2010/12/14 Niels Tuning <h71@nikhef.nl>

Hi friends,

For your information, Robert, Nicola and me had a closer
(phenomenological) look into the ratios of B->Dh decays, in the light of

the determination of fs/fd.

In case you are interested, we just submitted a preprint describing our
findings: http://arxiv.org/abs/1012.2784

In summary, we have reached the following conclusions:
1) If we use the ratio N(B0->D-K+)/N(Bs->Ds-pi+) to determine fs/fd we

argue that the uncertainty from SU(3) breaking of factorization is 2%.
2) We propose that we can also use the Cabibbo favoured decay, ie.
N(B0->D-pi+)/N(Bs->Ds-pi+), for the determination of fs/fd. The price
to pay is that the theoretical uncertainty is a bit larger due to the
extra ("exchange") diagram in B0->D-pi+.

Cheers, Robert, Nicola & Niels

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