Issues related to DVCS photon and proton reco

DVCS ep events (with crossing angle after-burner applied) has been passed thru full ATHENA simulations. Two observations:

1. DVCS real photon reconstruction is missing eta>0, comparing to MC distribution.
2. DVCS scattered proton, REC eta distribution shifts to high eta comparing to MC distribution

photon.pdf

photon_eta.pdf

proton_eta.pdf

Instruction to reproduce these plots, see the following gitlab link:

https://eicweb.phy.anl.gov/EIC/benchmarks/physics_benchmarks/-/tree/diffractive-phi-benchmarks/benchmarks/dvcs-d

run

dvcs-d.sh

will run the full chain of reco and analysis.