Precise measurement of the CP violation parameter sin2φ1 in B0→(cc¯)K0 decays

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

doi:10.1103/PhysRevLett.108.171802

Precise measurement of the CP violation parameter sin2φ1 in B0→(cc¯)K0 decays

Phys Rev Lett. 2012 Apr 27;108(17):171802. doi: 10.1103/PhysRevLett.108.171802. Epub 2012 Apr 23.

Authors

I Adachi¹, H Aihara, D M Asner, V Aulchenko, T Aushev, T Aziz, A M Bakich, A Bay, V Bhardwaj, B Bhuyan, M Bischofberger, A Bondar, A Bozek, M Bračko, T E Browder, P Chen, B G Cheon, K Chilikin, R Chistov, K Cho, S-K Choi, Y Choi, J Dalseno, M Danilov, Z Doležal, Z Drásal, S Eidelman, D Epifanov, J E Fast, V Gaur, N Gabyshev, A Garmash, Y M Goh, B Golob, J Haba, K Hara, T Hara, K Hayasaka, H Hayashii, T Higuchi, Y Horii, Y Hoshi, W-S Hou, Y B Hsiung, H J Hyun, T Iijima, A Ishikawa, R Itoh, M Iwabuchi, Y Iwasaki, T Iwashita, T Julius, P Kapusta, N Katayama, T Kawasaki, H Kichimi, C Kiesling, H J Kim, H O Kim, J B Kim, J H Kim, K T Kim, Y J Kim, K Kinoshita, B R Ko, S Koblitz, P Kodyš, S Korpar, P Križan, P Krokovny, T Kuhr, R Kumar, T Kumita, A Kuzmin, Y-J Kwon, J S Lange, S-H Lee, J Li, Y Li, C Liu, Y Liu, Z Q Liu, D Liventsev, R Louvot, D Matvienko, S McOnie, K Miyabayashi, H Miyata, Y Miyazaki, R Mizuk, G B Mohanty, T Mori, N Muramatsu, E Nakano, M Nakao, H Nakazawa, S Neubauer, S Nishida, K Nishimura, O Nitoh, S Ogawa, T Ohshima, S Okuno, S L Olsen, Y Onuki, H Ozaki, P Pakhlov, G Pakhlova, H K Park, K S Park, T K Pedlar, R Pestotnik, M Petrič, L E Piilonen, A Poluektov, M Röhrken, M Rozanska, H Sahoo, K Sakai, Y Sakai, T Sanuki, Y Sato, O Schneider, C Schwanda, A J Schwartz, K Senyo, V Shebalin, C P Shen, T-A Shibata, J-G Shiu, B Shwartz, A Sibidanov, F Simon, J B Singh, P Smerkol, Y-S Sohn, A Sokolov, E Solovieva, S Stanič, M Starič, M Sumihama, K Sumisawa, T Sumiyoshi, S Tanaka, G Tatishvili, Y Teramoto, I Tikhomirov, K Trabelsi, T Tsuboyama, M Uchida, S Uehara, T Uglov, Y Unno, S Uno, Y Ushiroda, S E Vahsen, G Varner, K E Varvell, A Vinokurova, V Vorobyev, C H Wang, M-Z Wang, P Wang, M Watanabe, Y Watanabe, K M Williams, E Won, B D Yabsley, H Yamamoto, Y Yamashita, M Yamauchi, Y Yusa, Z P Zhang, V Zhilich, A Zupanc, O Zyukova; Belle Collaboration

Affiliation

¹ High Energy Accelerator Research Organization (KEK), Tsukuba, Japan.

PMID: 22680852
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).