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Hi Urs, I had a discussion with Riccardo about this. Since the we keep the muon ID done at the Beta level (we don't reweight it at ntuple level) we could leave the two things separated and do not apply again the Kaon rejection. We would be in favour of leaving things the way they are now in the HEAD. BTW if we put kaon ID also for the leading lepton the effect will be even smaller (o(10-3)) since it will be reduced since we measure a ratio of BRs. It is not a very crucial issue and we don't have a strong opinion on this. 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. > >