Measurement of CP violating asymmetries in B^0 -&gt; K^+K^- K^0_S decays with a time-dependent Dalitz approach
Creators: name: Belle Collaboration
name: Nakahama, Y.
name: Sumisawa, K.
name: Aihara, H.
name: Arinstein, K.
name: Aushev, T.
name: Aziz, T.
name: Bakich, A. M.
name: Balagura, V.
name: Belous, K.
name: Bhardwaj, V.
name: Bischofberger, M.
name: Bondar, A.
name: Bonvicini, G.
name: Bozek, A.
name: Bracko, M.
name: Browder, T. E.
name: Chang, P.
name: Chao, Y.
name: Chen, A.
name: Chen, P.
name: Cheon, B. G.
name: Chiang, C. -C.
name: Cho, I. -S.
name: Choi, Y.
name: Dalseno, J.
name: Das, A.
name: Dolezal, Z.
name: Drasal, Z.
name: Drutskoy, A.
name: Eidelman, S.
name: Goldenzweig, P.
name: Golob, B.
name: Haba, J.
name: Hara, K.
name: Hayasaka, K.
name: Hazumi, M.
name: Higuchi, T.
name: Horii, Y.
name: Hoshi, Y.
name: Hou, W. -S.
name: Hsiung, Y. B.
name: Hyun, H. J.
name: Inami, K.
name: Itoh, R.
name: Iwabuchi, M.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Julius, T.
name: Kang, J. H.
name: Kapusta, P.
name: Katayama, N.
name: Kawai, H.
name: Kawasaki, T.
name: Kichimi, H.
name: Kim, H. J.
name: Kim, J. H.
name: Kim, M. J.
name: Ko, B. R.
name: Kodys, P.
name: Korpar, S.
name: Krizan, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kumita, T.
name: Kyeong, S. -H.
name: Lee, M. J.
name: Lee, S. -H.
name: Liu, Y.
name: Louvot, R.
name: Matyja, A.
name: McOnie, S.
name: Miyabayashi, K.
name: Miyata, H.
name: Miyazaki, Y.
name: Mohanty, G. B.
name: Nakano, E.
name: Nakao, M.
name: Nakazawa, H.
name: Neubauer, S.
name: Nishida, S.
name: Nishimura, K.
name: Nitoh, O.
name: Nozaki, T.
name: Ogawa, S.
name: Ohshima, T.
name: Olsen, S. L.
name: Ostrowicz, W.
name: Ozaki, H.
name: Park, C. W.
name: Park, H.
name: Park, H. K.
name: Pestotnik, R.
name: Petric, M.
name: Piilonen, L. E.
name: Prim, M.
name: Sahoo, H.
name: Sakai, Y.
name: Schneider, O.
name: Schwanda, C.
name: Schwartz, A. J.
name: Senyo, K.
name: Sevior, M. E.
name: Shapkin, M.
name: Shen, C. P.
name: Shiu, J. -G.
name: Shwartz, B.
name: Smerkol, P.
name: Solovieva, E.
name: Stanic, S.
name: Staric, M.
name: Sumiyoshi, T.
name: Teramoto, Y.
name: Trabelsi, K.
name: Uehara, S.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Ushiroda, Y.
name: Varner, G.
name: Varvell, K. E.
name: Vervink, K.
name: Wang, C. H.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, Y.
name: Wedd, R.
name: Won, E.
name: Yamashita, Y.
name: Yusa, Y.
name: Zander, D.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhou, P.
name: Zivko, T.
name: Zupanc, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report a measurement of $CP$ violating asymmetries in $B^0(\overline{B}^0) \to K^+ K^- K^0_S$ decays with a time-dependent Dalitz approach. This analysis is based on a data sample of $657\times 10^6$ $B\overline{B}$ pairs accumulated at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. As the result of an unbinned maximum likelihood fit to the selected candidates, the mixing-induced and direct $CP$ violation parameters, $ϕ^{\rm eff}_1$ and ${\cal A}_{CP}$ are obtained for $B^0 \to ϕ(1020) K^0_S$, $B^0 \to f_0(980) K^0_S$ and other $B^0 \to K^+ K^- K^0_S$ decays. We find four solutions that describe the data. There are \{eqnarray*} ϕ_1^{\rm eff}(B^0\to ϕ(1020) K^0_S) &amp; = &amp; (32.2 \pm 9.0 \pm 2.6 \pm 1.4)^{\circ}; ϕ_1^{\rm eff}(B^0\to ϕ(1020) K^0_S) &amp; = &amp; (26.2 \pm 8.8 \pm 2.7 \pm 1.2)^{\circ};\\ ϕ_1^{\rm eff}(B^0\to ϕ(1020) K^0_S) &amp; = &amp; (27.3 \pm 8.6 \pm 2.8 \pm 1.3)^{\circ}\; {\rm and}\\ ϕ_1^{\rm eff}(B^0\to ϕ(1020) K^0_S) &amp; = &amp; (24.3 \pm 8.0 \pm 2.9 \pm 5.2)^{\circ}.{eqnarray*}\ The values for the $CP$ violating phase in $B^0\to ϕ(1020) K^0_S$ are similar but other properties of the Dalitz plot are quite different for the four solutions. These four solutions have consistent $ϕ^{\rm eff}_1$ values for all three $B$ meson decay channels and none of them deviates significantly from the values measured in $B \to (c\bar{c}) K^0$ decays with the currently available statistics. In addition, we find no significant direct $CP$ violation.
description: submitted to PRD