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$\eta (1405)$ MASS

$\pi \pi \gamma$ MODE

INSPIRE   PDGID:

M027M2

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\mathbf{1403}\pm \mathbf{17}$ OUR AVERAGE  Error includes scale factor of 1.8. $1390$ $\pm 12$ $235$ $\pm 91$ AMSLER 2004 B CBAR 0 $\bar{\mathit{p}}$ $\mathit{p}$ $\to$ ${\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}\eta$ $1424$ $\pm 10$ $\pm 11$ 547 BAI 2004 J BES2 $\mathit{J}/\psi$ $\to$ $\gamma \gamma {\pi }^{+}{\pi }^{-}$ • • We do not use the following data for averages, fits, limits, etc. • • $1401$ $\pm 18$ 1, 2 AUGUSTIN 1990 DM2 $\mathit{J}/\psi$ $\to$ ${\pi }^{+}{\pi }^{-}\gamma \gamma$ $1432$ $\pm 8$ 2 COFFMAN 1990 MRK3 $\mathit{J}/\psi$ $\to$ ${\pi }^{+}{\pi }^{-}$2 $\gamma$ 1  Best fit with a single Breit Wigner. 2  This peak in the $\gamma \rho$ channel may not be related to the $\eta (1405)$.

References

AMSLER 2004B EPJ C33 23 Production and Decay of ${\eta }^{{}^{\prime }}(958)$ and $\eta (1440)$ in $\bar{\mathit{p}}\mathit{p}$ Annihilation at Rest BAI 2004J PL B594 47 A Study of $\mathit{J}/\psi$ $\to$ $\gamma \gamma \mathit{V}(\rho ,\varphi$) Decays with the BESII Detector AUGUSTIN 1990 PR D42 10 Radiative Decay of $\mathit{J}/\psi$ into $\eta (1430)$ and Nearby States COFFMAN 1990 PR D41 1410 Study of the Doubly Radiative Decay $\mathit{J}/\psi$ $\to$ $\gamma \gamma {\rho }^0$

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