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

MASS ${\mathrm {(MeV)}}$

WIDTH ${\mathrm {(MeV)}}$

DOCUMENT ID

TECN

COMMENT

$ 1576 {}^{+49}_{-55} {}^{+98}_{-91} $

818 +22-23 +64-133

ABLIKIM

2006

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 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$