code for analysis production of Diphoton PbPb2023
AP to study the diphoton spectrum with spruced data from PbPb 2023. With the previous APs production (!1067 (merged)) we found a severe source of low momentum dielectron background. Most of the background is at photon1/2_cos(phi)> 0.9. This AP has the objective of removing this large background source and allow an easier analysis since the previous AP ntuple has 400+ GB.