#### $\mathbf {{{\boldsymbol X}{(1750)}}}$ $\boldsymbol I\boldsymbol G(\boldsymbol J{}^{PC}) = ?{}^{?}(1{}^{--})$

MASS ${\mathrm {(MeV)}}$ WIDTH ${\mathrm {(MeV)}}$ DOCUMENT ID TECN  COMMENT
$1784 \pm12 {}^{+0}_{-27}$ 106 +22-19 +8-36 1
 2020 F
BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}}$
$1753.5 \pm1.5 \pm2.3$ 122.2+-6.2+-8.0
 2002 K
FOCS $20 - 160$ ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit p}}$
 1 Seen in ${{\mathit \psi}{(2S)}}$ decay with branching ratio ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit X}}{{\mathit \eta}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}}$ = ($4.8$ $\pm1.0$ $\pm2.6$) $\times 10^{-6}$.
References:
 ABLIKIM 2020F
PR D101 032008 Partial wave analysis of $\psi(3686)\to K^{+}K^{-}\eta$
PL B545 50 Observation of a 1750-MeV/$\mathit c{}^{2}$ Enhancement in the Diffractive Photoproduction of ${{\mathit K}^{+}}{{\mathit K}^{-}}$