Observation of Bs-&gt;Ds(*)+Ds(*)- using e+e- collisions and a determination of the Bs-Bsbar width difference ΔΓ_s
Creators: name: Esen, S.
name: Schwartz, A. J.
name: Adachi, I.
name: Aihara, H.
name: Arinstein, K.
name: Aulchenko, V.
name: Aushev, T.
name: Aziz, T.
name: Bakich, A. M.
name: Balagura, V.
name: Barberio, E.
name: Bay, A.
name: Bischofberger, M.
name: Bondar, A.
name: Bozek, A.
name: Bracko, M.
name: Browder, T. E.
name: Chang, M. -C.
name: Chang, P.
name: Chen, A.
name: Chen, P.
name: Cheon, B. G.
name: Chiang, C. -C.
name: Choi, Y.
name: Dalseno, J.
name: Dash, M.
name: Dolezal, Z.
name: Drasal, Z.
name: Drutskoy, A.
name: Eidelman, S.
name: Goldenzweig, P.
name: Golob, B.
name: Ha, H.
name: Haba, J.
name: Hara, T.
name: Hayasaka, K.
name: Higuchi, T.
name: Hoshi, Y.
name: Hou, W. -S.
name: Hsiung, Y. B.
name: Hyun, H. J.
name: Iijima, T.
name: Inami, K.
name: Itoh, R.
name: Iwabuchi, M.
name: Joshi, N. J.
name: Julius, T.
name: Kang, J. H.
name: Kawasaki, T.
name: Kichimi, H.
name: Kim, H. J.
name: Kim, H. O.
name: Kim, J. H.
name: Kim, Y. J.
name: Kinoshita, K.
name: Ko, B. R.
name: Kodys, P.
name: Korpar, S.
name: Krizan, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kumita, T.
name: Kwon, Y. -J.
name: Kyeong, S. -H.
name: Lange, J. S.
name: Lee, S. -H.
name: Liu, Y.
name: Liventsev, D.
name: Louvot, R.
name: Matyja, A.
name: McOnie, S.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, G. B.
name: Nakano, E.
name: Nakao, M.
name: Nakazawa, H.
name: Natkaniec, Z.
name: Neubauer, S.
name: Nishida, S.
name: Nitoh, O.
name: Ohshima, T.
name: Okuno, S.
name: Olsen, S. L.
name: Pakhlov, P.
name: Park, C. W.
name: Park, H.
name: Park, H. K.
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: Senyo, K.
name: Sevior, M. E.
name: Shapkin, M.
name: Shen, C. P.
name: Shiu, J. -G.
name: Smerkol, P.
name: Solovieva, E.
name: Staric, M.
name: Sumisawa, K.
name: Sumiyoshi, T.
name: Teramoto, Y.
name: Trabelsi, K.
name: Uehara, S.
name: Unno, Y.
name: Uno, S.
name: Urquijo, P.
name: Usov, Y.
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: Wedd, R.
name: Wicht, J.
name: Won, E.
name: Yabsley, B. D.
name: Yamashita, Y.
name: Zhang, Z. P.
name: Zhilich, V.
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 have made the first observation of Bs-&gt;Ds(*)+Ds(*)- decays using 23.6 fb-1 of data recorded by the Belle experiment running on the Upsilon(5S) resonance. The branching fractions are measured to be B(B^0_s\ra D^+_s D^-_s) = (1.0\,^{+0.4}_{-0.3}\,^{+0.3}_{-0.2})%, B(B^0_s\ra D^{*\pm}_s D^{\mp}_s) = (2.8\,^{+0.8}_{-0.7}\,\pm 0.7)%, and B(B^0_s\ra D^{*+}_s D^{*-}_s) = (3.1\,^{+1.2}_{-1.0}\,\pm 0.8)%; the sum is B(B^0_s\ra D^{(*)+}_s D^{(*)-}_s) = (6.9\,^{+1.5}_{-1.3}\,\pm 1.9)%. Assuming Bs-&gt;Ds(*)+Ds(*)- saturates decays to CP-even final states, the branching fraction determines the ratio ΔΓ_s/cos(ϕ), where ΔΓ_s is the difference in widths between the two Bs-Bsbar mass eigenstates, and ϕis a CP-violating weak phase. Taking CP violation to be negligibly small, we obtain ΔΓ_s/Γ_s = 0.147^{+0.036}_{-0.030}(stat.)^{+0.044}_{-0.042}(syst.), where Γ_s is the mean decay width.
description: 13 pages, 2 figures, 2 tables. v2: text added for clarification, version published in Phys. Rev. Letters