We report an observation of the decay B0(s) --> D(s)- pi++ in
p anti-p collisions at s**(1/2) = 1.96 TeV using 115 pb-1 of data collected by
the CDF II detector at the Fermilab Tevatron. We observe 83 +/- 11 B0(s) -->
D(s)- pi++ candidates, representing a large increase in statistics over
previous measurements and the first observation of this decay at a p anti-p
collider. We present the first measurement of this decay at a p anti-p
collider. We present the first measurement of the relative branching
fraction B(B0(s) --> D(s)- pi++)/B(B0 --> D- pi++) = 1.32 +/- 0.18(stat.)
+/- 0.38(syst.). We also measure B(B+ --> D-bar) pi++)/B(B0 --> D- pi++)
= 1.97 +/- 0.10(stat.) +/- 0.21(syst.), which is consistent with previous
measurements.
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Updated: Thursday, 2006 May 18 12:25:39 CDT automatically from input from Carol Picciolo