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

MASS ${\mathrm {(MeV)}}$ WIDTH ${\mathrm {(MeV)}}$ DOCUMENT ID TECN  COMMENT
$6886 \pm11 \pm11$ 168 +-33 +-69 1
 2020 AY
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