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Great! If I understand correctly you have not yet exploited the candidate by candidate information which is now in the ntuple, that could improve the situation (in particular the tails), correct? I will read the document more carefully later. thanks ric ______________________________________________________ Riccardo Faccini U.C. San Diego, Universita' "La Sapienza" & I.N.F.N. Roma tel +39/06/49914338 http://www.slac.stanford.edu/~rfaccini Univ. La Sapienza. 2,Ple Aldo Moro, I-00100 Roma Dipartimento di Fisica "A voice said to me: 'smile and be happy, things could be worse'. I smiled and was happy and indeed things got worse" (an office in Ferrara) On Tue, 6 Nov 2001, Oliver Buchmueller wrote: > > Dear All, > > as promised, the technical development of a > kinematic fit for semileptonic B events is > now finalized. All technical aspects have been > tested successfully (e.g. zero mass for neutrino, > overall constraint fullfillment,...). > The fit uses the whole event information including > not only the leptonic B decay but also the fully > reconstructed B candidate on the "other side". > Hence, not only energy momentum conservation but > also additional mass constraints like Equal Mass > or B Mass hypothesis can be used. > > For those who might be interested in details, > I have made a short node describing the technical > and physical aspects of this tool. Some performance > test are also shown in this note. > > The note can be found in: > http://www.slac.stanford.edu/~buchmuel/B-xlv_kinfit.ps > > This test indicates that's variables build out of > information from X-system AND neutrino (missing momentum) > are the most promising once in terms of "resolution improvements". > The results also suggest that more work has to > invested in the improvement of the X-system reconstruction > because it seems to be the limiting part in the > kinematic reconstruction. > > > I am looking forward to see your reaction/remarks/comments. > > Cheers, > > Oliver > > > By the way, > > this is clearly not the final word concerning kinematic fitting > of the semileptonic events ... it more supposed to be a start ...! > > > >