LIGHT UNFLAVORED MESONS($\mathit S$ = $\mathit C$ = $\mathit B$ = 0) For $\mathit I = 1$ (${{\mathit \pi}}$ , ${{\mathit b}}$ , ${{\mathit \rho}}$ , ${{\mathit a}}$ ): ${\mathit {\mathit u}}$ ${\mathit {\overline{\mathit d}}}$, ( ${\mathit {\mathit u}}$ ${\mathit {\overline{\mathit u}}}−$ ${\mathit {\mathit d}}$ ${\mathit {\overline{\mathit d}}})/\sqrt {2 }$, ${\mathit {\mathit d}}$ ${\mathit {\overline{\mathit u}}}$;for $\mathit I = 0$ (${{\mathit \eta}}$ , ${{\mathit \eta}^{\,'}}$ , ${{\mathit h}}$ , ${{\mathit h}^{\,'}}$ , ${{\mathit \omega}}$ , ${{\mathit \phi}}$ , ${{\mathit f}}$ , ${{\mathit f}^{\,'}}$ ): ${\mathit {\mathit c}}_{{\mathrm {1}}}$( ${{\mathit u}}{{\overline{\mathit u}}}$ $+$ ${{\mathit d}}{{\overline{\mathit d}}}$ ) $+$ ${\mathit {\mathit c}}_{{\mathrm {2}}}$( ${{\mathit s}}{{\overline{\mathit s}}}$ )

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

$I^G(J^{PC})$ = $0^+(0^{- +})$
See also the ${{\mathit \eta}{(1475)}}$ .
${{\mathit \eta}{(1405)}}$ MASS
 Mass $\mathit m$ $1408.8 \pm2.0$ MeV (S = 2.2)
 ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ MODE $1405.8 \pm2.6$ MeV (S = 2.3)
 ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ MODE ( ${{\mathit a}_{{0}}{(980)}}{{\mathit \pi}}$ or direct ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ ) $1413.9 \pm1.7$ MeV (S = 1.1)
 ${{\mathit \pi}}{{\mathit \pi}}{{\mathit \gamma}}$ MODE $1403 \pm17$ MeV (S = 1.8)
 4 ${{\mathit \pi}}$ MODE
 ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ MODE (unresolved)
${{\mathit \eta}{(1405)}}$ WIDTH
 Full width $\Gamma$ $50.1 \pm2.6$ MeV (S = 1.7)
 ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ MODE $52.6 \pm3.2$ MeV (S = 1.3)
 ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ MODE ( ${{\mathit a}_{{0}}{(980)}}{{\mathit \pi}}$ or direct ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ ) $48 \pm4$ MeV (S = 2.1)
 ${{\mathit \pi}}{{\mathit \pi}}{{\mathit \gamma}}$ MODE $89 \pm17$ MeV (S = 1.7)
 4 ${{\mathit \pi}}$ MODE
 ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ MODE (unresolved)
 $\Gamma_{1}$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ seen 424
 $\Gamma_{2}$ ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ seen 562
 $\Gamma_{3}$ ${{\mathit a}_{{0}}{(980)}}{{\mathit \pi}}$ seen 345
 $\Gamma_{4}$ ${{\mathit \eta}}{({\mathit \pi}{\mathit \pi})_{{\mathit S}-{\text{wave}}}}$ seen
 $\Gamma_{5}$ ${{\mathit f}_{{0}}{(980)}}{{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ not seen
 $\Gamma_{6}$ ${{\mathit f}_{{0}}{(980)}}{{\mathit \eta}}$ seen -1
 $\Gamma_{7}$ 4 ${{\mathit \pi}}$ seen 639
 $\Gamma_{8}$ ${{\mathit \rho}}{{\mathit \rho}}$ $<58\%$ CL=100% -1
 $\Gamma_{9}$ ${{\mathit \gamma}}{{\mathit \gamma}}$ 704
 $\Gamma_{10}$ ${{\mathit \rho}^{0}}{{\mathit \gamma}}$ seen 491
 $\Gamma_{11}$ ${{\mathit \phi}}{{\mathit \gamma}}$ 336
 $\Gamma_{12}$ ${{\mathit K}^{*}{(892)}}{{\mathit K}}$ seen 123
 FOOTNOTES