Study Of B-0 -> Rho(0)Rho(0) Decays, Implications For The Ckm Angle Phi(2) And Search For Other B-0 Decay Modes With A Four-Pion Final State

P Vanhoefer,J Dalseno,C Kiesling,I Adachi,H Aihara,D M Asner,V Aulchenko,T Aushev,A M Bakich,A Bala,V Bhardwaj,B Bhuyan,G Bonvicini, A Bozek, M Bracko,T E Browder,M C Chang,P Chang,V Chekelian,Aizheng Chen,P Chen,B G Cheon,K Chilikin,R Chistov,K Cho,V Chobanova,Y Choi,D Cinabro,Z Dolezal,Z Drasal,S Eidelman,H Farhat,J Fast, T Ferber,V Gaur,N Gabyshev,S Ganguly,A Garmash,R Gillard,Y M Goh,B Golob,Tetsuya Hara,K Hayasaka, H Hayashii,Takahiro Higuchi,Y Horii,Y Hoshi,W S Hou, H J Hyun, T Iijima,A Ishikawa,R Itoh, Yoshiko Iwasaki,T Iwashita,I Jaegle,T Julius,D H Kah,E Kato,Hisashi Kawai,T Kawasaki,Dae Yong Kim,H O Kim,J H Kim,M J Kim,Yoon Jung Kim,K Kinoshita,J Klucar,B R Ko,S Korpar,P Krizan,P Krokovny,B Kronenbitter,T Kuhr,T Kumita,A Kuzmin,Y J Kwon,J S Lange,S H Lee,Jianrong Li,L Li Gioi,J Libby,C Liu,Yue Liu,D Liventsev,P Lukin,K Miyabayashi,H Miyata,R Mizuk,G B Mohanty,A Moll,H G Moser,R Mussa,E Nakano,M Nakao,Z Natkaniec,E Nedelkovska,N K Nisar,S Nishida,O Nitoh,S Ogawa,P Pakhlov,G Pakhlova,C W Park,H K Park, T K Pedlar, R Pestotnik, M Petric, L E Piilonen,M Ritter, M Roehrken, A Rostomyan,S Ryu,H Sahoo, Toru Saito,Y Sakai,S Sandilya, L Santelj,T Sanuki,Yasuo Sato, V Savinov,O Schneider, G Schnell, C Schwanda,A J Schwartz,D Semmler,K Senyo,O Seon,M E Sevior,M Shapkin, C P Shen,T A Shibata,J G Shiu,B Shwartz,A Sibidanov,F Simon, Y S Sohn,A Sokolov,E Solovieva, M Staric, M Steder,T Sumiyoshi,U Tamponi,G Tatishvili,Y Teramoto,K Trabelsi,T Tsuboyama,M Uchida,S Uehara, Y Unno,S Uno,S Vahsen,C Van Hulse, G Varner,K E Varvell, A Vinokurova,V Vorobyev, M N Wagner,C H Wang,M Z Wang, P Wang,X L Wang, Y Watanabe,K M Williams,E Won,Yuichi Yamashita, S Yashchenko, Y Yook, Z P Zhang,V Zhilich,V Zhulanov, A Zupanc

PHYSICAL REVIEW D（2014）

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摘要

We present a study of the branching fraction of the decay B-0 -> rho(0)rho(0) and the fraction of longitudinally polarized rho(0) mesons in this decay. 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 find 166 +/- 59 B-0 -> rho(0)rho(0) events (including systematic uncertainties), corresponding to a branching fraction of B(B-0 -> rho(0)rho(0)) = (1.02 +/- 0.30(stat) +/- 0.15(syst)) x 10(-6) with a significance of 3.4 standard deviations and a longitudinal polarization fraction f(L) = 0.21(-0.22)(+0.18()stat) +/- 0.15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle phi(2) = (84.9 +/- 13.5)degrees through an isospin analysis in the B ->rho rho system. We furthermore find 125 +/- 41 B-0 -> f(0)rho(0) events, corresponding to B(B-0 -> f(0)rho(0)) x B(f(0) -> pi(+)pi(-)) = (0.78 +/- 0.22(stat) +/- 0.11(syst)) x 10(-6), with a significance of 3.1 standard deviations. We find no other significant contribution with the same final state, and set upper limits at 90% confidence level on the (product) branching fractions, B(B-0 -> pi(+)pi(-)pi(+)pi(-)) < 11.2 x 10(-6), B(B-0 -> rho(0)pi(+)pi(-)) < 12.0 x 10(-6), B(B-0 -> f(0)pi(+)pi(-)) x B(f(0) -> pi(+)pi(-)) < 3.0 x 10(-6) and B(B-0 -> f(0)f(0)) x B(f(0) -> pi(+)pi(-))(2) < 0.2 x 10(-6).

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