Study of CP-violating asymmetries in B0-->pi(+)pi(-) decays

K Abe; K Abe; T Abe; I Adachi; Byoung Sup Ahn; H Aihara; M Akatsu; Y Asano; T Aso; V Aulchenko; T Aushev; A M Bakich; Y Ban; E Banas; I Bedny; S Behari; P K Behera; A Bondar; A Bozek; M Bracko; J Brodzicka; T E Browder; B C K Casey; P Chang; Y Chao; B G Cheon; R Chistov; S-K Choi; Y Choi; M Danilov; L Y Dong; J Dragic; A Drutskoy; S Eidelman; V Eiges; Y Enari; C W Everton; F Fang; H Fujii; C Fukunaga; M Fukushima; N Gabyshev; A Garmash; T Gershon; B Golob; A Gordon; R Guo; J Haba; H Hamasaki; K Hanagaki; F Handa; K Hara; T Hara; N C Hastings; H Hayashii; M Hazumi; E M Heenan; I Higuchi; T Higuchi; T Hojo; T Hokuue; Y Hoshi; K Hoshina; S R Hou; W-S Hou; S-C Hsu; H-C Huang; T Igaki; Y Igarashi; T Iijima; H Ikeda; K Inami; A Ishikawa; H Ishino; R Itoh; M Iwamoto; H Iwasaki; Y Iwasaki; D J Jackson; P Jalocha; H K Jang; J H Kang; J S Kang; P Kapusta; N Katayama; H Kawai; H Kawai; N Kawamura; T Kawasaki; H Kichimi; D W Kim; Heejong Kim; H J Kim; H O Kim; Hyunwoo Kim; S K Kim; T H Kim; K Kinoshita; S Koishi; H Konishi; S Korpar; P Krizan; P Krokovny; R Kulasiri; S Kumar; A Kuzmin; Y-J Kwon; J S Lange; G Leder; S H Lee; A Limosani; D Liventsev; R-S Lu; J MacNaughton; G Majumder; F Mandl; D Marlow; T Matsuishi; S Matsumoto; T Matsumoto; Y Mikami; W Mitaroff; K Miyabayashi; Y Miyabayashi; H Miyake; H Miyata; G R Moloney; S Mori; T Mori; A Murakami; T Nagamine; Y Nagasaka; T Nakadaira; E Nakano; M Nakao; J W Nam; K Neichi; S Nishida; O Nitoh; S Noguchi; T Nozaki; S Ogawa; F Ohno; T Ohshima; T Okabe; S Okuno; S L Olsen; W Ostrowicz; H Ozaki; P Pakhlov; H Palka; C W Park; H Park; K S Park; L S Peak; J-P Perroud; M Peters; L E Piilonen; E Prebys; J L Rodriguez; F J Ronga; M Rozanska; K Rybicki; H Sagawa; S Saitoh; Y Sakai; H Sakamoto; M Satapathy; A Satpathy; O Schneider; S Schrenk; C Schwanda; S Semenov; K Senyo; M E Sevior; H Shibuya; B Shwartz; V Sidorov; J B Singh; S Stanic; A Sugi; A Sugiyama; K Sumisawa; T Sumiyoshi; K Suzuki; S Suzuki; S Y Suzuki; S K Swain; H Tajima; T Takahashi; F Takasaki; M Takita; K Tamai; N Tamura; J Tanaka; M Tanaka; G N Taylor; Y Teramoto; S Tokuda; M Tomoto; T Tomura; S N Tovey; K Trabelsi; W Trischuk; T Tsuboyama; T Tsukamoto; S Uehara; K Ueno; Y Unno; S Uno; Y Ushiroda; K E Varvell; C C Wang; C H Wang; J G Wang; M-Z Wang; Y Watanabe; E Won; B D Yabsley; Y Yamada; M Yamaga; A Yamaguchi; H Yamamoto; Y Yamashita; M Yamauchi; J Yashima; P Yeh; M Yokoyama; K Yoshida; Y Yuan; Y Yusa; C C Zhang; J Zhang; Y Zheng; V Zhilich; D Zontar; Belle

doi:10.1103/PhysRevLett.89.071801

Study of CP-violating asymmetries in B0-->pi(+)pi(-) decays

Phys Rev Lett. 2002 Aug 12;89(7):071801. doi: 10.1103/PhysRevLett.89.071801. Epub 2002 Jul 26.

Authors

K Abe¹, K Abe, T Abe, I Adachi, Byoung Sup Ahn, H Aihara, M Akatsu, Y Asano, T Aso, V Aulchenko, T Aushev, A M Bakich, Y Ban, E Banas, I Bedny, S Behari, P K Behera, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, B C K Casey, P Chang, Y Chao, B G Cheon, R Chistov, S-K Choi, Y Choi, M Danilov, L Y Dong, J Dragic, A Drutskoy, S Eidelman, V Eiges, Y Enari, C W Everton, F Fang, H Fujii, C Fukunaga, M Fukushima, N Gabyshev, A Garmash, T Gershon, B Golob, A Gordon, R Guo, J Haba, H Hamasaki, K Hanagaki, F Handa, K Hara, T Hara, N C Hastings, H Hayashii, M Hazumi, E M Heenan, I Higuchi, T Higuchi, T Hojo, T Hokuue, Y Hoshi, K Hoshina, S R Hou, W-S Hou, S-C Hsu, H-C Huang, T Igaki, Y Igarashi, T Iijima, H Ikeda, K Inami, A Ishikawa, H Ishino, R Itoh, M Iwamoto, H Iwasaki, Y Iwasaki, D J Jackson, P Jalocha, H K Jang, J H Kang, J S Kang, P Kapusta, N Katayama, H Kawai, H Kawai, N Kawamura, T Kawasaki, H Kichimi, D W Kim, Heejong Kim, H J Kim, H O Kim, Hyunwoo Kim, S K Kim, T H Kim, K Kinoshita, S Koishi, H Konishi, S Korpar, P Krizan, P Krokovny, R Kulasiri, S Kumar, A Kuzmin, Y-J Kwon, J S Lange, G Leder, S H Lee, A Limosani, D Liventsev, R-S Lu, J MacNaughton, G Majumder, F Mandl, D Marlow, T Matsuishi, S Matsumoto, T Matsumoto, Y Mikami, W Mitaroff, K Miyabayashi, Y Miyabayashi, H Miyake, H Miyata, G R Moloney, S Mori, T Mori, A Murakami, T Nagamine, Y Nagasaka, T Nakadaira, E Nakano, M Nakao, J W Nam, K Neichi, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, F Ohno, T Ohshima, T Okabe, S Okuno, S L Olsen, W Ostrowicz, H Ozaki, P Pakhlov, H Palka, C W Park, H Park, K S Park, L S Peak, J-P Perroud, M Peters, L E Piilonen, E Prebys, J L Rodriguez, F J Ronga, M Rozanska, K Rybicki, H Sagawa, S Saitoh, Y Sakai, H Sakamoto, M Satapathy, A Satpathy, O Schneider, S Schrenk, C Schwanda, S Semenov, K Senyo, M E Sevior, H Shibuya, B Shwartz, V Sidorov, J B Singh, S Stanic, A Sugi, A Sugiyama, K Sumisawa, T Sumiyoshi, K Suzuki, S Suzuki, S Y Suzuki, S K Swain, H Tajima, T Takahashi, F Takasaki, M Takita, K Tamai, N Tamura, J Tanaka, M Tanaka, G N Taylor, Y Teramoto, S Tokuda, M Tomoto, T Tomura, S N Tovey, K Trabelsi, W Trischuk, T Tsuboyama, T Tsukamoto, S Uehara, K Ueno, Y Unno, S Uno, Y Ushiroda, K E Varvell, C C Wang, C H Wang, J G Wang, M-Z Wang, Y Watanabe, E Won, B D Yabsley, Y Yamada, M Yamaga, A Yamaguchi, H Yamamoto, Y Yamashita, M Yamauchi, J Yashima, P Yeh, M Yokoyama, K Yoshida, Y Yuan, Y Yusa, C C Zhang, J Zhang, Y Zheng, V Zhilich, D Zontar; Belle

Affiliation

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

PMID: 12190513
DOI: 10.1103/PhysRevLett.89.071801

Abstract

We present a measurement of CP-violating asymmetries in B0-->pi(+)pi(-) decays based on a 41.8 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We fully reconstruct one neutral B meson as a B0-->pi(+)pi(-) CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain the CP-violating asymmetry parameters S(pipi)=-1.21(+0.38)(-0.27)(stat)+0.16-0.13(syst) and A(pipi)=+0.94(+0.25)(-0.31)(stat)+/-0.09(syst).