Charged kaon production in tau decays at LEP

Kaon production in one prong tau decays has been studied using data collected with the DELPHIdetector at the LEP collider. Charged kaons were identified over a large momentum range by the DELPHIbarrel Ring Imaging Cherenkov detector. The following branching ratios have been determined: BR(τ→Kντ)=(0.85±0.18)%, BR(τ→Kντ≥0 neutrals)=(1.54±0.24)%, BR(τ→Kντ≥1 neutrals)=(0.69±0.25)%. The result for the exclusive branching ratio is consistent with the Standard Model prediction based on τ-μ-e universality. In addition, tau decay into K∗− was studied in the channel K∗−→K−π0. The result View the MathMLsource was obtained.