Measurement of CP asymmetries and branching fractions in a time-dependent Dalitz analysis of B^{0}→(ρπ)^{0} and a constraint on the quark mixing angle ϕ_{2}

A. Kusaka,C. C. Wang,I. Adachi,H. Aihara,K. Arinstein,V. Aulchenko,T. Aushev,A. M. Bakich,V. Balagura, E. Barberio,I. Bedny,K. Belous,U. Bitenc,A. Bondar,A. Bozek,M. Bračko,T. E. Browder,P. Chang, Y. Chao,A. Chen,W. T. Chen,B. G. Cheon,R. Chistov,I.-S. Cho,S.-K. Choi,Y. Choi,J. Dalseno,M. Dash, S. Eidelman,N. Gabyshev,B. Golob,J. Haba, K. Hara, K. Hayasaka, H. Hayashii,M. Hazumi,D. Heffernan,Y. Hoshi,W.-S. Hou,H. J. Hyun, T. Iijima,K. Inami,A. Ishikawa,H. Ishino,R. Itoh,M. Iwasaki, Y. Iwasaki,D. H. Kah,J. H. Kang, H. Kawai,T. Kawasaki,H. Kichimi,H. O. Kim,S. K. Kim,Y. J. Kim,K. Kinoshita,S. Korpar,P. Križan,P. Krokovny,R. Kumar,C. C. Kuo,A. Kuzmin,Y.-J. Kwon, J. S. Lee,M. J. Lee,S. E. Lee,T. Lesiak, A. Limosani,S.-W. Lin,Y. Liu,D. Liventsev,F. Mandl,A. Matyja,S. McOnie, T. Medvedeva, K. Miyabayashi,H. Miyake,H. Miyata,Y. Miyazaki,R. Mizuk,G. R. Moloney,E. Nakano, M. Nakao, S. Nishida,O. Nitoh,S. Noguchi,T. Nozaki, S. Ogawa,T. Ohshima, S. Okuno,H. Ozaki,G. Pakhlova,C. W. Park, H. Park,L. S. Peak,R. Pestotnik,L. E. Piilonen,H. Sahoo, Y. Sakai, O. Schneider,C. Schwanda,A. J. Schwartz,K. Senyo,M. E. Sevior,M. Shapkin, C. P. Shen,H. Shibuya,B. Shwartz,J. B. Singh,A. Somov,S. Stanič,M. Starič,T. Sumiyoshi,S. Suzuki,S. Y. Suzuki,F. Takasaki,K. Tamai,N. Tamura, M. Tanaka,Y. Teramoto,I. Tikhomirov,K. Trabelsi, S. Uehara,K. Ueno,T. Uglov, Y. Unno,S. Uno, P. Urquijo, G. Varner,K. E. Varvell,K. Vervink,S. Villa,C. H. Wang,M.-Z. Wang,P. Wang,X. L. Wang, Y. Watanabe,E. Won, Y. Yamashita,Z. P. Zhang, V. Zhulanov, A. Zupanc,O. Zyukova

PHYSICAL REVIEW D（2008）

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Abstract

We present the results of a time-dependent Dalitz plot analysis of B-0 ->pi(+)pi(-)pi(0) decays based on a 414 fb(-1) data sample that contains 449x10(6)B (B) over bar pairs. The data were collected on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. Combining our analysis with information on charged B decay modes, we perform a full Dalitz and isospin analysis and obtain a constraint on the quark mixing angle phi(2), 68 degrees rho(+/-)(770)pi(-/+) and B-0 ->rho(0)(770)pi(0) are measured to be (22.6 +/- 1.1[stat]+/- 4.4[syst])x10(-6) and (3.0 +/- 0.5[stat]+/- 0.7[syst])x10(-6), respectively. These are the first branching fraction measurements of the process B-0 ->rho(770)pi with the lowest resonance rho(770) explicitly separated from the radial excitations.

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Key words

confidence level,elementary particles,standard model,linear accelerator

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