# ${{\boldsymbol \pi}_{{1}}{(1400)}}$ WIDTH INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 330 \pm35}$ OUR AVERAGE
$354$ $\pm64$ $\pm58$ 23.5k
 2007 B
B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit n}}$
$378$ $\pm50$ $\pm50$ 90k
 2004
OBLX ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$
$220$ $\pm90$
 1999
CBAR $0.0$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$
$310$ $\pm50$ ${}^{+50}_{-30}$
 1998 B
CBAR 0.0 ${{\overline{\mathit p}}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \eta}}$
$385$ $\pm40$ ${}^{+65}_{-105}$ 1
 1997
MPS 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$143.2$ $\pm12.5$ 2
 1993
BKEI ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$
$180$ $\pm20$ 3
 1988 B
GAM4 0 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit n}}$
1  Resolution is not unfolded, natural parity exchange, questioned by DZIERBA 2003 .
2  Unnatural parity exchange.
3  Seen in the ${\mathit P}_{\mathrm 0}{\mathrm -wave}$ intensity of the ${{\mathit \eta}}{{\mathit \pi}^{0}}$ system, unnatural parity exchange.
References:
PL B657 27 Confirmation of the $1-{}^{+}{}^{}$ Meson Exotics in the ${{\mathit \eta}}{{\mathit \pi}^{0}}$ System
EPJ C35 21 ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation into Four Charged Pions at Rest and in Flight
PL B446 349 Evidence for a ${{\mathit \pi}}{{\mathit \eta}}$ ${\mathit P}{\mathrm -wave}$ in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilations at Rest into ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$
PL B423 175 Exotic ${{\mathit \eta}}{{\mathit \pi}}$ State in ${{\overline{\mathit p}}}{{\mathit d}}$ Annihilation at Rest into ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit p}}_{spect.}$
PRL 79 1630 Evidence for Exotic Meson Production in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$ at 18 ${\mathrm {GeV/}}\mathit c$
PL B314 246 Study of the ${{\mathit \eta}}{{\mathit \pi}^{-}}$ System in the ${{\mathit \pi}^{-}}{{\mathit p}}$ Reaction at 6.3 ${\mathrm {GeV/}}\mathit c$
PL B205 397 Evidence for a $1-{}^{+}{}^{}$ Exotic Meson