First observation and measurement of the branching fraction for the decay $B^0_s \to D_s^*\mp K^\pm$статья
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Дата последнего поиска статьи во внешних источниках: 18 марта 2016 г.
Аннотация:The first observation of the B0s → D∗∓s K± decay is reported using 3.0 fb−1 of proton-proton collision data collected by the LHCb experiment. The D∗∓s mesons are reconstructed through the decay chain D∗∓s → γ D∓s ( K∓ K± π∓ ). The branching fraction relative to that for B0s → D∗−s π+ decays is measured to be B(B0s → D∗∓sK±)/B(B0s → D∗−sπ+)=0.068±0.005+0.003−0.002, where the first uncertainty is statistical and the second is systematic. Using a recent measurement of B(B0s→D∗−sπ+), the absolute branching fraction of B0s → D∗∓s K± is measured as B(B0s→D∗∓sK±) = ( 16.3 ± 1.2 (stat) +0.7−0.5 (syst) ± 4.8 (norm) ) × 10−5, where the third uncertainty is due to the uncertainty on the branching fraction of the normalisation channel.