Observation of the Λ<SUP>0</SUP><i><sub>b</sub></i> → Λ<SUP>+</SUP><i><sub>c</sub>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP>π<SUP>-</SUP> decay



Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 966 more authors) (2021) Observation of the Λ<SUP>0</SUP><i><sub>b</sub></i> → Λ<SUP>+</SUP><i><sub>c</sub>K</i><SUP>+</SUP><i>K</i><SUP>-</SUP>π<SUP>-</SUP> decay. PHYSICS LETTERS B, 815. 136172-.

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Abstract

The $\varLambda^0_b \to \varLambda^+_c K^+ K^- \pi^-$ decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of $\sqrt{s}=7$ and 8 $\rm{TeV}$ collected by the $\mbox{LHCb}$ detector, corresponding to an integrated luminosity of $3{\rm{fb}^{-1}}$. The ratio of branching fractions between the $\varLambda^0_b \to \varLambda^+_c K^+ K^- \pi^-$ and the $\varLambda^{0}_{b}\to\varLambda^{+}_{c}D^{-}_{s}$ decays is measured to be \begin{equation*} \frac{\mathcal{B} ( \varLambda^0_b \to \varLambda^+_c K^+ K^- \pi^-) } {\mathcal{B} ( \varLambda^0_b \to \varLambda^+_c D^-_s)} = (9.26 \pm 0.29 \pm 0.46 \pm 0.26)\times10^{-2}, \end{equation*} where the first uncertainty is statistical, the second systematic and the third is due to the knowledge of the $D^-_s \to K^+ K^- \pi^-$ branching fraction. No structure on the invariant mass distribution of the $\varLambda^+_c K^+$ system is found, consistent with no open-charm pentaquark signature.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-028.html
Uncontrolled Keywords: hep-ex, hep-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2021 08:49
Last Modified: 14 Mar 2024 23:05
DOI: 10.1016/j.physletb.2021.136172
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3134991