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code for analysis production of Diphoton PbPb2023

Pedro Nogarolli requested to merge pheinnog/diphotonPbPb2023 into master

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.

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