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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: M006

${{\mathit f}_{{{1}}}{(1420)}}$ $I^G(J^{PC})$ = $0^+(1^{+ +})$

See the review on "Spectroscopy of Light Meson Resonances."

${{\mathit f}_{{{1}}}{(1420)}}$ MASS $1428.4^{+1.5}_{-1.3}$ MeV (S = 1.8)

${{\mathit f}_{{{1}}}{(1420)}}$ WIDTH $56.7$ $\pm3.3$ MeV (S = 1.3)

${{\mathit f}_{{{1}}}{(1420)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ seen 440   $\Gamma_{2}$ ${{\mathit K}}{{\overline{\mathit K}}^{*}{(892)}}$ + c.c. seen 167   $\Gamma_{3}$ ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \pi}}$ possibly seen 574   $\Gamma_{4}$ ${{\mathit a}_{{{0}}}{(980)}}{{\mathit \pi}}$ 360   $\Gamma_{5}$ ${{\mathit \pi}}{{\mathit \pi}}{{\mathit \rho}}$ 455   $\Gamma_{6}$ 4 ${{\mathit \pi}}$ 649   $\Gamma_{7}$ ${{\mathit \rho}^{0}}{{\mathit \gamma}}$ 504   $\Gamma_{8}$ ${{\mathit \phi}}{{\mathit \gamma}}$ seen 350