Journal
PHYSICAL REVIEW D
Volume 86, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.86.092012
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
- Japan Society for the Promotion of Science (JSPS)
- Tau-Lepton Physics Research Center of Nagoya University
- Australian Research Council
- Australian Department of Industry, Innovation, Science and Research
- National Natural Science Foundation of China [10575109, 10775142, 10875115, 10825524]
- Ministry of Education, Youth and Sports of the Czech Republic [LA10033, MSM0021620859]
- Department of Science and Technology of India
- Istituto Nazionale di Fisica Nucleare of Italy
- BK21 program of the Ministry Education Science and Technology
- WCU program of the Ministry Education Science and Technology
- National Research Foundation of Korea
- GSDC of the Korea Institute of Science and Technology Information
- Polish Ministry of Science and Higher Education
- Ministry of Education and Science of the Russian Federation
- Russian Federal Agency for Atomic Energy
- Slovenian Research Agency
- Swiss National Science Foundation
- National Science Council
- Ministry of Education of Taiwan
- U.S. Department of Energy
- National Science Foundation
- MEXT
- JSPS
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We present a measurement of the branching fraction and time-dependent CP violation parameters in B-0 -> a(1)(+/-)(1260)pi(-/+) decays. The results are obtained from the final data sample containing 772 x 10(6) B (B) over bar pairs collected at the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain the product branching fraction B(B-0 -> a(1)(+/-)(1260)pi(-/+)) x B(a(1)(+/-)(1260) -> pi(+/-)pi(-/+)pi(+/-)) = (11.1 +/- 1.0(stat) +/- 1.4(syst)) x 10(-6) and an upper limit on the product branching fraction for a possible decay with the same final state B(B-0 -> a(2)(+/-)(1320)pi(-/+)) x B(a(2)(+/-)(1320) -> pi(+/-)pi(-/+)pi(+/-)) <2.2x10(-6) at 90% CL. In a time-dependent measurement to extract CP asymmetries, we obtain the CP violation parameters A(CP) = -0.06 x 0.05(stat) +/- 0.07(syst), C-CP = -0.01 +/- 0.11(stat) +/- 0.09(syst), S-CP = -0.51 +/- 0.14(stat) +/- 0.08(syst), representing time-and flavor-integrated direct, flavor-dependent direct and mixing-induced CP violation, respectively. Simultaneously, we also extract the CP-conserving parameters Delta C = +0.54 +/- 0.11(stat) +/- 0.07(syst), Delta S = -0.09 +/- 0.14(stat) +/- 0.06(syst), which, respectively, describe a rate difference and strong phase difference between the decay channels where the a(1)(+/-) does not contain the spectator quark and those where it does. We find first evidence of mixing-induced CP violation in B-0 -> a(1)(+/-)(1260)pi(-/+) decays with 3.1 sigma significance. The rate where the a(1)(+/-) 1 does not contain the spectator quark from the B meson is found to dominate the rate where it does at the 4.1 sigma level. However, there is no evidence for either time-and flavor-integrated direct CP violation or flavor-dependent direct CP violation.
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