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${{\mathit \eta}{(1405)}}$ MASS

${{\mathit \pi}}{{\mathit \pi}}{{\mathit \gamma}}$ MODE

INSPIRE   PDGID:

M027M2

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1403 \pm17}$ OUR AVERAGE  Error includes scale factor of 1.8. $1390$ $\pm12$ $235$ $\pm91$ AMSLER 2004 B CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$ $1424$ $\pm10$ $\pm11$ 547 BAI 2004 J BES2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1401$ $\pm18$ 1, 2 AUGUSTIN 1990 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}}{{\mathit \gamma}}$ $1432$ $\pm8$ 2 COFFMAN 1990 MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$2 ${{\mathit \gamma}}$ 1  Best fit with a single Breit Wigner. 2  This peak in the ${{\mathit \gamma}}{{\mathit \rho}}$ channel may not be related to the ${{\mathit \eta}{(1405)}}$.

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