Investigation of CP violation in $B^0 \to J/\psi K^0_{S}$ decays at LEP

An investigation of CP violation was performed using a total of 24 candidates for B^0 -> J/psi K^0_S decay, with a purity of about 60%. These events were selected from 4.4 million hadronic Z^0 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, B^0 or B^0(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.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
bottom: pair production
B0: hadronic decay
particle identification: flavor
mass spectrum: (J/psi(3100) K0(S))
CP: violation
CKM matrix matrix
J/psi(3100): leptonic decay

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Figures(0)

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