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Generate TPC loopers only in the background transport when embedding #2524

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Generate TPC loopers only in the background transport when embedding #2524

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c12c033
Generate TPC loopers only in the background transport when embedding
sawenzel Oct 29, 2026
1f21226
Leave the loopers ownership to O2 and use -colBkg for both transports
sawenzel Oct 30, 2026
dfbf242
Apply the background's loopers settings to the signal as well
sawenzel Oct 30, 2026
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19 changes: 19 additions & 0 deletions MC/bin/o2dpg_sim_workflow.py
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Original file line number Diff line number Diff line change
Expand Up @@ -528,6 +528,25 @@ def extractVertexArgs(configKeyValuesStr, finalDiamondDict):
COLTYPEBKG=args.colBkg
havePbPb = (COLTYPE == 'PbPb' or (doembedding and COLTYPEBKG == "PbPb"))

# TPC loopers are a background effect: with embedding, background and signal get consistent loopers settings
if doembedding:
def loopersKeys(confkey):
return [kv.strip() for kv in confkey.split(';') if kv.strip().startswith('GenTPCLoopers.')]
def loopersVetoed(confkey):
return any(kv.split('=')[0].strip() == 'GenTPCLoopers.loopersVeto' and kv.split('=')[1].strip().lower() in ('true', '1')
for kv in loopersKeys(confkey))
if loopersVetoed(args.confKey) or loopersVetoed(args.confKeyBkg):
print('o2dpg_sim_workflow: TPC loopers switched off for background and signal')
args.confKeyBkg = args.confKeyBkg + ';GenTPCLoopers.loopersVeto=true'
args.confKey = args.confKey + ';GenTPCLoopers.loopersVeto=true'
else:
# Loopers settings given for either transport apply to both; the background's own settings take precedence.
# Both transports take colsys from -colBkg, as the loopers are a background effect.
# Which transport generates the loopers of a given collision is decided in O2, from the collision context itself.
signalLoopersKeys, bkgLoopersKeys = loopersKeys(args.confKey), loopersKeys(args.confKeyBkg)
args.confKeyBkg = ';'.join(signalLoopersKeys + ['GenTPCLoopers.colsys=' + COLTYPEBKG, args.confKeyBkg])
args.confKey = ';'.join(['GenTPCLoopers.colsys=' + COLTYPEBKG, args.confKey] + bkgLoopersKeys)

workflow={}
workflow['stages'] = []

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