This web page summarizes the results for the first measurement of the relative branching fractions Br(B_s⁰ →D_s^±K⁺) / Br(B_s⁰ →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_s⁰ →D_s^±K⁺) / Br(B_s⁰ →D_s⁺π⁻) = 0.107 ± 0.019(stat) ± 0.008(sys). The statistical significance of the B_s⁰ →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)