Hi all,
as discussed at the meeting I performed the systematics due to the
exclusive b->ulnu BRs varying separately the pilnu and the rholnu
contributions instead of varying all the exclusive components of the same
relative amount.
These are the results:
test BRBR
BR(B0->pi+lnu) +30% && BR(B+->pi0lnu) +30% - 1.7%
BR(B0->pi+lnu) -30% && BR(B+->pi0lnu) -30% + 2.0%
BR(B0->rho+lnu) +30% && BR(B+->rho0,omegalnu) +30% - 0.5%
BR(B0->rho+lnu) -30% && BR(B+->rho0,omegalnu) -30% + 0.8%
BR(B->pilnu) +30% && BR(B->rholnu) +30% - 2.5%
BR(B->pilnu) -30% && BR(B->rholnu) -30% - 2.8%
as a crosscheck I tried to remove all the remaining exclusive compenent
(not yet observed decay modes)
BR(B->Xlnu (not pi and rho) -100% - 5.8%
and it seems to go in the opposite direction but explanes why the
hybrid and the non resonant model give then similar results (something
like a compensation). Quoting this difference as systematics probably
would be too conservative since it implies that we don't use at the
theoretical information about eta, eta' , a1, b1 , f1 lnu decays.
I propose to quote a simmetric syst uncertainty of 2.6%. Together with
the systematics due to the fit using the pure non resonant model it gives
us a systematics of ~4% that would be conservative.
Daniele
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