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Published November 1, 2009 | Published
Journal Article Open

Observation and polarization measurement of B^0 → a_1(1260)^(+)a_1(1260)^(-) decay


We present measurements of the branching fraction B and longitudinal polarization fraction f_L for B^0 → a_1(1260)^(+)a_1(1260)^(-) decays, with a_1(1260)^(±) → π^(-)π^(+)π^(±). The data sample, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represents 465 × 10^6 produced BB(overbar) pairs. We measure B(B^0 → a_1(1260)^(+)a_1(1260)^-) × [B(a_1(1260)^+ → π^(-)π^(+)π^(+))]^2 = (11.8±2.6±1.6) ×10^(-6) and f_L = 0.31±0.22±0.10, where the first uncertainty is statistical and the second systematic. The decay mode is measured with a significance of 5.0 standard deviations including systematic uncertainties.

Additional Information

© 2009 American Physical Society. Received 13 July 2009; published 20 November 2009. 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), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.

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Published - Aubert2009p10036Phys_Rev_D.pdf


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August 23, 2023
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