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 $\mathit I = 0$ (${{\mathit \eta}}$, ${{\mathit \eta}^{\,'}}$, ${{\mathit h}}$, ${{\mathit h}^{\,'}}$, ${{\mathit \omega}}$, ${{\mathit \phi}}$, ${{\mathit f}}$, ${{\mathit f}^{\,'}}$): ${\mathit {\mathit c}}_{{\mathrm {1}}}$( ${{\mathit u}}{{\overline{\mathit u}}}$ $+$ ${{\mathit d}}{{\overline{\mathit d}}}$ ) $+$ ${\mathit {\mathit c}}_{{\mathrm {2}}}$( ${{\mathit s}}{{\overline{\mathit s}}}$ ) 		INSPIRE   JSON  (beta) PDGID:
M111

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

$I^G(J^{PC})$ = $1^-(1^{- +})$ 
Coupled channel analyses favor the existence of only one broad ${}^{}1{}^{-+}$ isovector state consistent with ${{\mathit \pi}_{{1}}{(1600)}}$ in the $1400 - 1600$ MeV region. See the review on "Spectroscopy of Light Meson Resonances." See also ${{\mathit \pi}_{{1}}{(1600)}}$.
${{\mathit \pi}_{{1}}{(1400)}}$ T-MATRIX POLE $\sqrt {\mathit s }$   $(1405 \pm4 {}^{+15}_{-18}) − {\mit i} (314 \pm14 {}^{+18}_{-69})$ MeV 
 
${{\mathit \pi}_{{1}}{(1400)}}$ MASS   $1354 \pm25$ MeV (S = 1.8)
 
${{\mathit \pi}_{{1}}{(1400)}}$ WIDTH   $330 \pm35$ MeV 
 
$\Gamma_{1}$ ${{\mathit \eta}}{{\mathit \pi}^{0}}$   seen 557
 
$\Gamma_{2}$ ${{\mathit \eta}}{{\mathit \pi}^{-}}$   seen 556
 
$\Gamma_{3}$ ${{\mathit \eta}^{\,'}}{{\mathit \pi}}$   318
 
$\Gamma_{4}$ ${{\mathit \rho}{(770)}}{{\mathit \pi}}$   not seen 442
 
FOOTNOTES