Measurement of the CP-violation Parameter sin2$ϕ_1$ with a New Tagging Method at the $Υ(5S)$ Resonance
Creators: name: Belle Collaboration
name: Sato, Y.
name: Yamamoto, H.
name: Aihara, H.
name: Asner, D. M.
name: Aulchenko, V.
name: Aushev, T.
name: Aziz, T.
name: Bakich, A. M.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Bischofberger, M.
name: Bondar, A.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Chang, P.
name: Chen, P.
name: Cheon, B. G.
name: Chilikin, K.
name: Chistov, R.
name: Cho, I. -S.
name: Cho, K.
name: Choi, S. -K.
name: Choi, Y.
name: Dalseno, J.
name: Doležal, Z.
name: Drásal, Z.
name: Eidelman, S.
name: Epifanov, D.
name: Fast, J. E.
name: Gaur, V.
name: Gabyshev, N.
name: Goh, Y. M.
name: Golob, B.
name: Haba, J.
name: Hara, T.
name: Hayasaka, K.
name: Hayashii, H.
name: Horii, Y.
name: Hoshi, Y.
name: Hou, W. -S.
name: Hyun, H. J.
name: Ishikawa, A.
name: Itoh, R.
name: Iwabuchi, M.
name: Iwasaki, Y.
name: Iwashita, T.
name: Julius, T.
name: Kapusta, P.
name: Kawasaki, T.
name: Kichimi, H.
name: Kiesling, C.
name: Kim, H. J.
name: Kim, H. O.
name: Kim, J. B.
name: Kim, J. H.
name: Kim, K. T.
name: Kim, M. J.
name: Kim, S. K.
name: Kim, Y. J.
name: Kinoshita, K.
name: Ko, B. R.
name: Kobayashi, N.
name: Kodyš, P.
name: Korpar, S.
name: Križan, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kumar, R.
name: Kumita, T.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Lange, J. S.
name: Lee, S. -H.
name: Li, J.
name: Li, Y.
name: Liu, C.
name: Liu, Z. Q.
name: Louvot, R.
name: McOnie, S.
name: Miyabayashi, K.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, G. B.
name: Moll, A.
name: Muramatsu, N.
name: Nakano, E.
name: Nakao, M.
name: Nakazawa, H.
name: Natkaniec, Z.
name: Nishida, S.
name: Nishimura, K.
name: Nitoh, O.
name: Ogawa, S.
name: Ohshima, T.
name: Okuno, S.
name: Olsen, S. L.
name: Onuki, Y.
name: Ostrowicz, W.
name: Pakhlov, P.
name: Pakhlova, G.
name: Park, C. W.
name: Park, H.
name: Park, H. K.
name: Pedlar, T. K.
name: Petrič, M.
name: Piilonen, L. E.
name: Poluektov, A.
name: Röhrken, M.
name: Ryu, S.
name: Sahoo, H.
name: Sakai, Y.
name: Sanuki, T.
name: Schneider, O.
name: Schwanda, C.
name: Schwartz, A. J.
name: Seidl, R.
name: Senyo, K.
name: Seon, O.
name: Sevior, M. E.
name: Shapkin, M.
name: Shen, C. P.
name: Shibata, T. -A.
name: Shiu, J. -G.
name: Shwartz, B.
name: Sibidanov, A.
name: Simon, F.
name: Smerkol, P.
name: Sohn, Y. -S.
name: Sokolov, A.
name: Solovieva, E.
name: Stanič, S.
name: Starič, M.
name: Stypula, J.
name: Sumihama, M.
name: Sumiyoshi, T.
name: Tanaka, S.
name: Tatishvili, G.
name: Teramoto, Y.
name: Trabelsi, K.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Urquijo, P.
name: Varner, G.
name: Varvell, K. E.
name: Wang, C. H.
name: Wang, M. -Z.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, M.
name: Watanabe, Y.
name: Wicht, J.
name: Won, E.
name: Yabsley, B. D.
name: Yamashita, Y.
name: Yusa, Y.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhulanov, V.
name: Zupanc, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report a measurement of the CP-violation parameter sin2$ϕ_1$ at the $Υ(5S)$ resonance using a new tagging method, called "$B$-$π$ tagging." In $Υ(5S)$ decays containing a neutral $B$ meson, a charged $B$, and a charged pion, the neutral $B$ is reconstructed in the $J/ψK_S^0$ CP-eigenstate decay channel. The initial flavor of the neutral $B$ meson at the moment of the $Υ(5S)$ decay is opposite to that of the charged $B$ and may thus be inferred from the charge of the pion without reconstructing the charged $B$. From the asymmetry between $B$-$π^+$ and $B$-$π^-$ tagged $J/ψK_S^0$ yields, we determine sin2$ϕ_1$ = 0.57 $\pm$ 0.58(stat) $\pm$ 0.06(syst). The results are based on 121 fb$^{-1}$ of data recorded by the Belle detector at the KEKB $e^+ e^-$ collider.
description: 6 pages, 3 figures (submitted to PRL)