CMS-PAS-BPH-22-002 | ||
Observation of the $ \Lambda^{0}_{\mathrm{b}} \to \mathrm{J}/{\psi}\,\Xi^{-}\,\mathrm{K}^{+} $ decay | ||
CMS Collaboration | ||
21 May 2023 | ||
Abstract: Using pp collision data corresponding to an integrated luminosity of about 140 fb$ ^{-1} $ collected by the CMS experiment at $ \sqrt{s}= $ 13 TeV in 2016--2018, the $ \Lambda^{0}_{\mathrm{b}} \to \mathrm{J}/{\psi}\,\Xi^{-}\,\mathrm{K}^{+} $ decay is observed for the first time with a significance exceeding 5 standard deviations. The relative branching fraction, with respect to the $ \Lambda^{0}_{\mathrm{b}} \to \psi(\mathrm{2S})\,\Lambda $ decay, is measured to be $ \mathcal{B}(\Lambda^{0}_{\mathrm{b}} \to \mathrm{J}/{\psi}\,\Xi^{-}\,\mathrm{K}^{+})/\mathcal{B}(\Lambda^{0}_{\mathrm{b}} \to \psi(\mathrm{2S})\,\Lambda) = $ [ 2.5 $ \pm $ 0.8 $ \pm $ 0.9 ]%, where the first uncertainty is statistical and the second one is systematic. | ||
Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to EPJC. The superseded preliminary plots can be found here. |
Compact Muon Solenoid LHC, CERN |