Observation of time-dependent CP violation in B0 --> eta'K0 decays and improved measurements of CP asymmetries in B0 --> phiK0, KS0KS0KS0 and B0 --> J/psiK0 decays

K-F Chen; K Hara; M Hazumi; T Higuchi; K Miyabayashi; Y Nakahama; K Sumisawa; O Tajima; Y Ushiroda; Y Yusa; K Abe; K Abe; I Adachi; H Aihara; D Anipko; K Arinstein; V Aulchenko; T Aushev; T Aziz; A M Bakich; V Balagura; S Banerjee; E Barberio; M Barbero; A Bay; K Belous; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; M Bracko; J Brodzicka; T E Browder; P Chang; Y Chao; A Chen; W T Chen; B G Cheon; R Chistov; S-K Choi; Y Choi; Y K Choi; A Chuvikov; S Cole; J Dalseno; M Danilov; M Dash; J Dragic; A Drutskoy; S Eidelman; D Epifanov; S Fratina; A Garmash; T Gershon; A Go; G Gokhroo; P Goldenzweig; B Golob; H Ha; J Haba; T Hara; K Hayasaka; H Hayashii; D Heffernan; T Hokuue; Y Hoshi; S Hou; W-S Hou; Y B Hsiung; T Iijima; K Ikado; A Imoto; K Inami; A Ishikawa; H Ishino; R Itoh; M Iwasaki; Y Iwasaki; H Kakuno; J H Kang; S U Kataoka; N Katayama; H Kawai; T Kawasaki; H R Khan; H Kichimi; H J Kim; S K Kim; Y J Kim; K Kinoshita; S Korpar; P Krizan; P Krokovny; R Kulasiri; R Kumar; C C Kuo; A Kusaka; A Kuzmin; Y-J Kwon; G Leder; J Lee; M J Lee; T Lesiak; J Li; A Limosani; S-W Lin; Y Liu; D Liventsev; G Majumder; F Mandl; T Matsumoto; A Matyja; W Mitaroff; H Miyake; H Miyata; Y Miyazaki; R Mizuk; D Mohapatra; G R Moloney; A Murakami; T Nagamine; Y Nagasaka; I Nakamura; E Nakano; M Nakao; Z Natkaniec; S Nishida; O Nitoh; S Noguchi; T Nozaki; S Ogawa; T Ohshima; S Okuno; S L Olsen; Y Onuki; W Ostrowicz; H Ozaki; P Pakhlov; G Pakhlova; H Palka; H Park; R Pestotnik; L E Piilonen; H Sahoo; Y Sakai; N Satoyama; T Schietinger; O Schneider; J Schümann; A J Schwartz; R Seidl; K Senyo; M E Sevior; M Shapkin; H Shibuya; B Shwartz; J B Singh; A Sokolov; A Somov; S Stanic; M Staric; H Stoeck; T Sumiyoshi; S Suzuki; F Takasaki; K Tamai; N Tamura; M Tanaka; G N Taylor; Y Teramoto; X C Tian; K Trabelsi; T Tsuboyama; T Tsukamoto; S Uehara; T Uglov; K Ueno; Y Unno; S Uno; P Urquijo; Y Usov; G Varner; K E Varvell; S Villa; C C Wang; C H Wang; M-Z Wang; Y Watanabe; R Wedd; E Won; Q L Xie; B D Yabsley; A Yamaguchi; Y Yamashita; M Yamauchi; C C Zhang; Z P Zhang; V Zhilich; A Zupanc; Belle Collaboration

doi:10.1103/PhysRevLett.98.031802

Observation of time-dependent CP violation in B0 --> eta'K0 decays and improved measurements of CP asymmetries in B0 --> phiK0, KS0KS0KS0 and B0 --> J/psiK0 decays

Phys Rev Lett. 2007 Jan 19;98(3):031802. doi: 10.1103/PhysRevLett.98.031802. Epub 2007 Jan 16.

Authors

K-F Chen¹, K Hara, M Hazumi, T Higuchi, K Miyabayashi, Y Nakahama, K Sumisawa, O Tajima, Y Ushiroda, Y Yusa, K Abe, K Abe, I Adachi, H Aihara, D Anipko, K Arinstein, V Aulchenko, T Aushev, T Aziz, A M Bakich, V Balagura, S Banerjee, E Barberio, M Barbero, A Bay, K Belous, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, P Chang, Y Chao, A Chen, W T Chen, B G Cheon, R Chistov, S-K Choi, Y Choi, Y K Choi, A Chuvikov, S Cole, J Dalseno, M Danilov, M Dash, J Dragic, A Drutskoy, S Eidelman, D Epifanov, S Fratina, A Garmash, T Gershon, A Go, G Gokhroo, P Goldenzweig, B Golob, H Ha, J Haba, T Hara, K Hayasaka, H Hayashii, D Heffernan, T Hokuue, Y Hoshi, S Hou, W-S Hou, Y B Hsiung, T Iijima, K Ikado, A Imoto, K Inami, A Ishikawa, H Ishino, R Itoh, M Iwasaki, Y Iwasaki, H Kakuno, J H Kang, S U Kataoka, N Katayama, H Kawai, T Kawasaki, H R Khan, H Kichimi, H J Kim, S K Kim, Y J Kim, K Kinoshita, S Korpar, P Krizan, P Krokovny, R Kulasiri, R Kumar, C C Kuo, A Kusaka, A Kuzmin, Y-J Kwon, G Leder, J Lee, M J Lee, T Lesiak, J Li, A Limosani, S-W Lin, Y Liu, D Liventsev, G Majumder, F Mandl, T Matsumoto, A Matyja, W Mitaroff, H Miyake, H Miyata, Y Miyazaki, R Mizuk, D Mohapatra, G R Moloney, A Murakami, T Nagamine, Y Nagasaka, I Nakamura, E Nakano, M Nakao, Z Natkaniec, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, T Ohshima, S Okuno, S L Olsen, Y Onuki, W Ostrowicz, H Ozaki, P Pakhlov, G Pakhlova, H Palka, H Park, R Pestotnik, L E Piilonen, H Sahoo, Y Sakai, N Satoyama, T Schietinger, O Schneider, J Schümann, A J Schwartz, R Seidl, K Senyo, M E Sevior, M Shapkin, H Shibuya, B Shwartz, J B Singh, A Sokolov, A Somov, S Stanic, M Staric, H Stoeck, T Sumiyoshi, S Suzuki, F Takasaki, K Tamai, N Tamura, M Tanaka, G N Taylor, Y Teramoto, X C Tian, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, T Uglov, K Ueno, Y Unno, S Uno, P Urquijo, Y Usov, G Varner, K E Varvell, S Villa, C C Wang, C H Wang, M-Z Wang, Y Watanabe, R Wedd, E Won, Q L Xie, B D Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, C C Zhang, Z P Zhang, V Zhilich, A Zupanc; Belle Collaboration

Affiliation

¹ Department of Physics, National Taiwan University, Taipei.

PMID: 17358677
DOI: 10.1103/PhysRevLett.98.031802

Abstract

We present improved measurements of CP-violation parameters in B(0) --> phiK(0), eta(')K(0), KS(0)KS(0)KS(0) decays based on a sample of 535 x 10(6) BB pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We obtain sin2phi1(eff)=+0.64+/-0.10(stat)+/-0.04(syst) for B(0) --> eta(')K(0), +0.50+/-0.21(stat)+/-0.06(syst) for B(0) --> phiK(0), and +0.30+/-0.32(stat)+/-0.08(syst) for B(0) --> KS(0)KS(0)KS(0) decays. We have observed CP violation in the B(0) --> eta(')K(0) decay with a significance of 5.6 standard deviations. We also perform an improved measurement of CP asymmetries in B(0) --> J/psiK(0) decays and obtain sin2phi1=+0.642+/-0.031(stat)+/-0.017(syst).