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:
M010

${{\mathit a}_{{1}}{(1260)}}$

$I^G(J^{PC})$ = $1^-(1^{+ +})$ 
See also our review under the ${{\mathit a}_{{1}}{(1260)}}$ in PDG 2006 , Journal of Physics G33 1 (2006).
${{\mathit a}_{{1}}{(1260)}}$ T-MATRIX POLE $\sqrt {\mathit s }$   $(1209 \pm4 {}^{+12}_{-9})−{\mit i}(288 \pm6 {}^{+45}_{-10})$ MeV 
 
${{\mathit a}_{{1}}{(1260)}}$ MASS   $1230 \pm40$ MeV 
 
${{\mathit a}_{{1}}{(1260)}}$ WIDTH   $250\text{ to }600 $ MeV 
 
${\mathit D}{\mathrm -wave}/{\mathit S}{\mathrm -wave}$ AMPLITUDE RATIO IN DECAY OF ${{\mathit a}_{{1}}{(1260)}}$ $\rightarrow$ ${{\mathit \rho}}{{\mathit \pi}}$   $-0.062 \pm0.020$  (S = 2.3)
 
$\Gamma_{1}$ 3 ${{\mathit \pi}}$   seen 577
 
$\Gamma_{2}$ ( ${{\mathit \rho}}{{\mathit \pi}}$) $_{\mathit S{\mathrm {-wave}}}$ , ${{\mathit \rho}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen 353
 
$\Gamma_{3}$ ( ${{\mathit \rho}}{{\mathit \pi}}$) $_{\mathit D{\mathrm {-wave}}}$ , ${{\mathit \rho}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen 353
 
$\Gamma_{4}$ ( ${{\mathit \rho}{(1450)}}{{\mathit \pi}}$) $_{\mathit S{\mathrm {-wave}}}$ , ${{\mathit \rho}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen -1
 
$\Gamma_{5}$ ( ${{\mathit \rho}{(1450)}}{{\mathit \pi}}$) $_{\mathit D{\mathrm {-wave}}}$ , ${{\mathit \rho}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen -1
 
$\Gamma_{6}$ ${{\mathit f}_{{0}}{(500)}}{{\mathit \pi}}$ , ${{\mathit f}_{{0}}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen  
 
$\Gamma_{7}$ ${{\mathit f}_{{0}}{(980)}}{{\mathit \pi}}$ , ${{\mathit f}_{{0}}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen 179
 
$\Gamma_{8}$ ${{\mathit f}_{{0}}{(1370)}}{{\mathit \pi}}$ , ${{\mathit f}_{{0}}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen -1
 
$\Gamma_{9}$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit \pi}}$ , ${{\mathit f}_{{2}}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   seen -1
 
$\Gamma_{10}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$   seen 576
 
$\Gamma_{11}$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$   not seen 577
 
$\Gamma_{12}$ ${{\mathit K}}{{\mathit K}}{{\mathit \pi}}$   seen 250
 
$\Gamma_{13}$ ${{\mathit K}^{*}{(892)}}{{\mathit K}}$   seen -1
 
$\Gamma_{14}$ ${{\mathit \pi}}{{\mathit \gamma}}$   seen 608
 
FOOTNOTES