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. 2001 Aug 27;87(9):091802.
doi: 10.1103/PhysRevLett.87.091802. Epub 2001 Aug 14.

Observation of large CP violation in the neutral B meson system

K Abe  1 , K Abe, R Abe, I Adachi, B S Ahn, H Aihara, M Akatsu, G Alimonti, K Asai, M Asai, Y Asano, T Aso, V Aulchenko, T Aushev, A M Bakich, E Banas, S Behari, P K Behera, D Beiline, A Bondar, A Bozek, T E Browder, B C Casey, P Chang, Y Chao, K F Chen, B G Cheon, R Chistov, S K Choi, Y Choi, L Y Dong, J Dragic, A Drutskoy, S Eidelman, V Eiges, Y Enari, R Enomoto, C W Everton, F Fang, H Fujii, C Fukunaga, M Fukushima, N Gabyshev, A Garmash, T J Gershon, A Gordon, K Gotow, H Guler, R Guo, J Haba, H Hamasaki, K Hanagaki, F Handa, K Hara, T Hara, N C Hastings, H Hayashii, M Hazumi, E M Heenan, Y Higasino, I Higuchi, T Higuchi, T Hirai, H Hirano, T Hojo, T Hokuue, Y Hoshi, K Hoshina, S R Hou, W S Hou, S C Hsu, H C Huang, Y Igarashi, T Iijima, H Ikeda, K Ikeda, K Inami, A Ishikawa, H Ishino, R Itoh, G Iwai, H Iwasaki, Y Iwasaki, D J Jackson, P Jalocha, H K Jang, M Jones, R Kagan, H Kakuno, J Kaneko, J H Kang, J S Kang, P Kapusta, N Katayama, H Kawai, H Kawai, Y Kawakami, N Kawamura, T Kawasaki, H Kichimi, D W Kim, H Kim, H J Kim, H Kim, S K Kim, T H Kim, K Kinoshita, S Kobayashi, S Koishi, H Konishi, K Korotushenko, P Krokovny, R Kulasiri, S Kumar, T Kuniya, E Kurihara, A Kuzmin, Y J Kwon, J S Lange, G Leder, M H Lee, S H Lee, C Leonidopoulos, Y S Lin, D Liventsev, R S Lu, J MacNaughton, D Marlow, T Matsubara, S Matsui, S Matsumoto, T Matsumoto, Y Mikami, K Misono, K Miyabayashi, H Miyake, H Miyata, L C Moffitt, G R Moloney, G F Moorhead, S Mori, T Mori, A Murakami, T Nagamine, Y Nagasaka, Y Nagashima, T Nakadaira, T Nakamura, E Nakano, M Nakao, H Nakazawa, J W Nam, Z Natkaniec, K Neichi, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, T Ohshima, Y Ohshima, T Okabe, T Okazaki, S Okuno, S L Olsen, H Ozaki, P Pakhlov, H Palka, C S Park, C W Park, H Park, L S Peak, M Peters, L E Piilonen, E Prebys, J L Rodriguez, N Root, M Rozanska, K Rybicki, J Ryuko, H Sagawa, Y Sakai, H Sakamoto, M Satapathy, A Satpathy, S Schrenk, S Semenov, K Senyo, Y Settai, M E Sevior, H Shibuya, B Shwartz, A Sidorov, S Stanic, A Sugi, A Sugiyama, K Sumisawa, T Sumiyoshi, J Suzuki, 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, M Tomoto, T Tomura, S N Tovey, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, K Ueno, Y Unno, S Uno, Y Ushiroda, S E Vahsen, 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, T Yamanaka, Y Yamashita, M Yamauchi, S Yanaka, J Yashima, M Yokoyama, K Yoshida, Y Yusa, H Yuta, C C Zhang, J Zhang, H W Zhao, Y Zheng, V Zhilich, D Zontar; Belle Collaboration
Affiliations

Observation of large CP violation in the neutral B meson system

K Abe et al. Phys Rev Lett. .

Abstract

We present a measurement of the standard model CP violation parameter sin2 phi(1) based on a 29.1 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is fully reconstructed as a J/psi K(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psi K(L), or J/psi K(*0) decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2 phi(1) = 0.99+/-0.14(stat)+/-0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

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