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Measurement of branching fractions of B decays to K_1(1270)π and K_1(1400)π and determination of the CKM angle α from B^0→a_1(1260)^±π^∓

Aubert, B. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Fang, F. and Hitlin, D. G. and Narsky, I. and Ongmongkolkul, P. and Piatenko, T. and Porter, F. C. (2010) Measurement of branching fractions of B decays to K_1(1270)π and K_1(1400)π and determination of the CKM angle α from B^0→a_1(1260)^±π^∓. Physical Review D, 81 (5). Art. No. 052009. ISSN 2470-0010. https://resolver.caltech.edu/CaltechAUTHORS:20100514-140503151

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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 454×10^6 BB̅ pairs produced in e^+e^- annihilation. We measure the branching fractions B(B^0→K_1(1270)^+π-+K_1(1400)^+π-)=3.1_(-0.7)^(+0.8)×10^(-5) and B(B^+→K_1(1270)^0π^++K_1(1400)^0π^+)=2.9_(-1.7)^(+2.9)×10^(-5) (<8.2×10^(-5) at 90% confidence level), where the errors are statistical and systematic combined. The B^0 decay mode is observed with a significance of 7.5σ, while a significance of 3.2σ is obtained for the B^+ decay mode. Based on these results, we estimate the weak phase α=(79±7±11)° from the time-dependent CP asymmetries in B^0→a1(1260)^±π^∓ decays.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.81.052009DOIArticle
http://link.aps.org/doi/10.1103/PhysRevD.81.052009PublisherArticle
Additional Information:© 2010 The American Physical Society. Received 14 September 2009; published 26 March 2010. We are indebted to Ian Aitchison for a number of helpful remarks 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 U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat a` l’Energie Atomique and Institut National de Physique Nucleaire et de Physique des Particules (France), the Bundesministerium fur 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 Educacion 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.
Funders:
Funding AgencyGrant Number
Department of EnergyUNSPECIFIED
NSFUNSPECIFIED
Natural Sciences and Engineering Research Council (Canada)UNSPECIFIED
Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany)UNSPECIFIED
Commissariat à l’Energie AtomiqueUNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (France) UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (Italy)UNSPECIFIED
Foundation for Fundamental Research on Matter (The Netherlands)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Education and Science of the Russian FederationUNSPECIFIED
Ministerio de Educaciόn y Ciencia (Spain)UNSPECIFIED
Science and Technology Facilities Council (United Kingdom)UNSPECIFIED
Marie-Curie IEF program (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Issue or Number:5
Classification Code: PACS: 13.25.Hw, 11.30.Er, 12.15.Hh
Record Number:CaltechAUTHORS:20100514-140503151
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100514-140503151
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18312
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 May 2010 19:42
Last Modified:03 Oct 2019 01:41

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