 |
 |
Correct, so far I am using an "overall cov matrix" for the event. However, technically the usage of event-by-event errors is foreseen and (hopefully) it should improve things even further - but not yet sure how to apply the event-by-event stuff to the X-system ... a bit more brain power has to go into this ..thought - Oliver On Tue, 6 Nov 2001, Riccardo Faccini wrote: > 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 ...! > > > > > > > > > >