paper

First observation of the $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{-} K^{+} K^{-}$ decay and search for pentaquarks in the $I^_{c}^{+} D_{s}^{-}$ system

arXiv:2507.10713 · doi:10.1103/b28d-z2xc

Abstract

The $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{-} K^{+} K^{-}$ decay is observed for the first time using the data sample from proton-proton collisions recorded at a center-of-mass energy of $13 TeV$ with the LHCb detector, corresponding to an integrated luminosity of $6 fb^{- 1}$ . The ratio of branching fraction to that of $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{-}$ decays is measured as $0.0141 \pm 0.0019 \pm 0.0012$ , where the first uncertainty is statistical and the second systematic. A search for hidden-charm pentaquarks with strangeness is performed in the $I^_{c}^{+} D_{s}^{-}$ system. No evidence is found, and upper limits on the production ratio of $P_{c c ˉ s} (4338)^{0}$ and $P_{c c ˉ s} (4459)^{0}$ pentaquarks relative to the $I^_{c}^{+} D_{s}^{-}$ final state are set at the $95%$ confidence level as $0.12$ and $0.20$ , respectively.

All figures and tables, along with any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/4485

First observation of the I^b0​→I^c+​Ds−​K+K− decay and search for pentaquarks in the I^c+​Ds−​ system

Abstract

First observation of the $I^_{b}^{0} \to I^_{c}^{+} D_{s}^{-} K^{+} K^{-}$ decay and search for pentaquarks in the $I^_{c}^{+} D_{s}^{-}$ system