> I am looking in recoilDsys.cc at
>
> TRandom rndm(seed);
> float xv0[6]={10.2,2.10,4.68,0.,0.63,0.23}; // existing measurements (order: all semilep, D,D*,nothing,D1*,D2*)
> float xt0[6]={11.3,2.10,5.60,9.,0.56,0.37};// values from decay.dec
> float xe0[6]={0.4,0.19,0.22,0.,0.10,0.08}; // errors on existing measurements
>
> from the HEAD of IBU. I think that these hard-coded numbers should
> tell about B0 decays (compared to the tables in files which contain
> the D decay numbers), right?
>
> Can someone please explain these numbers? In particular, I am puzzled
> about the following:
>
> o How do we get 11.3 from decay.dec? I checked and that should be 10.4
> and it is (if you sum it up, e.g. in release 10.3.1a). The existing
> measurements for the sl BR B->Xc l nu is 10.42, not 10.2 (PDG)
Hi,
the number quoted (11.3) comes from the generator level study made from
Ric months ago (if I do remember well): I remember that there were some
discrepancies (discussed in a MC session on generator parameters) btw the
values quoted in DECAY.DEC and the values found with jobs at generator
level.
I do not know how hard would be to rerun the study at generator level and
revalidate the numbers.....
>
> o I would propose to change 4.68 to 5.4\pm 0.22 since that is the
> latest and greatest average from the old LEP-HF working group ([not]
> shown in Amsterdam, but implicit in the Vcb's shown there). This is
> most probably going to be the new PDG value for the 2003 web update.
I agree on that :) but, as Ric, I remember that in the past the
contribution from semileptonic systematics has never helped on B0
buisness.
Ciao,
Alessio
>
>
> Cheers,
> --U.
>
