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Observation of large CP violation in the neutral B meson system |
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| Authors: | Abe K 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 |
| Affiliation: | High Energy Accelerator Research Organization (KEK), Tsukuba. |
| 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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