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

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

INSPIRE   JSON  (beta) PDGID:
M027W1
M027W1
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 51.1 {}^{+2.8}_{-2.1}}$ OUR AVERAGE  Error includes scale factor of 1.3.  See the ideogram below.
$46$ ${}^{+1.8}_{-2.0}$ ${}^{+4.2}_{-0.0}$ 1
ABLIKIM
2025AB
 
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$
$48.3$ $\pm5.2$ 743
ABLIKIM
2012E
 
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$)
$55.0$ $\pm11.0$ 198
ABLIKIM
2012E
 
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$)
$52.8$ $\pm7.6$ ${}^{+0.1}_{-7.6}$ 2
ABLIKIM
2011J
 
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \omega}}({{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$55$ $\pm11$ 900
AMSLER
2004B
 
CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$
$55$ $\pm12$ 6.6k
AMSLER
2004B
 
CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \gamma}}$
$80$ $\pm21$ 9.0k
MANAK
2000A
 
MPS 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$
$85$ $\pm18$ 2.2k
ALDE
1997B
 
GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$
$47$ $\pm13$ 3
BOLTON
1992B
 
MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$59$ $\pm4$
FUKUI
1991C
 
SPEC 8.95 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$
$53$ $\pm11$ 4
AUGUSTIN
1990
 
DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$31$ $\pm7$
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. • •
$79.0$ $\pm16.0$ 195
ABLIKIM
2019BA
 
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}$
$86$ $\pm10$ 5
AMSLER
1995F
 
CBAR 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$
1  ABLIKIM 2025AB measured ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}{(1405)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ $/$ ${}^{}0{}^{++}$ $\mathit PHSP$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$. Here ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ $/$ ${}^{}0{}^{++}$ $\mathit PHSP$ indicates an intermediate state which could be either ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit f}_{{{0}}}{(980)}}$ or ${{\mathit \gamma}}{{\mathit \pi}^{0}}{}^{}0{}^{++}$ phase space.
2  The selected process is ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit a}_{{{0}}}{(980)}}{{\mathit \pi}}$.
3  From fit to the ${{\mathit a}_{{{0}}}{(980)}}{{\mathit \pi}}{}^{}0{}^{-+}$ partial wave.
4  From ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ mass distribution - mainly ${{\mathit a}_{{{0}}}{(980)}}{{\mathit \pi}}$ - no spin$-$parity determination available.
5  Superseded by AMSLER 04B.

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