Search for the doubly charmed baryon Ξ+cc in the Ξ+cπ−π+ final state

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Abstract

A search for the doubly charmed baryon Ξ+ccΞcc+ is performed in the Ξ+cπ−π+Ξc+π−π+ invariant-mass spectrum, where the Ξ+cΞc+ baryon is reconstructed in the pKπ+ final state. The study uses proton-proton collision data collected with the LHCb detector at a centre- of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 5.4 fb1. No significant signal is observed in the invariant-mass range of 3.4–3.8 GeV/c2. Upper limits are set on the ratio of branching fractions multiplied by the production cross-section with respect to the Ξ++ccΞcc++  (Ξ+cΞc+ → pKπ+)π+ decay for different Ξ+ccΞcc+ mass and lifetime hypotheses in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 2.5 to 25 GeV/c. The results from this search are combined with a previously published search for the Ξ+ccΞcc+  Λ+cΛc+Kπ+ decay mode, yielding a maximum local significance of 4.0 standard deviations around the mass of 3620 MeV/c2, including systematic uncertainties. Taking into account the look-elsewhere effect in the 3.5–3.7 GeV/c2 mass window, the combined global significance is 2.9 standard deviations including systematic uncertainties.
Original languageEnglish
Article number107
Number of pages27
JournalJournal of High Energy Physics
Volume2021
Issue number12
DOIs
Publication statusPublished - 16-Dec-2021

Keywords

  • Branching fraction
  • Charm physics
  • Flavor physics
  • Hadron-Hadron scattering (experiments)
  • QCD

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