Investigation of CP violation in B⁰ → J/ψ K_s⁰ decays at LEP

1998/01/01 by The OPAL Collaboration, K. Ackerstaff et al., K. Ackerstaff et al +100 · 1 citation
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1007/s100520050284

published as Eur.Phys.J.C5:379-388,1998 · 21 pages, LaTeX, 4 eps figures included, submitted to Phys. Lett. B

openalex publication_date 1998/01/01 · arxiv created 1998/01/23 · arxiv updated 2009/11/30 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/04

Abstract

An investigation of CP violation was performed using a total of 24 candidates for B⁰ -> J/psi K⁰_S decay, with a purity of about 60%. These events were selected from 4.4 million hadronic Z⁰ decays recorded by the OPAL detector at LEP. An analysis procedure, involving techniques to reconstruct the proper decay times and tag the produced b-flavours, B⁰ or B⁰(bar), has been developed to allow a first direct study of the time dependent CP asymmetry that, in the Standard Model, is sin(2beta). The result is sin(2beta) = 3.2_-2.0^+1.8 +/- 0.5, where the first error is statistical and the second systematic. This result is used to determine probabilities for different values of sin(2beta) in the physical region from -1 to +1.

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