Observation of large CP violation in the neutral B meson system

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)...

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Veröffentlicht in:	Physical review letters 2001-08, Vol.87 (9), p.091802-091802, Article 091802
Hauptverfasser:	Abe, K, Abe, R, Adachi, I, Ahn, B S, Aihara, H, Akatsu, M, Alimonti, G, Asai, K, Asai, M, Asano, Y, Aso, T, Aulchenko, V, Aushev, T, Bakich, A M, Banas, E, Behari, S, Behera, P K, Beiline, D, Bondar, A, Bozek, A, Browder, T E, Casey, B C, Chang, P, Chao, Y, Chen, K F, Cheon, B G, Chistov, R, Choi, S K, Choi, Y, Dong, L Y, Dragic, J, Drutskoy, A, Eidelman, S, Eiges, V, Enari, Y, Enomoto, R, Everton, C W, Fang, F, Fujii, H, Fukunaga, C, Fukushima, M, Gabyshev, N, Garmash, A, Gershon, T J, Gordon, A, Gotow, K, Guler, H, Guo, R, Haba, J, Hamasaki, H, Hanagaki, K, Handa, F, Hara, K, Hara, T, Hastings, N C, Hayashii, H, Hazumi, M, Heenan, E M, Higasino, Y, Higuchi, I, Higuchi, T, Hirai, T, Hirano, H, Hojo, T, Hokuue, T, Hoshi, Y, Hoshina, K, Hou, S R, Hou, W S, Hsu, S C, Huang, H C, Igarashi, Y, Iijima, T, Ikeda, H, Ikeda, K, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwai, G, Iwasaki, H, Iwasaki, Y, Jackson, D J, Jalocha, P, Jang, H K, Jones, M, Kagan, R, Kakuno, H, Kaneko, J, Kang, J H, Kang, J S, Kapusta, P, Katayama, N, Kawai, H, Kawakami, Y, Kawamura, N, Kawasaki, T, Kichimi, H
Format:	Artikel
Sprache:	eng
Schlagworte:	ASYMMETRY B MESONS DAUGHTER PRODUCTS DECAY DISTRIBUTION PHYSICS OF ELEMENTARY PARTICLES AND FIELDS RESONANCE STANDARD MODEL
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.87.091802