Precise Measurement of theCPViolation Parametersin﻿2ϕ1inB0→(cc¯)K0Decays

I Adachi,H J Kim,K Sumisawa,D Epifanov,R Louvot,V Bhardwaj,Y Hoshi,M Yamauchi,T K Pedlar,A Bondar,A Garmash,P Krokovny,V Gaur,Y Sakai,V Aulchenko,T Sanuki,Y J Kim,A M Bakich,Y Teramoto,J B Kim,T Aushev,T Iwashita,J Haba,S Korpar,K M Williams,T Julius,Y Miyazaki,H K Park,K Hayasaka,O Nitoh,T Iijima,V Shebalin,H Miyata,A Ishikawa,J H Kim,G Varner,A Bay,A Vinokurova,J E Fast,H Kichimi,N Gabyshev,K E Varvell,Y M Goh,Z Q Liu,B G Cheon,C Liu,K Senyo,M Starič,D Matvienko,Y Sato,T Aziz,O Zyukova,Y Onuki,Z Doležal,H Yamamoto,H Hayashii,B Bhuyan,T Uglov,M Bračko,N Katayama,B R Ko,R Chistov,E Solovieva,M Watanabe,M Nakao,O Schneider,T Tsuboyama,S Ogawa,R Itoh,M Röhrken,K Kinoshita,M Uchida,P Kodyš,A Sokolov,V Vorobyev,N Muramatsu,H Ozaki,Y Unno,P Križan,A J Schwartz,P Wang,S Tanaka,T Hara,J S Lange,B Shwartz,T Ohshima,S Neubauer,T Kawasaki,M Iwabuchi,M Sumihama,G Tatishvili,M.-Z Wang,M Danilov,G B Mohanty,K Cho,M Petrič,Y Liu,Y Horii,B Golob,P Kapusta,H Sahoo,W.-S Hou,M Bischofberger,H J Hyun,K Hara,Y Ushiroda,A Sibidanov,C P Shen,S Uno,L E Piilonen,E Nakano,J B Singh,Y Watanabe,J Dalseno,E Won,R Kumar,H O Kim,R Mizuk,S.-H Lee,Z P Zhang,S Eidelman,T Higuchi,H Aihara,S Nishida,K T Kim,S Mconie,Y Yusa,S Okuno,S Stanič,C H Wang,A Kuzmin,Y Li,K Trabelsi,S Uehara,F Simon,T E Browder,S L Olsen,Y Yamashita,J Li,D M Asner,G Pakhlova,R Pestotnik,Z Drásal,I Tikhomirov,A Poluektov,T Sumiyoshi,V Zhilich,S Koblitz,Y Choi,P Chen,P Smerkol,K Chilikin,K S Park,K Miyabayashi,T Kumita,T Kuhr,C Kiesling,C Schwanda,D Liventsev,H Nakazawa,A Zupanc,P Pakhlov,K Nishimura,B Yabsley ,Takashi Mori ,Y J Kwon ,T A Shibata ,S Vahsen ,A Bożek ,J G Shiu ,M Różańska ,Kenichi Sakai ,S K Choi ,Y S Sohn ,Y Hsiung ,M Iwasaki

doi:10.1103/physrevlett.108.171802

Abstract

We present a precise measurement of the CP violation parameter sin2φ1 and the direct CP violation parameter A(f) using the final data sample of 772×10(6) BB[over ¯] pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is reconstructed in a J/ψK(S)(0), ψ(2S)K(S)(0), χ(c1)K(S)(0), or J/ψK(L)(0) CP eigenstate and its flavor is identified from the decay products of the accompanying B meson. From the distribution of proper-time intervals between the two B decays, we obtain the following CP violation parameters: sin2φ1=0.667±0.023(stat)±0.012(syst) and A(f)=0.006±0.016(stat)±0.012(syst).

Full Text