Evidence for decay $B_s^0 \to D_s^{(*)}D_s^{(*)}$ and a measurement of $\Delta\Gamma_s^{CP}/\Gamma_s$
(2009) Physical Review Letters — Vol. 102 (2009)
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- Abstract
- 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 marc: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). This corresponds to the first evidence for a width difference in the B_s^0 system.
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Tanasijczuk, A. J., D0, & et al. (2009). Evidence for decay $B_s^0 \to D_s^{(*)}D_s^{(*)}$ and a measurement of $\Delta\Gamma_s^{CP}/\Gamma_s$. Physical Review Letters, 102. https://doi.org/10.1103/PhysRevLett.102.091801 (Original work published 2009)