# $\mathbf {{{\boldsymbol X}{(1575)}}}$ $\boldsymbol I\boldsymbol G(\boldsymbol J{}^{PC}) = ?{}^{?}(1{}^{--})$ INSPIRE search

MASS ${\mathrm {(MeV)}}$ WIDTH ${\mathrm {(MeV)}}$ DOCUMENT ID TECN  COMMENT
$1576 {}^{+49}_{-55} {}^{+98}_{-91}$ 818 +22-23 +64-133 1
 2006 S
BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$
1  A broad peak observed at ${{\mathit K}^{+}}{{\mathit K}^{-}}$ invariant mass. Mass and width above are its pole position. The observed branching ratio is B( ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit X}}{{\mathit \pi}^{0}}$ ) B( ${{\mathit X}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$ ) = ($8.5$ $\pm0.6$ ${}^{+2.7}_{-3.6}$) $\times 10^{-4}$.
References:
 ABLIKIM 2006S
PRL 97 142002 Observation of a Broad $1-{}^{-}{}^{}$ Resonant Structure around 1.5 ${\mathrm {GeV/}}\mathit c{}^{2}$ in the ${{\mathit K}^{+}}{{\mathit K}^{-}}$ Mass Spectrum in ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$