8:00 Jlab

[Francois-Xavier Girod]

Dear all

As a follow up from Friday's meeting, Anna agreed to provide me with her
eppi0 simulation files so I can take a look with my code

I posted some slides summarizing my findings on the docDB page here
https://clas12-docdb.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=637

I think that most of the background Anna observed comes from photons
generated by the electron bremsstrahlung
One can mostly remove all this background with a simple cut on the angle
between electron and photon > 7 degrees
The generated kinematics indicates that such a cut should be fine

In addition I applied a set of exclusivity cuts similar to what I used for
the deep pi0 selection
Note that the values of these cuts should be adjusted for the analysis of
the data, but overall I expect they would help clean up the backgrounds
from other reactions as well

In general it seems prudent to remove photons around the electron
direction, unless one is directly interested in bremsstrahlung events

Best regards
FX


On Thu, Apr 23, 2020 at 7:52 PM Annalisa D'Angelo <
annalisa.dangelo at roma2.infn.it> wrote:

> Dear All,
>
> this is a reminder of tomorrow RGK meeting at 8:00 am Jlab time.
>
> The bluejeans link is:
>
> https://jlab.bluejeans.com/214576976
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab.bluejeans.com_214576976&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=t2OnxVoP8YJyzuxpHKwj1tmrMj6s1mZ4pgV16sZJZb8&m=Xv8He5Zu2WrGWdLaLCq_bbPgPtJyiHCbvGjBnZJp-3w&s=D1duBcnVCXxtVPUS7bfmvQQ1grPEM014tffjotoLbFw&e=>
>
>
> 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 Italyemail:annalisa.dangelo at roma2.infn.it
> Jefferson Laboratory, Newport News, VA USA
> Email: annalisa at jlab.org
> Tel: + 39 06 72594562
>
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>
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