This web page summarizes the results for the first measurement of the relative
branching fractions
Br(B_{s}^{0}
→D_{s}^{±}K^{+}) /
Br(B_{s}^{0}
→D_{s}^{+}π^{−}).
We use 1.2
fb^{−1} of D_{s}(&phi&pi)X data.
The results were approved on May 24, 2007.

We obtain
Br(B_{s}^{0}
→D_{s}^{±}K^{+}) /
Br(B_{s}^{0}
→D_{s}^{+}π^{−})
= 0.107 ± 0.019(stat) ± 0.008(sys). The statistical significance
of the
B_{s}^{0}
→D_{s}^{±}K^{+}
signal is 7.90σ.

Below are the eps and gif versions of all figures meant for downloads.

- dE/dx templates for the D
^{+}X control-sample fit. Optimized for slides (.eps) (.gif) and for papers (.eps) (.gif) - dE/dx templates for the D
^{*+}X control-sample fit. Optimized for slides (.eps) (.gif) and for papers (.eps) (.gif) - dE/dx templates for the D
_{s}^{+}X signal-sample fit. Optimized for slides (.eps) (.gif) and for papers (.eps) (.gif) - Mass fit of candidates from the D
^{+}sideband to determine the shape of the fake-D background in the D^{+}X control-sample fit (.eps)(.gif) - Mass fit of candidates from the D
_{s}^{+}sideband to determine the shape of the fake-D background in the D_{s}^{+}X signal-sample fit (.eps)(.gif) - D
^{+}X control-sample fit, mass projection (.eps)(.gif) - D
^{+}X control-sample fit, dE/dx projection. Optimized for slides (.eps) (.gif) and for papers (.eps) (.gif). Also available for the DK region only (.eps) (.gif) - D
^{*+}X control-sample fit, mass projection (.eps)(.gif) - D
^{*+}X control-sample fit, dE/dx projection. Optimized for slides (.eps) (.gif) and for papers (.eps) (.gif). Also available for the DK region only (.eps) (.gif) - D
_{s}^{+}X signal-sample fit, mass projection (.eps)(.gif) - D
_{s}^{+}X signal-sample fit, dE/dx projection. Optimized for slides (.eps) (.gif) and for papers (.eps) (.gif). Also available for the DK region only (.eps) (.gif)