CaltechAUTHORS
Published October 2008 | Version Published
Journal Article Open

Measurement of the branching fraction, polarization, and CP asymmetries in B^0 → ρ^0ρ^0 decay, and implications for the CKM angle α

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Abstract

We study B^0→ρ^0ρ^0 decays in a sample of 465×10^6 Υ(4S)→BB events collected with the BABAR detector at the PEP-II asymmetric-energy e^+e^- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B=(0.92±0.32±0.14)×10^(-6) and longitudinal polarization fraction f_L=0.75_(-0.14)^(+0.11)±0.05, where the first uncertainty is statistical and the second is systematic. The evidence for the B^0→ρ^0ρ^0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S_L^(00)=(0.3±0.7±0.2) and C_L^(00)=(0.2±0.8±0.3). We study the implication of these results for the unitarity triangle angle α.

Additional Information

© 2008 The American Physical Society. Received 30 July 2008; published 23 October 2008. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MIST (Russia), MEC (Spain), and PPARC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.

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Identifiers

Eprint ID
18769
Resolver ID
CaltechAUTHORS:20100623-073557014

Funding

Department of Energy
NSF
Natural Sciences and Engineering Research Council (Canada)
Institute of High Energy Physics (China)
Commissariat à l'Énergie Atomique (French Atomic Energy Commission)
Centre National de la Recherche Scientifique (National Center for Scientific Research, France) Institut National de Physique Nucléaire et Physique des Particules (France)
Bundesministerium für Bildung und Forschung (German: Federal Ministry of Education and Research; Bonn, Germany)
Deutsche Forschungsgemeinschaft (German Research Council)
Istituto Nazionale di Fisica Nucleare, Italy
Foundation for Fundamental Research on Matter (The Netherlands)
Research Council of Norway
MIST (Russia)
Ministerio de Educación y Ciencia (Spain: Ministry for Education and Science)
Particle Physics and Astronomy Research Council (UK)
Marie Curie EIF (European Union)
A. P. Sloan Foundation

Dates

Created
2010-06-23
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Updated
2021-11-08
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