Journal article
Measurement of the CP violation parameters in B0→π π- decays
J Dalseno, K Prothmann, C Kiesling, I Adachi, H Aihara, K Arinstein, DM Asner, V Aulchenko, T Aushev, AM Bakich, A Bala, A Bay, P Behera, V Bhardwaj, B Bhuyan, A Bondar, G Bonvicini, A Bozek, M Bračko, TE Browder Show all
Physical Review D Particles Fields Gravitation and Cosmology | Published : 2013
Abstract
We present a measurement of the charge-parity (CP) violating parameters in B0→π+π- decays. The results are obtained from the final data sample containing 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the CP violation parameters ACP(B0→π+π-)=+0.33±0.06(stat)±0.03(syst),SCP(B0→π+π-)=-0.64±0.08(stat)±0.03(syst),where ACP and SCP represent the direct and mixing-induced CP asymmetries in B0→π+π- decays, respectively. Using an isospin analysis including results from other Belle measurements, we find 23.8 <φ2<66.8 is disfavored at the 1σ level, where φ2 is one of the three interior angles of the Cabibbo-Kobayashi-Ma..
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Awarded by Japan Society for the Promotion of Science
Funding Acknowledgements
We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group, the National Institute of Informatics, and the PNNL/EMSL computing group for valuable computing and SINET4 network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council and the Australian Department of Industry, Innovation, Science and Research; Austrian Science Fund under Grant No. P 22742-N16; the National Natural Science Foundation of China under Contracts No. 10575109, No. 10775142, No. 10875115 and No. 10825524; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. MSM0021620859; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft and the VolkswagenStiftung; the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; the BK21 and WCU program of the Ministry of Education, Science and Technology; the National Research Foundation of Korea Grants No. 20100021174, No. 2011-0029457, No. 2012-0008143, No. 2012R1A1A2008330; the BRL program under NRF Grant No. KRF-2011-0020333; the GSDC of the Korea Institute of Science and Technology Information; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Education and Science of the Russian Federation and the Russian Federal Agency for Atomic Energy; the Slovenian Research Agency; the Basque Foundation for Science (IKERBASQUE) and the UPV/EHU under program UFI 11/55; the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the U.S. Department of Energy and the National Science Foundation. This work is supported by a Grant-in-Aid from MEXT for Science Research in a Priority Area ("New Development of Flavor Physics'') and from JSPS for Creative Scientific Research ("Evolution of Tau-lepton Physics'').