Hi all,
we have some more questions on some of the systematics. We will appreciate
answers to any of them.
> In the BAD we do the following
>
> Evaluate B->semilep sys (using ONLY -b flag when submitting fit and Sys >
> 0)
> Evaluate D->Excl sys (using only -d flag when submitting fit and Sys
> >=2)
> Evaluate D->Incl sys (using only -d flag when submitting fit and Sys
> =1)
>
> And then we merge the B->semilep sys with the higher contribution from
> D->Excl or D->Incl .
* What is meant by "merge"?
a) Combine the results for the errors for the B->semilep sys with D->Excl
sys and also the results for the errors for the B->semilep sys with
D->Incl sys and then look at these two combinations and consider them
as the error (obtained in two ways, excl and incl for the D->
sys)(Thus merging the results.)
b) Redo the procedure and evaluate the error for B->semilep sys and
D->Excl sys together and then evaluate the error on B->semilep sys and
D->Incl sys together (rather than just merging the results). (Thus
merging the procedure. If this, what is taken as the error in the
end, the errors obtained separately for B and D or the error
obtained from the "merged procedure" or denepnding on the results?)
c) Something else?
We would like to understand why you have an inclusive and an exclusive
procedure for the D-> sys. Is this to take into account possible
correlations between the different D branching fractions?
* Theory error
- Is there any consensus how this should be done?
- Concerning how you did it as it is in the BAD: It looks like you
varied a and mb independently for the fits, but took a delta mb = 150
MeV rather than 90 MeV to account for the correlations. Did it
understand that correctly?
* b->u fractions
Which values and errors are you using for the reweighting of the B->
pi/rho l nu? When you do this, do you reweight the other b->u decays as
well to have constant b->u branching ratio?
Which values are used for the inclusive b->u branching ratio variation?
Could you give me a hint where in the code this was done? So far I could
not find anything related to that.
* ssbar popping
How (and where?) are you varying the ssbar popping events?
Thanks for helping,
Kerstin
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