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arxiv: 0811.2173 · v2 · submitted 2008-11-13 · ✦ hep-ex

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Evidence for the decay B_s⁰ --> D_s^(*)D_s^(*) and a measurement of Delta_Gamma_s^CP/Gamma_s

D0 Collaboration: V. M. Abazov , et al
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classification ✦ hep-ex
keywords gammadeltastatsystaboveassumptionsbackgroundbranching
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We search for the semi-inclusive process B_s^0 --> D_s^(*)D_s^(*) using 2.8 fb^-1 of ppbar collisions at s^(1/2) = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We observe 26.6 +/- 8.4 signal events with a significance above background of 3.2 standard deviations yielding a branching ratio of Br(B_s^0 --> D_s^(*)D_s^(*)) = 0.035 +/- 0.010(stat) +/- 0.011(syst). Under certain theoretical assumptions, these double-charm final states saturate CP-even eigenstates in the B_s^0 decays resulting in a width difference of Delta_Gamma_s^CP/Gamma_s = 0.072 +/- 0.021(stat) +/- 0.022(syst).

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