Journal article

Measurement of CP-violating parameters in B -> eta ' K decays

KF Chen, K Hara, K Abe, K Abe, T Abe, I Adachi, BS Ahn, H Aihara, M Akatsu, Y Asano, T Aso, V Aulchenko, T Aushev, AM Bakich, Y Ban, A Bay, I Bedny, PK Behera, I Bizjak, A Bondar Show all

PHYSICS LETTERS B | ELSEVIER SCIENCE BV | Published : 2002

Abstract

We present measurements of CP-violating parameters in B0(B0) → η′ KS0 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′ KS0 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′ KS0 = 0.28 ± 0.55(stat)-0.08+0.07(syst), and Aη′ KS0 = 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 ..

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