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 PDGID:
M005

${{\mathit f}_{{{2}}}{(1270)}}$

$I^G(J^{PC})$ = $0^+(2^{+ +})$ 
${{\mathit f}_{{{2}}}{(1270)}}$ T-MATRIX POLE $\sqrt {\mathit s }$   $(1260 - 1283) − {\mit i} (90 - 110)$ MeV 
 
${{\mathit f}_{{{2}}}{(1270)}}$ MASS   $1275.4 \pm0.8$ MeV (S = 1.1)
 
${{\mathit f}_{{{2}}}{(1270)}}$ WIDTH   $186.6 {}^{+2.8}_{-2.2}$ MeV (S = 1.5)
 
Helicity-0/Helicity-2 RATIO IN ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit f}_{{{2}}}{(1270)}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$   $0.037 {}^{+0.160}_{-0.029}$  
 
$\Gamma_{1}$ ${{\mathit \pi}}{{\mathit \pi}}$   $(84.3^{+2.8}_{-1.0})\%$ S=1.2  623
 
$\Gamma_{2}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$   $(7.7^{+1.2}_{-3.1})\%$ S=1.2  563
 
$\Gamma_{3}$ ${{\mathit K}}{{\overline{\mathit K}}}$   $(4.6\pm{0.4})\%$ S=2.7  404
 
$\Gamma_{4}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$   $(2.8\pm{0.4})\%$ S=1.2  559
 
$\Gamma_{5}$ ${{\mathit \eta}}{{\mathit \eta}}$   $(4.0\pm{0.8})\times 10^{-3}$ S=2.1  326
 
$\Gamma_{6}$ 4 ${{\mathit \pi}^{0}}$   $(3.0\pm{1.0})\times 10^{-3}$ 565
 
$\Gamma_{7}$ ${{\mathit \gamma}}{{\mathit \gamma}}$   $(1.42\pm{0.24})\times 10^{-5}$ S=1.4  638
 
$\Gamma_{8}$ ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$   $<8\times 10^{-3}$ CL=95% 478
 
$\Gamma_{9}$ ${{\mathit K}^{0}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$ + c.c.   $<3.4\times 10^{-3}$ CL=95% 293
 
$\Gamma_{10}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$   $<6\times 10^{-10}$ CL=90% 638
 
FOOTNOTES
Constrained Fit information