6 research outputs found
Measurement of B0 ---> D(*)+ D*- branching fractions and B0 ---> D*+(s) D*- polarization with a partial reconstruction technique
We present a study of the decays B0->D_s(*)+D*-, using 20.8 fb-1 of e+e-
annihilation data recorded with the BABAR detector. The analysis is conducted
with a partial reconstruction technique, in which only the D_s(*)+ and the soft
pion from the D*- decay are reconstructed. We measure the branching fractions
BR(B0->D_s+D*-) = (1.03 +/- 0.14 +/- 0.13 +/- 0.26)% and BR(B0->D_s*+D*-) =
(1.97 +/- 0.15 +/- 0.30 +/- 0.49)%, where the first error is statistical, the
second is systematic, and the third is the error due to the D_s+->phi pi+
branching fraction uncertainty. From the B0->D_s*+D*- angular distributions, we
measure the fraction of longitudinal polarization Gamma_L/Gamma = (51.9 +/- 5.0
+/- 2.8)%, which is consistent with theoretical predictions based on
factorization.Comment: 9 pages, 4 postscript figues, submitted to Physical Review D (Rapid
Communications
Measurement of the CKM matrix element |V(ub)| with B ---> rho e nu decays
We present a measurement of the branching fraction for the rare decays B->rho
e nu and extract a value for the magnitude of Vub, one of the smallest elements
of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix. The results are given for
five different calculations of form factors used to parametrize the hadronic
current in semileptonic decays. Using a sample of 55 million BBbar meson pairs
recorded with the BABAR detector at the PEP-II e+e- storage ring, we obtain
Br(B0->rho- e+ nu)=(3.29 +-0.42 +-0.47 +-0.60) x 10^-4 and |Vub|=(3.64 +-0.22
+-0.25 +0.39-0.56)x10^-3, where the uncertainties are statistical, systematic,
and theoretical, respectively.Comment: Submitted to Phys. Rev. Let
Measurement of the branching fraction for inclusive semileptonic B meson decays
A largely model-independent measurement of the inclusive electron momentum
spectrum and branching fraction for semileptonic decays of B mesons is
presented based on data recorded at the Upsilon(4S) resonance with the BABAR
detector. Backgrounds from secondary charm decays are separated from prompt B
decays using charge and angular correlations between the electron from one B
meson and a high momentum electron tag from the second B meson. The resulting
branching fraction is BR(B -> X e nu) = (10.87 +-0.18(stat)+-0.30(syst))%.
Based on this measurement we determine the CKM matrix element |V_cb|
Measurement of the branching fraction for inclusive semileptonic B meson decays
A largely model-independent measurement of the inclusive electron momentum
spectrum and branching fraction for semileptonic decays of B mesons is
presented based on data recorded at the Upsilon(4S) resonance with the BABAR
detector. Backgrounds from secondary charm decays are separated from prompt B
decays using charge and angular correlations between the electron from one B
meson and a high momentum electron tag from the second B meson. The resulting
branching fraction is BR(B -> X e nu) = (10.87 +-0.18(stat)+-0.30(syst))%.
Based on this measurement we determine the CKM matrix element |V_cb|