| year | 2000 |
| author(s) | R. Barate et al. |
| title | Study of the CP asymmetry of decays in ALEPH |
| KIP-Nummer | HD-KIP 00-104 |
| KIP-Gruppe(n) | ALEPH |
| document type | Paper |
| source | Physics Letters B Volume 492, Issues 3-4, 2000, Pages 259-274 |
| Abstract (de) | The decay B0→J/ψ K0S is reconstructed with J/ψ→e+e− or μ+μ− and K0S→π+π−. 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 sin2β in the Standard Model, with the result sin2β=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%. |
| Abstract (en) | The decay B0→J/ψ K0S is reconstructed with J/ψ→e+e− or μ+μ− and K0S→π+π−. 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 sin2β in the Standard Model, with the result sin2β=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%. |
| URL | link |
