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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
Authors:Chen K-F  Hara K  Hazumi M  Higuchi T  Miyabayashi K  Nakahama Y  Sumisawa K  Tajima O  Ushiroda Y  Yusa Y  Abe K  Abe K  Adachi I  Aihara H  Anipko D  Arinstein K  Aulchenko V  Aushev T  Aziz T  Bakich A M  Balagura V  Banerjee S  Barberio E  Barbero M  Bay A  Belous K  Bitenc U  Bizjak I  Blyth S  Bondar A  Bozek A  Bracko M  Brodzicka J  Browder T E  Chang P  Chao Y  Chen A  Chen W T  Cheon B G  Chistov R  Choi S-K  Choi Y  Choi Y K  Chuvikov A  Cole S  Dalseno J  Danilov M  Dash M  Dragic J  Drutskoy A  Eidelman S  Epifanov D  Fratina S  Garmash A  Gershon T  Go A  Gokhroo G  Goldenzweig P  Golob B  Ha H  Haba J  Hara T  Hayasaka K  Hayashii H
Institution:Department of Physics, National Taiwan University, Taipei.
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).
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