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Hi Daniele, they originate from non-resonant decays. For the very most of them I see the following: the direct mother of most of them is a non-resonant X_u (id 41 and 42, resp.). Also some of them have a Sigma0 as direct mother but in these cases, the decay is still flagged as non-resonant by fBVxbTyp (7 and -7, resp.). (I see some cases, where according to fBVxbTyp they do not originate from non-resonant decays. However, in most of these cases the mother is still a non-resonant X_u. My guess is that here the fBVxbTyp variable picked up the semileptonic decay from the other side while the signal side still was non-resonant.) Kerstin On Wed, 21 Jan 2004, Daniele del Re wrote: > > Hi Kerstin, > > two questions: > do you know if they are non-resonant or exclusive b->ulnu decays? > where do these sigmas come from (who is their mother)? > > Daniele > > > concerning the question from yesterday's meeting, where the Sigmas and > > Lambdas (on the signal side in signal MC) come from: In all the decays I > > checked they seem to come from a X_u decay from B -> Xu l nu and I found > > 23 decays of this kind (containing either a Sigma+, Sigma- or Lambda0 on > > the signal side) in the 100000 events I looked at (I used the > > non-reweighted vubmix). > > > > Kerstin > > > > >