Observation of the ${\Lambda }_{\mathrm{b}}^0$ $\to$ J/$\psi \Lambda \varphi$ decay in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

The observation of the ${\Lambda }_{\mathrm{b}}^0$ $\to$ J/$\psi \Lambda \varphi$ decay is reported using proton-proton collision data collected at $\sqrt{s}=$ 13 TeV by the CMS experiment at the LHC in 2018, corresponding to an integrated luminosity of 60 fb${}^{-1}$. The ratio of the branching fractions $\mathcal{B}({\Lambda }_{\mathrm{b}}^0$ $\to$ J/$\psi \Lambda \varphi )$ $/$ $\mathcal{B}({\Lambda }_{\mathrm{b}}^0$ $\to$ $\psi \Lambda )$ is measured to be (8.26 $\pm$ 0.90 (stat) $\pm$ 0.68 (syst) $\pm$ 0.11 $(\mathcal{B}))$ $\times$ 10${}^{-2}$, where the first uncertainty is statistical, the second is systematic, and the last uncertainty reflects the uncertainties in the world-average branching fractions of $\varphi$ and $\psi$(2S) decays to the reconstructed final states.

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-19-002 (CMS Public Pages)

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Cited by in corpus (5)

• Dark Matter Annihilation Can Produce a Detectable Antihelium Flux through ${\bar{\Lambda }}_b$ Decays
• The resonances $X(4140)$, $X(4160)$, and $P_{cs}(4459)$ in the decay of ${\Lambda }_b\to J/\psi \Lambda \varphi$
• Observation of the B${}_{\mathrm{s}}^0$ $\to$ X(3872)$\varphi$ decay
• Observation of B${}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ and B${}_{\mathrm{S}}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0$ decays
• Exotic Hadrons in the ${\Lambda }_b\to J/\psi \varphi \Lambda$ Decay