Measurement of the CP violation parameters in $B^0 \to \pi^+ \pi^-$ decays

I Adachi,T Kuhr,Takashi Iwashita, Y Chao,S Esen,Z Natkaniec,D Liventsev,B R Ko, S Vahsen,D Epifanov,H Kichimi,V Chekelian,R Pestotnik, Sachiko Shinomiya,H Shibuya,J Crnkovic,S L Olsen,K Hayasaka,K Sumisawa,T Uglov,H Kakuno,M Peters,Yasutoshi Koga,Durgashree Dutta,Y F Tse, Y Choi,Toshiyuki Mori, C Z Yuan,R Seidl, F Thorne,S H Lee,J Dalseno,K Hoshina,I Jaegle,W Dungel,E J White,L M Zhang,P Schonmeier,A Poluektov,S Okuno, Toshiharu Higuchi, M Leitgab,G B Mohanty, B Schwenker,K Cho,B G Cheon,O Schneider,Penghua Wang, G Varner,M Prim,Z Q Liu,Y Teramoto,T Muller,N Zwahlen,K F Chen,A Ogawa,B Golob,K Arinstein, T Iijima, A Ishikawa, J S Lange, Masayoshi Iwasaki,S Suzuki,S Neubauer,K Tanida,A Bozek, Shiro Sugihara,J Libby, H J Hyun,M B Jones,Hiroyuki Nakayama,K Negishi,Tomiki Sumiyoshi,Yasuo Watanabe,J Yamaoka,K Inami,M Sumihama, J Fast,Jun Li,L Santelj,Hiroki Kawai,J Stypula,V Zhilich,M J Lee,Makoto Uchida, Kazutaka Hara,Yutaka Miyazaki,O Zyukova, H Hayashii, A Limosani,Tao Peng, Yuichi Sakai,J Haba,Y Yamashita,S Korpar,B Reisert, A Bay, M Petric,Y J Kwon,S Uehara,D Mohapatra,S Ogawa,H Takeichi,Y Miyachi,J Klucar,Koichi Nishimura,T Julius,E Solovieva,T Aushev,Li Shang,Y Sato,Hiroyuki Nakazawa,G Bonvicini,E Won,R Mizuk,Kiyoshi Sakai,J Brodzicka,L E Piilonen,M Ritter,K Vervink, T K Pedlar,Shuji Tanaka,Yoji Hasegawa,Xia Li,N Katayama,K Ueno,W Ostrowicz, P Krizan,K Adamczyk,Akira Sekiya,T Tsuboyama,M Bracko,Kyoung Soon Choi,V Aulchenko,M Rozanska,Naoyuki Taniguchi,Anthony P Moll,S Ryu,K Kinoshita,Peng Zhou,M Z Wang,E Nedelkovska,O Seon,Pohsun Chen,Richard T Kouzes, T Aziz, P Hamer,C W Park,Yongwei Li,R Kumar, Masayuki Imamura,V Bhardwaj,T A Shibata,K Neichi,V Gaur,O Nitoh, M Staric, Y Unno,J Wicht,Y S Sohn,S Blyth,K M Williams,Pocheng Chang,Y Hoshi,P Smerkol,I Tikhomirov,R Chistov,V Vorobyev,Masataka Watanabe, D Marlow,G Tatishvili,K Belous, E Barberio,U Tamponi,H Sahoo,Y M Goh,M Nayak,Masatoshi Tanaka,P Vanhoefer, D Matvienko,M Niiyama,E Kurihara, J B Singh,Y Mikami,S Eidelman,Yasuhiro Igarashi,C L Lim, P Kodys,S Mconie, V Zhulanov, R Mussa,S U Kataoka,S Uno, M Nakao,Yoshiyuki Uchida,I S Cho,T Nozaki, H Aihara, M Feindt, Hyo Jong Kim,X L Wang, S H Kyeong, Y Ban,I Bedny,Tomoyuki Sanuki,T Aso,C C Zhang,Bo Hyun Kim,C Schwanda,K Senyo,D Santel,S Koblitz,H Palka,Y Horii,H K Park,A Chen,Toshisuke Kawasaki,Akihiko Sugiyama, E Panzenbock,K Prothmann, Yuko Arita,T E Browder, Takashi Nakano,N Gabyshev,Y Ushiroda, W S Hou,A Drutskoy,P Krokovny, C P Shen,A J Schwartz,M Shapkin,K Chilikin,A Matyja,P Pakhlov, D M Asner, Y Nakahama, J H Kim,Masashi Iwabuchi,L S Peak,Hiroshi Yamamoto,M E Sevior,Chao Liu, G N Taylor, Y Nagasaka,M Grosse Perdekamp,D Heffernan, Fredericemile Simon,T Nagamine, Y J Kim, Z Drasal,V Shebalin,I Nakamura,T Zivko, M Rohrken, Huifeng Guo,O Brovchenko,C H Wang,H Miyata, Toshiki Uchida,A Bondar,S K Choi,D Zander,A Vossen,M Kreps,Kwang Taik Kim,N Kobayashi,A Sibidanov,P Kapusta,K Miyabayashi,B Bhuyan,N Muramatsu, Jiemin Wang,Y Yusa,B Kronenbitter,Z Dolezal,R Itoh,J Wiechczynski, J Dingfelder,S Stanic,J G Shiu, Liang Zhao, A Zupanc,Jamal Rorie, Y Iwasaki,R Wedd, G Schnell,M Danilov,M Belhorn,A Sokolov,M C Chang,K Trabelsi,Min Jung Kim,M Barrett, P Kvasnicka, J H Kang,A Vinokurova, P Urquijo, A Kuzmin, K E Varvell,Koji Suzuki, Hiroya Ozaki,Y Kuroki,R K Sinha,Y B Hsiung, Y Liu,M Fujikawa,T Kumita,B D Yabsley,E Nakano,G Pakhlova,S Nishida,R Louvot,S Sandilya,B Shwartz, N Sasao, A Frey,T Hara,R Leitner,D H Kah, Z P Zhang,A Garmash,S K Kim,C Van Hulse,A M Bakich,L Widhalm,M Yamauchi,C Ng, T Ohshima,J Macnaughton,C Kiesling,K S Park,Y L Han,Yoshichika Onuki,So Iwata,Y Usov,M Bischofberger

PHYSICAL REVIEW D（2013）

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摘要

We present a measurement of the charge-parity (CP) violating parameters in B-0 -> pi(+) pi(-) decays. The results are obtained from the final data sample containing 772 x 10(6) B (B) over bar 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 A(cp)(B-0 -> pi(+) pi(-)) = +0.33 +/- 0.06(stat) +/- 0.03(syst), S-cp(B-0 -> pi(+) pi(-)) = -0.64 +/- 0.08(stat) +/- 0.03(syst), where A(CP) and S-CP represent the direct and mixing-induced CP asymmetries in B-0 -> pi(+) pi(-) decays, respectively. Using an isospin analysis including results from other Belle measurements, we find 23.8 degrees < phi(2) < 66.8 degrees is disfavored at the 1 sigma level, where phi(2) is one of the three interior angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle related to B-u,B-d decays.

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cp violation,isospin

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