Measurements of the branching fraction, polarization, and CP asymmetry
for the decay B^0→ωω
Belle Collaboration,Y. Guan,A. J. Schwartz,K. Kinoshita,I. Adachi,H. Aihara,S. Al Said,D. M. Asner,H. Atmacan,R. Ayad,S. Bahinipati,Sw. Banerjee,K. Belous,J. Bennett,M. Bessner,V. Bhardwaj,B. Bhuyan,D. Biswas,A. Bobrov,D. Bodrov,J. Borah,A. Bozek,M. Bračko,P. Branchini,A. Budano,M. Campajola,L. Cao,D. Červenkov,M. -C. Chang,P. Chang,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -K. Choi,Y. Choi,S. Choudhury,S. Das,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong,S. Dubey,P. Ecker,D. Epifanov,T. Ferber,D. Ferlewicz,B. G. Fulsom,V. Gaur,A. Giri,P. Goldenzweig,E. Graziani,T. Gu,K. Gudkova,C. Hadjivasiliou,K. Hayasaka,H. Hayashii,S. Hazra,M. T. Hedges,W. -S. Hou,C. -L. Hsu,N. Ipsita,A. Ishikawa,R. Itoh,M. Iwasaki,W. W. Jacobs,S. Jia,Y. Jin,K. K. Joo,T. Kawasaki,C. H. Kim,D. Y. Kim,K. -H. Kim,Y. J. Kim,Y. -K. Kim,P. Kodyš,A. Korobov,S. Korpar,E. Kovalenko,P. Križan,P. Krokovny,T. Kuhr,R. Kumar,K. Kumara,T. Kumita,Y. -J. Kwon,Y. -T. Lai,S. C. Lee,D. Levit,L. K. Li,Y. Li,Y. B. Li,L. Li Gioi,J. Libby,D. Liventsev,T. Luo,M. Masuda,T. Matsuda,S. K. Maurya,F. Meier,M. Merola,F. Metzner,K. Miyabayashi,R. Mizuk,G. B. Mohanty,R. Mussa,I. Nakamura,M. Nakao,Z. Natkaniec,A. Natochii,L. Nayak,M. Nayak,M. Niiyama,S. Nishida,S. Ogawa,H. Ono,G. Pakhlova,S. Pardi,H. Park,J. Park,S. -H. Park,S. Paul,R. Pestotnik,L. E. Piilonen,T. Podobnik,E. Prencipe,M. T. Prim,M. Röhrken,G. Russo,S. Sandilya,L. Santelj,V. Savinov,G. Schnell,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,W. Shan,J. -G. Shiu,E. Solovieva,M. Starič,K. Sumisawa,M. Takizawa,U. Tamponi,K. Tanida,F. Tenchini,R. Tiwary,K. Trabelsi,M. Uchida,Y. Unno,S. Uno,P. Urquijo,Y. Usov,S. E. Vahsen,K. E. Varvell,A. Vinokurova,M. -Z. Wang,S. Watanuki,E. Won,X. Xu,B. D. Yabsley,W. Yan,Y. Yook,L. Yuan,Z. P. Zhang,V. Zhilich,V. Zhukova
arxiv（2024）
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摘要
We present a measurement of B^0→ωω, a charmless
decay into two vector mesons, using 772 × 10^6 BB pairs
collected with the Belle detector at the KEKB e^+e^- collider. The decay is
observed with a significance of 7.9 standard deviations. We measure a branching
fraction ℬ = (1.53 ± 0.29 ± 0.17) × 10^-6, a fraction of
longitudinal polarization f_L = 0.87 ± 0.13 ± 0.13, and a time-integrated
CP asymmetry A_CP = -0.44 ± 0.43 ± 0.11, where the first
uncertainties listed are statistical and the second are systematic. This is the
first observation of B^0→ωω, and the first
measurements of f_L and A_CP for this decay.
