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

[Marco Contalbrigo]

Hi Guillaume,
very good! Thanks for the fast check, that was
pretty effective.
Thanks, Marco.


On Thu, 10 Oct 2019, Guillaume CHRISTIAENS wrote:

> 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
>
>