Measurement of time-dependent $CP$ violation in $B^0 \to K^0_S \pi^0 \pi^0$ decays.

Y. Yusa,H. Aihara,S. Al Said,D. M. Asner,H. Atmacan,V. Aulchenko,T. Aushev,R. Ayad,V. Babu,I. Badhrees, S. Bahinipati,A. M. Bakich,V. Bansal, P. K. Behera,V. Bhardwaj,B. Bhuyan,J. Biswal, A. Bozek,M. Bračko,T. E. Browder, L. Cao,D. Červenkov, V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,S.-K. Choi,Y. Choi,D. Cinabro,S. Cunliffe,N. Dash,S. Di Carlo, T. V. Dong, Z. Drásal,S. Eidelman,D. Epifanov,J. Fast,B. G. Fulsom,Rocky Bala Garg,V. Gaur,A. Giri, P. Goldenzweig,B. Golob, Y. Guan,J. Haba,K. Hayasaka,H. Hayashii, S. Hirose, K. Inami, G. Inguglia,A. Ishikawa,M. Iwasaki, Y. Iwasaki,W. W. Jacobs, S. Jia, Y. Jin, K. K. Joo,K. H. Kang,T. Kawasaki,D. Y. Kim,J. B. Kim,K. T. Kim, S. H. Kim,K. Kinoshita, P. Kodys,S. Korpar, D. Kotchetkov,P. Križan,R. Kroeger,T. Kuhr,R. Kumar, Y. Kwon, J. S. Lange, I. S. Lee,Songkyo Lee,L. Li,Yongmin Li,L. Li Gioi, J. Libby, D. Liventsev,M. Lubej,T. Luo,M. Masuda,T. Matsuda,M. Merola, K. Miyabayashi,H. Miyata,R. Mizuk,G. B. Mohanty,H. K. Moon, E. Nakano,T. Nanut, K. J. Nath,Z. Natkaniec,N. K. Nisar,S. Nishida,K. Nishimura,K. Ogawa,S. Ogawa,H. Ono,G. Pakhlova,B. K. Pal, S. Pardi, H. Park,S. Paul,T. K. Pedlar, R. Pestotnik,L. E. Piilonen,Vladimir Popov, E. Prencipe,A. Rostomyan,G. Russo, Y. Sakai,S. Sandilya, T. Sanuki, V. Savinov,O. Schneider, G. Schnell, C. Schwanda,A. J. Schwartz, Y. Seino,K. Senyo,O. Seon,M. E. Sevior, C. P. Shen,T.-A. Shibata,J. G. Shiu, M. Starič, M. Sumihama, T. Sumiyoshi,M. Takizawa,U. Tamponi,K. Tanida, F. Tenchini,M. Uchida,T. Uglov, Y. Unno,S. Uno,Y. Ushiroda,Y. Usov,C. Van Hulse,R. Van Tonder, G. Varner,K. E. Varvell,V. Vorobyev,A. Vossen,E. Waheed,Bingran Wang,C. H. Wang, M. Wang, P. Wang,E. Won,H. Ye,J.H. Yin, Z. P. Zhang,V. Zhilich,V. Zhulanov

PHYSICAL REVIEW D（2019）

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摘要

We report a measurement of time-dependent CP violation in B-0 -> K-S(0)pi(0)pi(0) decays using a data sample of 772 x 10(6) B (B) over bar pairs collected by the Belle experiment running at the (sic)(4S) resonance at the KEKB e(+)e(-) collider. This decay proceeds mainly via a b -> sd (d) triple over dot "penguin" amplitude. The results are sin 2 phi(eff)(1) = 0.92(-0.31)(+0.27) (stat.) +/- 0.11 (syst.) and A = 0.28 +/- 0.21 (stat.) +/- 0.04 (syst.), which are the most precise measurements of CP violation in this decay mode to date. The value for the CP-violating parameter sin 2 phi(eff)(1) is consistent with that obtained using decay modes proceeding via a b -> c (c) over bars "tree" amplitude.

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