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

${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ MODE

INSPIRE   PDGID:

M027M1

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1405.8 \pm2.6}$ OUR AVERAGE  Error includes scale factor of 2.3.  See the ideogram below. $1409.0$ $\pm1.7$ 743 ABLIKIM 2012 E BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$) $1407.0$ $\pm3.5$ 198 ABLIKIM 2012 E BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$) $1399.8$ $\pm2.2$ ${}^{+2.8}_{-0.1}$ 1 ABLIKIM 2011 J BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \omega}}({{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) $1392$ $\pm14$ $900$ $\pm375$ AMSLER 2004 B CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$ $1394$ $\pm8$ $6.6$ $\pm2.0$k AMSLER 2004 B CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$ $1404$ $\pm6$ 9082 MANAK 2000 A MPS 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$ $1424$ $\pm6$ 2200 ALDE 1997 B GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$ $1400$ $\pm6$ 2 BOLTON 1992 B MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1388$ $\pm4$ FUKUI 1991 C SPEC 8.95 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$ $1398$ $\pm6$ 261 3 AUGUSTIN 1990 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1420$ $\pm5$ ANDO 1986 SPEC 8 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1404.0$ $\pm11.0$ 195 ABLIKIM 2019 BA BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}$ $1385$ $\pm7$ BAI 1999 BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1409$ $\pm3$ 4 AMSLER 1995 F CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$ 1  The selected process is ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit a}_{{{0}}}{(980)}}{{\mathit \pi}}$. 2  From fit to the ${{\mathit a}_{{{0}}}{(980)}}{{\mathit \pi}}{}^{}0{}^{-+}$ partial wave. 3  Best fit with a single Breit Wigner. 4  Superseded by AMSLER 04B.

${{\mathit \eta}{(1405)}}$ mass, ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ mode (MeV)

References

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