First Measurement of Inclusive B -&gt; X_s eta Decays
Creators: name: Belle Collaboration
name: Nishimura, K.
name: Browder, T. E.
name: Adachi, I.
name: Aihara, H.
name: Arinstein, K.
name: Aushev, T.
name: Bakich, A. M.
name: Balagura, V.
name: Barberio, E.
name: Belous, K.
name: Bhardwaj, V.
name: Bischofberger, M.
name: Bondar, A.
name: Bozek, A.
name: Bracko, M.
name: Chang, M. -C.
name: Chao, Y.
name: Chen, A.
name: Chen, K. -F.
name: Chen, P.
name: Cheon, B. G.
name: Chiang, C. -C.
name: Cho, I. -S.
name: Choi, Y.
name: Dalseno, J.
name: Danilov, M.
name: Dolezal, Z.
name: Drutskoy, A.
name: Eidelman, S.
name: Gabyshev, N.
name: Golob, B.
name: Ha, H.
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: Iijima, T.
name: Inami, K.
name: Itoh, R.
name: Iwabuchi, M.
name: Iwasaki, Y.
name: Joshi, N. J.
name: Julius, T.
name: Kang, J. H.
name: Kapusta, P.
name: Kawai, H.
name: Kawasaki, T.
name: Kichimi, H.
name: Kiesling, C.
name: Kim, H. J.
name: Kim, H. O.
name: Kim, M. J.
name: Kim, Y. J.
name: Kinoshita, K.
name: Ko, B. R.
name: Kodys, P.
name: Korpar, S.
name: Krizan, P.
name: Kumita, T.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Kyeong, S. -H.
name: Lange, J. S.
name: Lee, M. J.
name: Lee, S. -H.
name: Li, J.
name: Liu, C.
name: Liu, Y.
name: Liventsev, D.
name: Louvot, R.
name: Matyja, A.
name: McOnie, S.
name: Miyabayashi, K.
name: Miyata, H.
name: Miyazaki, Y.
name: Mohanty, G. B.
name: Mori, T.
name: Nakano, E.
name: Nakao, M.
name: Natkaniec, Z.
name: Nishida, S.
name: Ogawa, S.
name: Ohshima, T.
name: Olsen, S. L.
name: Ostrowicz, W.
name: Pakhlova, G.
name: Park, C. W.
name: Park, H.
name: Park, H. K.
name: Park, K. S.
name: Pestotnik, R.
name: Petric, M.
name: Piilonen, L. E.
name: Rohrken, M.
name: Ryu, S.
name: Sahoo, H.
name: Sakai, Y.
name: Schneider, O.
name: Schwanda, C.
name: Schwartz, A. J.
name: Senyo, K.
name: Seon, O.
name: Sevior, M. E.
name: Shapkin, M.
name: Shen, C. P.
name: Shiu, J. -G.
name: Simon, F.
name: Smerkol, P.
name: Sokolov, A.
name: Solovieva, E.
name: Staric, M.
name: Sumiyoshi, T.
name: Suzuki, S.
name: Teramoto, Y.
name: Trabelsi, K.
name: Uehara, S.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Varner, G.
name: Varvell, K. E.
name: Vervink, K.
name: Wang, C. H.
name: Wang, M. -Z.
name: Wang, P.
name: Watanabe, Y.
name: Wicht, J.
name: Williams, K. M.
name: Won, E.
name: Yamashita, Y.
name: Yamauchi, M.
name: Zhang, C. C.
name: Zhang, Z. P.
name: Zhou, P.
name: Zhulanov, V.
name: Zivko, T.
name: Zupanc, A.
name: Zyukova, O.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report a first measurement of inclusive B -&gt; X_s eta decays, where X_s is a charmless state with unit strangeness. The measurement is based on a pseudo-inclusive reconstruction technique and uses a sample of 657 x 10^6 BB-bar pairs accumulated with the Belle detector at the KEKB e^+e^- collider. For M_{X_s} &lt; 2.6 GeV/c^2, we measure a branching fraction of (26.1 +/- 3.0 (stat) +1.9 -2.1 (syst) +4.0 -7.1 (model)) x 10^-5 and a direct CP asymmetry of A_{CP} = -0.13 +/- 0.04 +0.02 -0.03. Over half of the signal occurs in the range M_{X_s} &gt; 1.8 GeV/c^2.
description: 6 pages, 1 figure, 1 table, submitted to Physical Review Letters