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${{\mathit T}_{{{c c {{\overline{\mathit c}}} {{\overline{\mathit c}}}}}}{(6900)}^{0}}$ MASS

INSPIRE   PDGID:

M268M

VALUE (MeV) DOCUMENT ID TECN  COMMENT $\bf{ 6899 \pm12}$ OUR AVERAGE  Error includes scale factor of 1.1. $6910$ $\pm10$ $\pm10$ 1 AAD 2023 BL ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit J / \psi}}{{\mathit X}}$ $6886$ $\pm11$ $\pm11$ 2 AAIJ 2020 AY LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit J / \psi}}{{\mathit X}}$ • • We do not use the following data for averages, fits, limits, etc. • • $6960$ $\pm50$ $\pm30$ 3 AAD 2023 BL ATLS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \psi}{(2S)}}{{\mathit X}}$ 1  In a model with two resonances, one describing the broad structure above threshold (mass $6650$ $\pm20$ ${}^{+30}_{-20}$ MeV, width $440$ $\pm50$ ${}^{+60}_{-50}$ MeV) interfering with single parton scattering, and a non-interfering ${{\mathit T}_{{{c c {{\overline{\mathit c}}} {{\overline{\mathit c}}}}}}{(6900)}}$. 2  In a model where the broad structure above threshold interferes with non-resonant single parton scattering. Without interference the mass is $6905$ $\pm11$ $\pm7$ MeV. 3  Assuming a single resonance (could be another state). A 3$\sigma $ signal is observed for an additional resonance with mass $7220$ $\pm30$ ${}^{+10}_{-40}$ MeV and width $90$ $\pm60$ ${}^{+60}_{-50}$ MeV.

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