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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: M013

${{\mathit f}_{{{2}}}^{\,'}{(1525)}}$ $I^G(J^{PC})$ = $0^+(2^{+ +})$

${{\mathit f}_{{{2}}}^{\,'}{(1525)}}$ MASS [1] $1517.3$ $\pm2.4$ MeV (S = 2.8)

PRODUCED BY PION BEAM

PRODUCED BY ${{\mathit K}^{\pm}}$ BEAM $1518.0$ $\pm2.7$ MeV (S = 2.9)

PRODUCED IN ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ANNIHILATION AND PARTICLE DECAYS $1514$ $\pm4$ MeV (S = 3.6)

PRODUCED IN ${{\overline{\mathit p}}}{{\mathit p}}$ ANNIHILATION $1512$ $\pm4$ MeV

CENTRAL PRODUCTION $1515$ $\pm15$ MeV

PRODUCED IN ${{\mathit e}}{{\mathit p}}$ COLLISIONS $1512$ $\pm3.2$ MeV

${{\mathit f}_{{{2}}}^{\,'}{(1525)}}$ WIDTH [1] $72^{+7}_{-6}$ MeV

PRODUCED BY PION BEAM

PRODUCED BY ${{\mathit K}^{\pm}}$ BEAM $82$ $\pm6$ MeV

PRODUCED IN ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ANNIHILATION AND PARTICLE DECAYS $86$ $\pm4$ MeV (S = 2.4)

PRODUCED IN ${{\overline{\mathit p}}}{{\mathit p}}$ ANNIHILATION $77$ $\pm5$ MeV

CENTRAL PRODUCTION $70$ $\pm25$ MeV

PRODUCED IN ${{\mathit e}}{{\mathit p}}$ COLLISIONS $83$ $\pm10$ MeV

${{\mathit f}_{{{2}}}^{\,'}{(1525)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit K}}{{\overline{\mathit K}}}$ ($88.8$ $\pm2.2$ ) $\%$ 576   $\Gamma_{2}$ ${{\mathit \eta}}{{\mathit \eta}}$ ($10.3$ $\pm2.2$ ) $\%$ 525   $\Gamma_{3}$ ${{\mathit \pi}}{{\mathit \pi}}$ ($8.2$ $\pm1.5$) $ \times 10^{-3}$ 747   $\Gamma_{4}$ ${{\mathit K}}{{\overline{\mathit K}}^{*}{(892)}}$ + c.c. 299   $\Gamma_{5}$ ${{\mathit \pi}}{{\mathit K}}{{\overline{\mathit K}}}$ 509   $\Gamma_{6}$ ${{\mathit \pi}}{{\mathit \pi}}{{\mathit \eta}}$ 628   $\Gamma_{7}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ 693   $\Gamma_{8}$ ${{\mathit \gamma}}{{\mathit \gamma}}$ ($1.12$ $\pm0.15$) $ \times 10^{-6}$ 759

[1] Our estimate. See the Particle Listings for details.

Constrained Fit information