pdgLive Home   >   LIGHT UNFLAVORED MESONS ($\mathit S$ = $\mathit C$ = $\mathit B$ = 0)   >   ${{\mathit a}_{{{1}}}{(1640)}}$   >   ${{\mathit a}_{{{1}}}{(1640)}}$ MASS

${{\mathit a}_{{{1}}}{(1640)}}$ MASS

INSPIRE   PDGID:

M161M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1655 \pm16}$ OUR AVERAGE  Error includes scale factor of 1.2. $1700$ ${}^{+35}_{-130}$ 46M 1 AGHASYAN 2018 B COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1691$ $\pm18$ $\pm30$ DARGENT 2017 RVUE ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}$ $1630$ $\pm20$ 35k 2 BAKER 2003 SPEC ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $1714$ $\pm9$ $\pm36$ CHUNG 2002 B852 18.3 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1640$ $\pm12$ $\pm30$ BAKER 1999 SPEC $1.94$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 4 ${{\mathit \pi}^{0}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1670$ $\pm90$ BELLINI 1985 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit A}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit A}}$ 1  Statistical error negligible. 2  Using the ${{\mathit a}_{{{1}}}{(1260)}}$ mass and width results of BOWLER 1988.

References