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${{\mathit \pi}_{{1}}{(1400)}}$ MASS

INSPIRE   PDGID:

M111M

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT $\bf{ 1354 \pm25}$ OUR AVERAGE  Error includes scale factor of 1.8.  See the ideogram below. $1257$ $\pm20$ $\pm25$ 23.5k ADAMS 2007 B B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit n}}$ $1384$ $\pm20$ $\pm35$ 90k SALVINI 2004 OBLX ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$ $1360$ $\pm25$ ABELE 1999 CBAR $0.0$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$ $1400$ $\pm20$ $\pm20$ ABELE 1998 B CBAR 0.0 ${{\overline{\mathit p}}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \eta}}$ $1370$ $\pm16$ ${}^{+50}_{-30}$ 1 THOMPSON 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. • • $1323.1$ $\pm4.6$ 2 AOYAGI 1993 BKEI ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1406$ $\pm20$ 3 ALDE 1988 B GAM4 0 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit n}}$ 1  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.

${{\mathit \pi}_{{1}}{(1400)}}$ MASS (MeV)

References:

ADAMS 2007B PL B657 27 Confirmation of the $1-{}^{+}{}^{}$ Meson Exotics in the ${{\mathit \eta}}{{\mathit \pi}^{0}}$ System SALVINI 2004 EPJ C35 21 ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation into Four Charged Pions at Rest and in Flight ABELE 1999 PL B446 349 Evidence for a ${{\mathit \pi}}{{\mathit \eta}}$ ${\mathit P}{\mathrm -wave}$ in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilations at Rest into ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$ ABELE 1998B PL B423 175 Exotic ${{\mathit \eta}}{{\mathit \pi}}$ State in ${{\overline{\mathit p}}}{{\mathit d}}$ Annihilation at Rest into ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit p}}_{spect.}$ THOMPSON 1997 PRL 79 1630 Evidence for Exotic Meson Production in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$ at 18 ${\mathrm {GeV/}}\mathit c$ AOYAGI 1993 PL B314 246 Study of the ${{\mathit \eta}}{{\mathit \pi}^{-}}$ System in the ${{\mathit \pi}^{-}}{{\mathit p}}$ Reaction at 6.3 ${\mathrm {GeV/}}\mathit c$ ALDE 1988B PL B205 397 Evidence for a $1-{}^{+}{}^{}$ Exotic Meson