Abstract
We report measurements of the branching fractions of neutral and charged B meson decays to final states containing a K-1(1270) or K-1(1400) meson and a charged pion. The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, correspond to 454 x 10(6) B (B) over bar pairs produced in e(+)e(-) annihilation. We measure the branching fractions B(B-0 -> K-1(1270)(+)pi(-) + K-1(1400)(+)pi(-)) = 3.1(-0.7)(+0.8) x 10(-5) and B(B+ -> K-1(1270)(0)pi(+) + K1(1400)(0)pi(+)) = 2.9(-1.7)(+2.9) x 10(-5) (< 8.2 x 10(-5) at 90% confidence level), where the errors are statistical and systematic combined. The B-0 decay mode is observed with a significance of 7.5 sigma, while a significance of 3.2 sigma is obtained for the B+ decay mode. Based on these results, we estimate the weak phase alpha = (79 +/- 7 +/- 11)degrees from the time-dependent CP asymmetries in B-0 -> a(1)(1260)(+/-)pi(-/+) decays.
We thank Ian Aitchison for helpful discussions and
suggestions. We are grateful for the extraordinary contributions
of our PEP-II colleagues in achieving the
excellent luminosity and machine conditions that have
made this work possible. The success of this project
also relies critically on the expertise and dedication of
the computing organizations that support BABAR. The
collaborating institutions wish to thank SLAC for its
support and the kind hospitality extended to them.
This work is supported by the US Department of Energy
and National Science Foundation, the Natural Sciences
and Engineering Research Council (Canada), the
Commissariat à l'Energie Atomique and Institut National
de Physique Nucléaire et de Physique des Particules
(France), the Bundesministerium für Bildung und
Forschung and Deutsche Forschungsgemeinschaft (Germany),
the Istituto Nazionale di Fisica Nucleare (Italy),
the Foundation for Fundamental Research on Matter
(The Netherlands), the Research Council of Norway, the
Ministry of Education and Science of the Russian Federation,
Ministerio de Educación y Ciencia (Spain), and
the Science and Technology Facilities Council (United
Kingdom). Individuals have received support from the
Marie-Curie IEF program (European Union) and the A.
P. Sloan Foundation.
Peer reviewed