First observation and branching fraction measurement of the %$ {\Lambda}_b^0\to {D}_s^{-}p %$ decay

Abstract The first observation of the %$ {\Lambda}_b^0\to {D}_s^{-}p %$ decay is presented using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of %$ \sqrt{s} %$ = 13 TeV, corresponding to a total integrated luminosity of 6 $ fb^{−1} $. Using the %$ {\Lambda...
Ausführliche Beschreibung

Abstract The first observation of the %$ {\Lambda}_b^0\to {D}_s^{-}p %$ decay is presented using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of %$ \sqrt{s} %$ = 13 TeV, corresponding to a total integrated luminosity of 6 $ fb^{−1} $. Using the %$ {\Lambda}_b^0\to {\Lambda}_c^{+}{\pi}^{-} %$ decay as the normalisation mode, the branching fraction of the %$ {\Lambda}_b^0\to {D}_s^{-}p %$ decay is measured to be %$ \mathcal{B}\left({\Lambda}_b^0\to {D}_s^{-}p\right)=\left(12.6\pm 0.5\pm 0.3\pm 1.2\right)\times {10}^{-6} %$, where the first uncertainty is statistical, the second systematic and the third due to uncertainties in the branching fractions of the %$ {\Lambda}_b^0\to {\Lambda}_c^{+}{\pi}^{-} %$, %$ {D}_s^{-}\to {K}^{-}{K}^{+}{\pi}^{-} %$ and %$ {\Lambda}_c^{+}\to p{K}^{-}{\pi}^{+} %$ decays. Ausführliche Beschreibung