We had few email exchanges regarding the truth matching as it was applied to the b->sgamma event, to see whether there is anything which can be learnt for the semileptonic events. Here I start to forward the emails. ---------- Forwarded message ---------- Date: Tue, 30 Jan 2007 15:19:55 -0800 (PST) From: Francesca Di Lodovico <[log in to unmask]> To: Roberto Sacco <[log in to unmask]>, Antonio Petrella <[log in to unmask]>, Kerstin Tackmann <[log in to unmask]> Subject: b->sgamma pseudo truth matching Hi, as I mentioned at today's meeting, I just want to bring up how we did the truth-match in the b->sgamma analysis (that we call indeed pseudo truth-matching). The details are on BAD 768, v16, section 7.6. We distinguish between the fully truth matched events (for which all the daughters are truth matched to the B), and the onces which are not fully truth matched (where the reconstructed track have an associated GHit, and the reconstructed final state is the same than the true final state), and for which the reconstructed hadronic mass is within 50(25) MeV away from the true one. The sum of all the events makes the whole of the pseudo truth matched events. In our case, this method worked well. Could it be feasible for the semileptonic events? Do you see any drawback? Cheers Francesca ------------------------------------------------------------------------ | Francesca Di Lodovico Queen Mary, University of London | | E-mail:[log in to unmask] Physics Department | | Phone: +44-(0)20-7882-5035 Mile End Road | | Fax: +44-(0)20-8981-9465 London E1 4NS, UK | | http://hepwww.ph.qmul.ac.uk/phdir.html?F.R.Di_Lodovico&header=no | ------------------------------------------------------------------------