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[PWGHF] Fix signDecay assignment in OmegaC QA KFParticle candidate creator - #18336
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Fix the signDecay assignment in the KFParticle reconstruction of Omegac0 to OmegaPi candidates in candidateCreatorXic0Omegac0Qa.cxx.
Previously, signDecay was assigned using the charge of the charm bachelor pion (trackCharmBachelor.sign()) instead of the cascade bachelor kaon (bachTrack.sign()).
This resulted in an incorrect charge-dependent assignment of the Lambda daughter PID hypotheses, causing a significant loss of candidates.