Bug on B->KJ/psi MC ? #49359
Description
Dear all,
We have noticed that there is an issue with several MC events. The issue is that we observe muons from J/psi decay to go first through photons [*]. The sample is /BuToJpsiK-JpsiToMuMu_Fil-MuPt2_TuneCP5_13p6TeV_pythia8-evtgen/RunIII2024Summer24MiniAODv6-150X_mcRun3_2024_realistic_v2-v2/MINIAODSIM. In 2022 2023 sample we do not have this problem. Some event numbers are shown in the print out.
Best,
George
[*] evt 987550772
Muon pdg -13 mother 22 grandmother 443
Muon pdg 13 mother 22 grandmother 443
evt 987550784
Muon pdg -13 mother 22 grandmother 443
Muon pdg 13 mother 22 grandmother 443
evt 987551009
Muon pdg -13 mother 22 grandmother 411
Muon pdg -13 mother 22 grandmother 443
Muon pdg 13 mother 22 grandmother 443
evt 987551087
Muon pdg -13 mother 22 grandmother 443
Muon pdg 13 mother 22 grandmother 443
evt 987550884
Muon pdg -13 mother 22 grandmother 443
Muon pdg 13 mother 22 grandmother 443