We present measurements of CP-violating parameters in B0(B0) → η′ KS 0 and B± → η′ K± decays based on a 41.8 fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct one neutral B meson as a B0(B0) → η′ KS 0 CP eigenstate and identify the flavor of the accompanying B from its decay products. From the distribution of proper time intervals between pairs of B meson decay points, we obtain the CP-violating asymmetry parameters Sη′ KS 0 = 0.28 ± 0.55(stat)-0.08 +0.07(syst), and Aη′ KS 0 = 0.13 ± 0.32(stat)-0.06 +0.09(syst). We also reconstruct charged B± → η′ K± decays and determine a direct-CP-violating asymmetry value of Aη′ K± = (-1.5 ± 7.0(stat) ± 0.9(syst))%.
|Number of pages||10|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2002 Oct 24|
- B decays
- CP violations
ASJC Scopus subject areas
- Nuclear and High Energy Physics