Precise measurement of the CP violation parameter $\sin2φ_1$ in $B^0\to(c\bar c)K^0$ decays

Details Precise measurement of the CP violation parameter $\sin2φ_1$ in $B^0\to(c\bar c)K^0$ decays Precise measurement of the CP violation parameter $\sin2φ_1$ in $B^0\to(c\bar c)K^0$ decays

2012-01-23

arxiv.org/abs/1201.4643v1

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 2 figures, 3 tables, submitted to PRL

Scientific paper

We present a precise measurement of the CP violation parameter $\sin2\phi_1$ and the direct CP violation parameter ${\cal A}_f$ using the final data sample of $772\times10^6$ $B\bar B$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. One neutral $B$ meson is reconstructed in a $J/\psi K^0_S$, $\psi(2S)K^0_S$, $\chi_{c1}K^0_S$ or $J/\psi K^0_L$ CP-eigenstate and its flavor is identified from the decay products of the accompanying $B$ meson. From the distribution of proper time intervals between the two B decays, we obtain the following CP violation parameters: $\sin2\phi_1=0.667\pm0.023(stat)\pm0.012(syst)$ and ${\cal A}_f=0.006\pm0.016(stat)\pm0.012(syst)$.

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