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Published March 27, 2012 | Published
Journal Article Open

Amplitude analysis and measurement of the time-dependent CP asymmetry of B^0 → K^0_SK^0_SK^0_S decays


We present the first results on the Dalitz-plot structure and improved measurements of the time-dependent CP-violation parameters of the process B^0→K_S^0K_S^0K_S^0 obtained using 468×10^6  BB̅ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. The Dalitz-plot structure is probed by a time-integrated amplitude analysis that does not distinguish between B^0 and B̅^0 decays. We measure the total inclusive branching fraction B(B^0→K_S^0K_S^0K_S^0)=(6.19±0.48±0.15±0.12)×10^(-6), where the first uncertainty is statistical, the second is systematic, and the third represents the Dalitz-plot signal model dependence. We also observe evidence for the intermediate resonant states f_0(980), f_0(1710), and f_2(2010). Their respective product branching fractions are measured to be (2.70_(-1.19)^(+1.25)±0.36±1.17)×10^(-6), (0.50_(-0.24_^(+0.46)±0.04±0.10)×10^(-6), and (0.54_(-0.20)^(+0.21)±0.03±0.52)×10^(-6). Additionally, we determine the mixing-induced CP-violation parameters to be S=-0.94_(-0.21)^(+0.24)±0.06 and C=-0.17±0.18±0.04, where the first uncertainty is statistical and the second is systematic. These values are in agreement with the standard model expectation. For the first time, we report evidence of CP violation in B^0→K_S^0K_S^0K_S^0 decays; CP conservation is excluded at 3.8 standard deviations including systematic uncertainties.

Additional Information

© 2012 American Physical Society. Received 16 November 2011; published 27 March 2012. 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 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 Ciencia e Innovaciόn (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).

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