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

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

INSPIRE   JSON  (beta) 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
2004B
 CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$
$1424$ $\pm10$ $\pm11$ 547
BAI
2004J
 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 ${{\mathit \eta}{(1405)}}$.
References