[Clas12_deepana] DVCS analysis: Removal of the radiative elastic proton band

[Guillaume CHRISTIAENS]

Dear all,

Thanks for the feedback during the meeting,
In order to understand and remove this proton band, I have plotted the 
angle between the final electron and the final photon as suggested.
Indeed this band corresponds to radiative photons since the angle 
between final electron and final photon has a peak at 0 in this band.

I've added a 4 degree cut on this angle you can see the effect attached, 
in the first plot is proton momentum vs proton theta after the cut while 
in the second plot is proton momentum vs proton theta for the events 
rejected by this cut which correspond exactly to our proton band.

I've recomputed my contamination and asymmetries by taking this into 
account (attached too). Since this cut removes only 3% of the data (the 
proton plot is in log scale), the effect is small.

Please let me know if you have any comments about this,

Best regards,

Guillaume

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