# ${{\boldsymbol \eta}}{{\boldsymbol \pi}}{{\boldsymbol \pi}}$ MODE INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 52.6 \pm3.2}$ OUR AVERAGE  Error includes scale factor of 1.3.
$48.3$ $\pm5.2$ 743
 2012 E
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$)
$55.0$ $\pm11.0$ 198
 2012 E
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$)
$52.8$ $\pm7.6$ ${}^{+0.1}_{-7.6}$ 1
 2011 J
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \omega}}$ ( ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ )
$55$ $\pm11$ $900$ $\pm375$
 2004 B
CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$
$55$ $\pm12$ $6.6$ $\pm2.0$k
 2004 B
CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \gamma}}$
$80$ $\pm21$ 9082
 2000 A
MPS 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$
$85$ $\pm18$ 2200
 1997 B
GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$
$47$ $\pm13$ 2
 1992 B
MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$59$ $\pm4$
 1991 C
SPEC 8.95 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$
$53$ $\pm11$ 3
 1990
DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$31$ $\pm7$
 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. • • •
$86$ $\pm10$ 4
 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  From ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ mass distribution - mainly ${{\mathit a}_{{0}}{(980)}}{{\mathit \pi}}$ - no spin$-$parity determination available.
4  Superseded by AMSLER 04B.

${{\mathit \eta}{(1405)}}$ width ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ mode (MeV)
References:
 ABLIKIM 2012E
PRL 108 182001 First Observation of ${{\mathit \eta}{(1405)}}$ Decays into ${{\mathit f}_{{0}}{(980)}}{{\mathit \pi}^{0}}$
 ABLIKIM 2011J
PRL 107 182001 ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Resonant Structure Around 1.8 GeV/$\mathit c{}^{2}$ and ${{\mathit \eta}{(1405)}}$ in ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
 AMSLER 2004B
EPJ C33 23 Production and Decay of ${{\mathit \eta}^{\,'}{(958)}}$ and ${{\mathit \eta}{(1440)}}$ in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation at Rest
 MANAK 2000A
PR D62 012003 Partial-Wave Analysis of the ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ System Produced in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$ at 18 ${\mathrm {GeV/}}\mathit c$
 ALDE 1997B
PAN 60 386 Spin Parity Analysis of ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ System in ${{\mathit \pi}^{-}}{{\mathit p}}$ Charge Exchange Reaction at 100 ${\mathrm {GeV/}}\mathit c$ by Zemach Method
 AMSLER 1995F
PL B358 389 ${{\mathit E}}$ Decays to ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation at Rest
 BOLTON 1992B
PRL 69 1328 Partial Wave Analysis of ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
 FUKUI 1991C
PL B267 293 Study of ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ System in the ${{\mathit \pi}^{-}}{{\mathit p}}$ Charge Exchange Reaction at 8.95 ${\mathrm {GeV/}}\mathit c$
 AUGUSTIN 1990
PR D42 10 Radiative Decay of ${{\mathit J / \psi}}$ into ${{\mathit \eta}{(1430)}}$ and Nearby States
 ANDO 1986
PRL 57 1296 Evidence for Two Pseudoscalar Resonances of ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ System in the ${{\mathit D}{(1285)}}$ and $\mathit E/l$ Regions