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Hi Urs, it requires little more work but it is technically feasible. ciao ric ______________________________________________________ Riccardo Faccini Universita' "La Sapienza" & I.N.F.N. Roma tel +39/06/49914798 Fax.: +39/06/4957697 http://www.slac.stanford.edu/~rfaccini Univ. La Sapienza. 2,Ple Aldo Moro, I-00185 Roma Dipartimento di Fisica "I don't understand what you say, but I believe I disagree" On Wed, 14 Apr 2004, Urs Langenegger wrote: > > Hoi Ric, > > I realized one drawback (for b->s gamma, not us): Filtering on the > tagbits precludes dumping all true signal events. This was a point > specifically raised by Henning. Is there the possibility to filter on > the truth block? > > Of course we can skip the tagfilter business and just save diskspace > by dumping events with either > > reco'ed lepton or photon > true b -> s gamma > true b->u l nu (?) > > I am not 100% familiar with the terminology of "PID weighting", but > even PID killing is fine as long as we have data/MC PidTables. > > Another drawback is brem recovery if the cut-off is high. But I think > the diskspace gains would be high enough even when requiring a lepton > with p*>0.5GeV (i.e. effectively the same cutoff as now). > > Cheers, > --U. > > > Riccardo Faccini writes: > > Hi Everybody, > > regardless of the availability or not of the hbook disk space, I think we > > need to seriously consider the option of saving only events with an > > energetic lepton or photon. I would also consider applying a purity cut > > (looser than the final one) at the ntuple generation level. > > > > I would say that, assuming we use PID weighting for PID systematics, the > > semileptonic and b->s gamma analyses would not be affected. > > > > While I test the filter to do this, does anybody see any drawback on such > > a decision? > > ciao > > ric > > >