Observation ofB s 0→D s( * ) + D s( * ) − Usinge +e −Collisions and a Determination of theB s−B ¯sWidth DifferenceΔΓ 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: Bračko, 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: Doležal, Z.
name: Drásal, 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'Mir
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: Kodyš, P.
name: Korpar, S.
name: Križan, 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: Petrič, M.
name: Piilonen, L. E.
name: Röhrken, 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: Starič, 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: Swinburne
Year: 2024

description: We have made the first observation of Bs0→Ds(*)+Ds(*)- decays using 23.6fb⊃-1 of data recorded by the Belle experiment running on the Υ(5S) resonance. The branching fractions are measured to be B(Bs0→Ds+Ds-)=(1.03-0.32-0.25+0.39+0.26)%, B(Bs0→Ds*±Ds)= (2.75-0.71+0.83±0.69)%, and B(Bs0→Ds*+Ds*-)=(3.08-1.04- 0.86+1.22+0.85)%; the sum is B[Bs0→Ds(*)+Ds(*)-]=(6.85-1.30-1. 80+1.53+1.79)%. Assuming Bs0→Ds(*)+Ds(*)- saturates decays to CP-even final states, the branching fraction determines the ratio ΔΓs/cosφ, where ΔΓs is the difference in widths between the two Bs-B̄s mass eigenstates, and φ is a CP-violating weak phase. Taking CP violation to be negligibly small, we obtain ΔΓs/Γs=0. 147-0.030+0.036(stat)-0.041+0.042(syst), where Γs is the mean decay width.