Hi all,

 this is the effect of removing ssbar popping events from our signal model

 Default
 BRBR = 0.0202685 +- 0.00250473(stat) +- 0.00106675(MC stat)

 No ssbar events in signal
 BRBR = 0.0186895 +- 0.00230994(stat) +- 0.000980661(MC stat)

 that implies a difference of 7.7% mostly due to the change on the Eps_u
efficiency.


 Now the question is: do we want to keep the full variation of 7.7% as
systematic effect?

 With this additional error we will have:

 - error(model b->u)          6% -> 9.7%
 - tot exp error              11.4% -> 13.7%
 - tot error                  20.8% -> 22.2%


 Daniele

On Wed, 19 Mar 2003, Urs Langenegger wrote:

>
> Hoi,
>
> in  ~ursl/root/anaQA-o00/.   you can  find  the  usual  set of  merged
> rootfiles containing the "wKK" member in the "events" tree.  Feel free
> to start  implementing something  in the fit  to reweight  events with
> ssbar in  the Xu  system (events with  KKbar in  the Xu have  wKK ==1,
> those without have wKK == 0).
>
> The default fit  on these files gives BRBR =  0.0202685, which is 2.5%
> above  the iteration with  n00.  Offhand,  I don't  know why  it's not
> identical.  I  will be  running another identical  batch after  the KL
> systematics batch is done.
>
> Cheers,
> --U.
>
>