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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: M164

${{\mathit \pi}_{{{1}}}{(1600)}}$ $I^G(J^{PC})$ = $1^-(1^{- +})$

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. Accordingly, the ${{\mathit \pi}_{{{1}}}{(1400)}}$ entries of the previous Reviews have been moved into this section. See the review on "Spectroscopy of Light Meson Resonances."

${{\mathit \pi}_{{{1}}}{(1600)}}$ T-Matrix Pole $\sqrt {s }$   $(1480 - 1680) − {\mit i} (150 - 300)$ MeV

${{\mathit \pi}_{{{1}}}{(1600)}}$ MASS (${{\mathit \eta}}{{\mathit \pi}}$ mode)   $1354 \pm25$ MeV (S = 1.8)

${{\mathit \pi}_{{{1}}}{(1600)}}$ MASS (non-${{\mathit \eta}}{{\mathit \pi}}$ mode)   $1645 {}^{+40}_{-17}$ MeV (S = 1.3)

${{\mathit \pi}_{{{1}}}{(1600)}}$ WIDTH (${{\mathit \eta}}{{\mathit \pi}}$ mode)   $330 \pm35$ MeV

${{\mathit \pi}_{{{1}}}{(1600)}}$ WIDTH (non-${{\mathit \eta}}{{\mathit \pi}}$ mode)   $370 {}^{+50}_{-60}$ MeV

${{\mathit \pi}_{{{1}}}{(1600)}}$ DECAY MODES
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \pi}}{{\mathit \pi}}{{\mathit \pi}}$   seen 795   $\Gamma_{2}$ ${{\mathit \rho}^{0}}{{\mathit \pi}^{-}}$   seen 631   $\Gamma_{3}$ ${{\mathit f}_{{{2}}}{(1270)}}{{\mathit \pi}^{-}}$   not seen 304   $\Gamma_{4}$ ${{\mathit b}_{{{1}}}{(1235)}}{{\mathit \pi}}$   seen 343   $\Gamma_{5}$ ${{\mathit \eta}^{\,'}{(958)}}{{\mathit \pi}^{-}}$   seen 532   $\Gamma_{6}$ ${{\mathit \eta}}{{\mathit \pi}}$   seen 725   $\Gamma_{7}$ ${{\mathit f}_{{{1}}}{(1285)}}{{\mathit \pi}}$   seen 300
FOOTNOTES