Measurement of theCPviolation parameters inB0→π+π−decays

J Dalseno,I Adachi,T Sumiyoshi,K Chilikin,T Aushev,R Chistov,J Klucar,D M Asner,D Semmler,K Dutta,L Li Gioi,K Trabelsi,D Cinabro,H Park,Y Hoshi,A J Schwartz,Y Watanabe,A Frey,C P Shen,M Starič,C H Wang,P Krokovny,Z P Zhang,Y Yusa,A Drutskoy,S Ogawa,B Shwartz,M Sumihama,B Bhuyan,S Uehara,R Mizuk,T K Pedlar,V Bhardwaj,B G Cheon,O Nitoh,M Feindt,B Golob,T Kawasaki,A Zupanc,S Eidelman,A Bala,Y Yamashita,A Rostomyan,T Tsuboyama,Y Li,S Korpar,V Chobanova,H J Hyun,P Pakhlov,Y Teramoto,M Steder,Y M Goh,A Kuzmin,A Bay,Y Ushiroda,T Julius,S Nishida,B R Ko,K Kinoshita,K Sumisawa,E Won,G Bonvicini,M Shapkin,S Yashchenko,M Watanabe,Y Yook,P Vanhoefer,H Farhat,N K Nisar,M Nakao,H Sahoo,S Okuno,K Prothmann,R Pestotnik,O Schneider,M Danilov,Z Drásal,L E Piilonen,D H Kah,R Mussa,R Itoh,T Hara,C Schwanda,K Hayasaka,E Solovieva,G B Mohanty,V Savinov,M Nayak,K Senyo,A Chen,A M Bakich,M Bračko,G Tatishvili,O Seon,V Vorobyev,S Sandilya,A Moll,G Schnell,M Uchida,H Kawai,Y Choi,G Pakhlova,T Sanuki,K Arinstein,B Kronenbitter,Y Sakai,S Uno,T Ferber,T E Browder,C Kiesling,T Iijima,C Niebuhr,H Hayashii,A Ishikawa,K Miyabayashi,J Haba,H Miyata,E Kato,R Gillard,S L Olsen,M Röhrken,E Nedelkovska,D Liventsev,D Matvienko,V Gaur,U Tamponi,Z Doležal,P Križan,M E Sevior,V Chekelian,C Z Yuan,T Higuchi,T Uglov,J Libby,S Ryu,J B Kim,Y.-J Kwon,V Aulchenko,P Wang,P Chen,P K Behera ,P Lukin,S K Choi ,S H Lee ,J G Shiu ,A Bondar,H G Moser ,M Ritter,Y S Sohn ,D Y Kim,M Petrič,C Liu,C W Park,D Dutta,Y J Kim,H Aihara,X L Wang,P Urquijo,Y Nagasaka,H K Park,K M Williams,S Ganguly,Y Unno,L Šantelj ,M Iwasaki ,H Yamamoto,V Zhilich,Takashi Mori ,C Van Hulse,C R Ng ,B Yabsley ,K Cho,N Muramatsu,J H Kim,S Stanič,V Zhulanov,J E Fast,A Bożek ,T Saito,H J Kim,T A Shibata ,W.-S Hou,J Li,A Sibidanov,G Varner,K T Kim,M N Wagner,F Simon,S Vahsen ,P Kodyš

doi:10.1103/physrevd.88.092003

Abstract

We present a measurement of the time-dependent charge-parity (CP) violation parameters in B0 -> pi+ pi- decays. The results are obtained from the final data sample containing 772 million BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the CP violation parameters Acp = +0.33 +/- 0.06 (stat) +/- 0.03 (syst) and Scp = -0.64 +/- 0.08 (stat) +/- 0.03 (syst), where Acp and Scp represent the direct and mixing-induced CP asymmetry, respectively. Using an isospin analysis including results from other Belle measurements, we find 23.8 < phi2 < 66.8 degrees is disfavored at the 1 sigma level, where phi2 is one of the three interior angles of the CKM unitarity triangle related to B_{u,d} decays.

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