Measurement of time-dependent CP violation in B0→KS0π0π0 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. 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. E. Fast,B. G. Fulsom,R. Garg,V. Gaur, A. Garmash,A. Giri, P. Goldenzweig,B. Golob, Y. Guan,J. Haba,K. Hayasaka,H. Hayashii, S. Hirose, K. Inami, G. Inguglia,A. Ishikawa, R. Itoh,M. Iwasaki, Y. Iwasaki,W. W. Jacobs, S. Jia, Y. Jin, K. K. Joo,K. H. Kang,T. Kawasaki, C. Kiesling,D. Y. Kim,J. B. Kim,K. T. Kim,S. H. Kim,K. Kinoshita, P. Kodyš,S. Korpar, D. Kotchetkov, P. Križan,R. Kroeger,T. Kuhr,R. Kumar,Y.-J. Kwon, J. S. Lange,I. S. Lee,S. C. Lee,L. K. Li, Y. B. 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, M. Nakao,T. Nanut, K. J. Nath,Z. Natkaniec,N. K. Nisar,S. Nishida,K. Nishimura,K. Ogawa,S. Ogawa,H. Ono, G. Pakhlova, B. Pal, S. Pardi, H. Park,S. Paul,T. K. Pedlar, R. Pestotnik,L. E. Piilonen,V. 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,B. Wang,C. H. Wang, M.-Z. 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 B0→KS0π0π0 decays using a data sample of 772×106  BB¯ pairs collected by the Belle experiment running at the ϒ(4S) resonance at the KEKB e+e- collider. This decay proceeds mainly via a b→sdd¯ “penguin” amplitude. The results are sin2ϕ1eff=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 sin2ϕ1eff is consistent with that obtained using decay modes proceeding via a b→cc¯s “tree” amplitude.
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