$\mathbf {{{\mathit X}{(6900)}}}$ $\mathit I{}^{G}(\mathit J{}^{PC}) = ?{}^{?}(?{}^{??})$

INSPIRE   PDGID:
M300K34
MASS ${\mathrm {(MeV)}}$ WIDTH ${\mathrm {(MeV)}}$ DOCUMENT ID TECN  COMMENT
$ 6886 \pm11 \pm11 $ $168 \pm33 \pm69$ 1
AAIJ
2020AY
 LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit J / \psi}}{{\mathit X}}$
1  Assuming the interference of a Breit-Wigner shape with non-resonant single-parton scattering. Without interference, the mass and width are $6905$ $\pm11$ $\pm7$ and $80$ $\pm19$ $\pm33$ MeV. State incompatible with a ${{\mathit q}}{{\overline{\mathit q}}}$ structure. See the review on "Heavy Non-${{\mathit q}}{{\overline{\mathit q}}}$ Mesons."
References:
AAIJ 2020AY
SCIB 65 1983