Measurement of CP-Violating Parameters in $B\to η^\prime K$ Decays

Details Measurement of CP-Violating Parameters in $B\to η^\prime K$ Decays Measurement of CP-Violating Parameters in $B\to η^\prime K$ Decays

2002-07-15

arxiv.org/abs/hep-ex/0207033v2

Phys.Lett.B546:196-205,2002

Physics

High Energy Physics

High Energy Physics - Experiment

Revised version: 16 pages, 3 figures, 1 table submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(02)02389-4

We present measurements of CP-violating parameters in $B^0(\bar{B}{}^0) \to \eta^\prime K_S^0$ and $B^{\pm} \to \eta' K^{\pm}$ decays based on a 41.8 fb$^{-1}$ data sample collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We fully reconstruct one neutral $B$ meson as a $B^0(\bar{B}{}^0) \to \eta^\prime K_S^0$ CP eigenstate and identify the flavor of the accompanying $B$ from its decay products. From the distribution of time intervals between pairs of $B$ meson decay points, we obtain the CP-violating asymmetry parameters ${\mathcal S}_{\eta^\prime K_S^0} = 0.28\pm0.55(stat)^{+0.07}_{-0.08}(syst)$, and ${\mathcal A}_{\eta^\prime K_S^0} = 0.13\pm0.32(stat)^{+0.09}_{-0.06}(syst)$. We also reconstruct charged $B^{\pm} \to \eta^\prime K^{\pm}$ decays and determine a direct-CP violating asymmetry value of ${\mathcal A}_{\eta^\prime K^\pm}=(-1.5\pm7.0(stat)\pm0.9(syst))%$.

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