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Measurement of time-dependent CP-violating asymmetries in B-0 ->phi K-S(0), (K+K-KS0), and eta K-'(S)0 decays

Abe, K; Abe, K; Abe, T; Adachi, I; Aihara, H; Akai, K; Akatsu, M; ... Belle Collaboration; + view all (2003) Measurement of time-dependent CP-violating asymmetries in B-0 ->phi K-S(0), (K+K-KS0), and eta K-'(S)0 decays. PHYS REV LETT , 91 (26) , Article 261602. 10.1103/PhysRevLett.91.261602. Green open access

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Abstract

We present an improved measurement of CP-violation parameters in B-0-->phiK(S)(0), (K+K-KS0), and eta(')K(S)(0) decays based on a 140 fb(-1) data sample collected at the Y(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters for each of the three modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. We find that the observed CP asymmetry in the B-->phiK(S)(0) decay differs from the standard model (SM) expectation by 3.5 standard deviations, while the other cases are consistent with the SM.

Type: Article
Title: Measurement of time-dependent CP-violating asymmetries in B-0 ->phi K-S(0), (K+K-KS0), and eta K-'(S)0 decays
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.91.261602
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.91.261602
Language: English
Additional information: © 2003 The American Physical Society
Keywords: B-DECAYS
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/1308412
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