Overview
- The signal appears as a roughly 915‑event peak at an invariant mass of 3619.97 ± 0.83 MeV/c², about four times a proton’s mass.
- The observation exceeds the particle‑physics discovery bar with a statistical significance of 7 sigma.
- Results were presented at the Rencontres de Moriond conference, with a full scientific publication expected.
- The Ξcc⁺ (ccd) is the isospin partner of LHCb’s 2017 Ξcc⁺⁺ (ccu) and helps resolve earlier, conflicting SELEX-era claims.
- The measurement provides new tests for quantum chromodynamics and demonstrates the sensitivity of LHCb’s 2023 upgrade to rare hadrons.