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Hi Clare they are computed in CompositionUtils in CompB0BchNtupleFiller::appendBRecoil and they are defined including neutrals ciao 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 "We need serenity to accept what we cannot change, courage to change what we can and wisdom to distinguish between the two" [R. Kiplin, allegedly] On Wed, 30 Oct 2002, Clare Louise Brown wrote: > Hi All, > > I am using the rootfiles generated with IslBrecoilUser to study b->sgamma. > I want to look at the variables cosTBB0 and cosTBChB which represent the > cos of the angle between the thrust of the recoil B and the thrust of the > reconstructed B, as the exclusive b->sgamma group have shown that this > should differ for signal and background. > > These variables are in the ntuples generated, however I cannot find the > code where they are calculated. Please can someone tell me how these > variables are formed? > Also, I have found that in the first few rootfiles only, of genbb, gencc > and genuds, for example: > /nfs/farm/babar/AWG8/ISL/sx-071802/genuds/output/outputdir/genuds-2000-old2000-2.root > /nfs/farm/babar/AWG8/ISL/sx-071802/gencc/output/outputdir/gencc-2000-old2000-6.root > /nfs/farm/babar/AWG8/ISL/sx-071802/gen_prod/B0/output/outputdir/genB0-2000-new2000-1.root > > either the cosTBB0 or cosTBChB is filled with zero. Can anyone explain this? > > Cheers > Clare > > >