Study of the CP asymmetry of B$^{0} \rightarrow$ J/$\psi$K$^{0}_{s}$ decays in ALEPH

Abstract : The decay B0 -> J/psi K0_S is reconstructed with J/psi -> e+ e- or mu+ mu- and K0_S -> pi+ pi-. From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%. They are used to measure the CP asymmetry of this decay, given by sin 2beta in the Standard Model, with the result sin 2beta = 0.84 +0.82-1.04 +-0.16. This is combined with existing measurements from other experiments, and increases the confidence level that CP violation has been observed in this channel to 98%.
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Journal articles

Cited literature [16 references]

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Submitted on : Friday, January 12, 2001 - 2:35:06 PM
Last modification on : Friday, October 22, 2021 - 4:29:00 AM
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• HAL Id : in2p3-00007884, version 1

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Citation

R. Barate, D. Decamp, P. Ghez, C. Goy, E. Merle, et al.. Study of the CP asymmetry of B$^{0} \rightarrow$ J/$\psi$K$^{0}_{s}$ decays in ALEPH. Physics Letters B, Elsevier, 2000, 492, pp.259-274. ⟨in2p3-00007884⟩

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