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Hoi Daniele, in principle muon ID already contains a veto on kaon ID (that was built in to remove the kaon in-flight decays some time ago), so the fact that you see a small effect is maybe by having a different veto selector than what we use for kaon ID. I think the fix should be where the leading lepton is identified. It is a "feature" that kaon ID overrides muon ID. I don't think it affects our signal. Muons that are kaons should not enter the signal. Of course, it does affect the depleted sample. Cheers, --U.