Observation of time-dependent CP violation in B-0 ->eta K-'(0) decays and improved measurements of CP asymmetries in B-0 ->phi K-0, (KSKSKS0)-K-0-K-0 and B-0 -> J/psi K-0 decays

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Observation of time-dependent CP violation in B-0 ->eta K-'(0) decays and improved measurements of CP asymmetries in B-0 ->phi K-0, (KSKSKS0)-K-0-K-0 and B-0 -> J/psi K-0 decays

Chen, KF; Hara, K; Hazumi, M; Higuchi, T; Miyabayashi, K; Nakahama, Y; Sumisawa, K; ... Belle Collaboration; + view all (2007) Observation of time-dependent CP violation in B-0 ->eta K-'(0) decays and improved measurements of CP asymmetries in B-0 ->phi K-0, (KSKSKS0)-K-0-K-0 and B-0 -> J/psi K-0 decays. PHYS REV LETT , 98 (3) , Article 031802. 10.1103/PhysRevLett.98.031802. Green open access

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Abstract

We present improved measurements of CP-violation parameters in B-0 -> phi K-0, eta K-'(0), (KSKSKS0)-K-0-K-0 decays based on a sample of 535 x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. We obtain sin2 phi(eff)(1) = +0.64 +/- 0.10(stat) +/- 0.04(syst) for B-0 -> eta K-'(0), +0.50 +/- 0.21(stat) +/- 0.06(syst) for B-0 ->phi K-0, and +0.30 +/- 0.32(stat) +/- 0.08(syst) for B-0 -> (KSKSKS0)-K-0-K-0 decays. We have observed CP violation in the B-0 -> eta K-'(0) decay with a significance of 5.6 standard deviations. We also perform an improved measurement of CP asymmetries in B-0 -> J/psi K-0 decays and obtain sin2 phi(1) = +0.642 +/- 0.031(stat) +/- 0.017(syst).

Type:	Article
Title:	Observation of time-dependent CP violation in B-0 ->eta K-'(0) decays and improved measurements of CP asymmetries in B-0 ->phi K-0, (KSKSKS0)-K-0-K-0 and B-0 -> J/psi K-0 decays
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1103/PhysRevLett.98.031802
Publisher version:	http://dx.doi.org/10.1103/PhysRevLett.98.031802
Language:	English
Additional information:	© 2007 The American Physical Society
Keywords:	B-DECAYS, BELLE, PHYSICS
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI:	https://discovery.ucl.ac.uk/id/eprint/1308531

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