 |
 |
Anybody want to comment? I've started my study with a symmetric error of 0.65 but there's still time for change. :) Alessio ______________________________________________________ Alessio Sarti Universita' & I.N.F.N. Ferrara tel +39-0532-974328 Ferrara roma +39-06-49914338 SLAC +001-650-926-2972 "... e a un Dio 'fatti il culo' non credere mai..." (F. De Andre') "He was turning over in his mind an intresting new concept in Thau-dimensional physics which unified time, space, magnetism, gravity and, for some reason, broccoli". (T. Pratchett: "Pyramids") On Tue, 4 Feb 2003, Alessio Sarti wrote: > Hi all, > I've tried to understand what is the error that we want to use in our > theoretical sys study when varying the exclusive BRs. > The first point that needs to be clear is that I'm assuming that all the > various excl B->ulnu BR are related by isospin relations. > So, once evaluated the error, ALL the exclusive contributions can be > varied within the error by the same factor. > The problem now is what error can be quoted. > I've find out the papers were the measurement are discussed (they're > linked in http://www.slac.stanford.edu/~asarti/recoil/sys/theor_sys.html > webpage). Those are two cleo papers. > The last one is marked 16, Jan 2003. All the various measurements are > reviewed. It is clearly said that the only two indipendent measurements > are the B0 -> pi and B0 -> rho one, while all the others are obtained via > isospin correlations. > So I've focused my attention on them. > In the DECAY.DEC we have exactly the same values as those ones quoted in > PDG: so the error quoted in PDG directly applies to our excl. BR > measurement. The only attention must be paid weighting the errors coming > from rho and pi decays. Those two errors are slighlty different (+/- 60 > (symm) on pi and +0.6 -0.7 (asymm) for rho. > Should I do the weighted average of those two errors (given that the > values are exactly scaling with our DECAY.DEC value) and come up with an > asymm error or should I use a symm err of ~0.65 (reasonable error for > doing the sys study)? > > It might also be said that values quoted in latest CLEO paper are slightly > different from those ones quoted in PDG but they're all quite consistent > within the present errors, so I propose to stick to PDG errors/values... > > Let me know any doubt/question. > Cheers, > Alessio > > ______________________________________________________ > Alessio Sarti Universita' & I.N.F.N. Ferrara > tel +39-0532-974328 Ferrara > roma +39-06-49914338 > SLAC +001-650-926-2972 > > "... e a un Dio 'fatti il culo' non credere mai..." > (F. De Andre') > > "He was turning over in his mind an intresting new concept in > Thau-dimensional physics which unified time, space, magnetism, gravity > and, for some reason, broccoli". (T. Pratchett: "Pyramids") >