Aubert, B. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Fang, F. and Hitlin, D. G. and Narsky, I. and Piatenko, T. and Porter, F. C. (2008) Measurement of the branching fraction, polarization, and CP asymmetries in B^0 → ρ^0ρ^0 decay, and implications for the CKM angle α. Physical Review D, 78 (7). Art. No. 071104. ISSN 2470-0010. doi:10.1103/PhysRevD.78.071104. https://resolver.caltech.edu/CaltechAUTHORS:20100623-073557014
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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.
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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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Issue or Number: | 7 | ||||||||||||||||||||||||||||||||||
Classification Code: | PACS: 13.25.Hw, 11.30.Er, 12.15.Hh | ||||||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevD.78.071104 | ||||||||||||||||||||||||||||||||||
Record Number: | CaltechAUTHORS:20100623-073557014 | ||||||||||||||||||||||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20100623-073557014 | ||||||||||||||||||||||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||||||||||
ID Code: | 18769 | ||||||||||||||||||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||||||||
Deposited By: | Ruth Sustaita | ||||||||||||||||||||||||||||||||||
Deposited On: | 23 Jun 2010 20:44 | ||||||||||||||||||||||||||||||||||
Last Modified: | 08 Nov 2021 23:46 |
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