Evidence for directCPviolation in the decayB±→D(*)K±,D→KS0π+π−and measurement of the CKM phaseϕ3

A Poluektov,M J Lee,A Sokolov,S Uehara,D H Kah,R Louvot,H J Hyun,K Kinoshita,S Okuno,Y Horii,B Golob,S Korpar,J Li,P Križan,Y Watanabe,J H Kang,M E Sevior,P Kodyš,T Tsuboyama,M Röhrken,N J Joshi,S L Olsen,P Chen,S Ogawa,M Petrič,R Mizuk,T Aushev,D Epifanov,H Hayashii,Y Choi,I Adachi,Z P Zhang,M Dash,A Garmash,Y Usov,Y Miyazaki,A Chen,B Shwartz,J Wang,S Eidelman,A Vinokurova,T Kawasaki,A Bay,T E Browder,W Dungel,P Smerkol,V Shebalin,K Senyo,Y Sakai,M Bračko,P Chang,A J Schwartz,H Yamamoto,T Julius,Z Natkaniec,X L Wang,A Matyja,S Ryu,V Zhulanov,P Goldenzweig,S Mconie,H Sahoo,O Nitoh,M J Kim,C Kiesling,H K Park,J H Kim,N Katayama,H Aihara,D Liventsev,C Schwanda,R Wedd,T Ohshima,S Suzuki,G B Mohanty,T Iijima,N Gabyshev,L E Piilonen,Y J Kim,M Bischofberger,E Won,K Arinstein,T Kuhr,K Trabelsi,G Pakhlova,M Watanabe,S Stanič,B G Cheon,S Uno,J Haba,B R Ko,T Sumiyoshi,K Nishimura,C P Shen,C H Wang,S Neubauer,M Iwabuchi,K Belous,O Zyukova,Y Yamashita,V Balagura,A Kuzmin,P Wang,M Shapkin,M Nakao,K E Varvell,H Miyata,M Tanaka,W.-S Hou,V Aulchenko,Y Hoshi,V Zhilich,M Danilov,A M Bakich,M Iwasaki,C Liu,J B Singh,J S Lange,K Vervink,G Varner,S Nishida,P Kapusta,P Krokovny,K Miyabayashi,O Schneider,J Dalseno,H Ha,M Starič,A Zupanc,H J Kim,K Sumisawa,K Inami,A Bondar,A Drutskoy,K F Chen ,A Bożek ,Y Hsiung ,M C Chang ,Ramanuj Kumar ,Y J Kwon ,M Z Wang ,I S Cho ,T Živko ,B Yabsley ,S H Lee ,J G Shiu ,E L Barberio ,S H Kyeong

doi:10.1103/physrevd.81.112002

Abstract

We present a new measurement of the unitarity triangle angle phi3 using a Dalitz plot analysis of the KsPi+Pi- decay of the neutral D meson produced in B->D(*)K decays. The method exploits the interference between D0 and D0bar to extract the angle phi3, strong phase delta and the ratio r of suppressed and allowed amplitudes. We apply this method to a 605 fb-1 data sample collected by the Belle experiment. The analysis uses three decays: B->DK, and B->D*K with D*->DPi0 and D*->Dgamma, as well as the corresponding charge-conjugate modes. From a combined maximum likelihood fit to the three modes, we obtain phi3 = 78.4^+10.8_-11.6 +- 3.6 (syst) +- 8.9 (model) degrees. CP conservation in this process is ruled out at the confidence level (1-CL)=5x10^-4, or 3.5 standard deviations.

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