Observation of Bs->Ds()+Ds()- using e+e- collisions and a determination of the Bs-Bsbar width difference DeltaGamma_s

S. Esen , A. J. Schwartz , I. Adachi , H. Aihara , K. Arinstein , V. Aulchenko , T. Aushev , T. Aziz

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A. M. Bakich V. Balagura E. Barberio A. Bay M. Bischofberger A. Bondar A. Bozek M. Bracko T. E. Browder M.-C. Chang P. Chang A. Chen P. Chen B. G. Cheon C.-C. Chiang Y. Choi J. Dalseno M. Dash Z. Dolezal Z. Drasal A. Drutskoy S. Eidelman P. Goldenzweig B. Golob H. Ha J. Haba T. Hara K. Hayasaka T. Higuchi Y. Hoshi W.-S. Hou Y. B. Hsiung H. J. Hyun T. Iijima K. Inami R. Itoh M. Iwabuchi N. J. Joshi T. Julius J. H. Kang T. Kawasaki H. Kichimi H. J. Kim H. O. Kim J. H. Kim Y. J. Kim K. Kinoshita B. R. Ko P. Kodys S. Korpar P. Krizan P. Krokovny T. Kuhr T. Kumita Y.-J. Kwon S.-H. Kyeong J. S. Lange S.-H. Lee Y. Liu D. Liventsev R. Louvot A. Matyja S. McOnie H. Miyata R. Mizuk G. B. Mohanty E. Nakano M. Nakao H. Nakazawa Z. Natkaniec S. Neubauer S. Nishida O. Nitoh T. Ohshima S. Okuno S. L. Olsen P. Pakhlov C. W. Park H. Park H. K. Park M. Petric L. E. Piilonen M. Rohrken S. Ryu H. Sahoo Y. Sakai O. Schneider C. Schwanda K. Senyo M. E. Sevior M. Shapkin C. P. Shen J.-G. Shiu P. Smerkol E. Solovieva M. Staric K. Sumisawa T. Sumiyoshi Y. Teramoto K. Trabelsi S. Uehara Y. Unno S. Uno P. Urquijo Y. Usov G. Varner K. E. Varvell K. Vervink C. H. Wang M.-Z. Wang P. Wang Y. Watanabe R. Wedd J. Wicht E. Won B. D. Yabsley Y. Yamashita Z. P. Zhang V. Zhilich A. Zupanc

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classification ✦ hep-ex

keywords gammadeltabranchingbs-bsbardecaysdifferenceobservationwidth

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We have made the first observation of Bs->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->Ds(*)+Ds(*)- saturates decays to CP-even final states, the branching fraction determines the ratio \Delta\Gamma_s/cos(\phi), where \Delta\Gamma_s is the difference in widths between the two Bs-Bsbar mass eigenstates, and \phi is a CP-violating weak phase. Taking CP violation to be negligibly small, we obtain \Delta\Gamma_s/\Gamma_s = 0.147^{+0.036}_{-0.030}(stat.)^{+0.044}_{-0.042}(syst.), where \Gamma_s is the mean decay width.

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Observation of Bs->Ds(*)+Ds(*)- using e+e- collisions and a determination of the Bs-Bsbar width difference DeltaGamma_s

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Observation of Bs->Ds()+Ds()- using e+e- collisions and a determination of the Bs-Bsbar width difference DeltaGamma_s