pdgLive Home   >   LIGHT UNFLAVORED MESONS ($\mathit S$ = $\mathit C$ = $\mathit B$ = 0)   >   ${{\mathit f}_{{{2}}}{(1950)}}$   >   ${{\mathit f}_{{{2}}}{(1950)}}$ WIDTH

${{\mathit f}_{{{2}}}{(1950)}}$ WIDTH

INSPIRE   JSON  (beta) PDGID:

M135W

VALUE (MeV) DOCUMENT ID TECN  COMMENT $\bf{ 464 \pm24}$ OUR AVERAGE $380$ ${}^{+120}_{-90}$ BAI 00 A   BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) $520$ $\pm50$ 1 BARBERIS 00 C   450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$4 ${{\mathit \pi}}$ $485$ $\pm55$ 2 BARBERIS 00 C   450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$4 ${{\mathit \pi}}$ $460$ $\pm40$ BARBERIS 99 B   OMEG 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) $390$ $\pm60$ ANTINORI 99   OMEG 300,450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) • • We do not use the following data for averages, fits, limits, etc. • • $441$ ${}^{+27}_{-25}$ ${}^{+28}_{-192}$ 3 UEHARA 00   BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $450$ $\pm50$ 4 BINON 00   GAMS 33 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit n}}$ $297$ $\pm12$ $\pm6$ ABE 00   BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $495$ $\pm35$ ANISOVICH 00 J   SPEC $500$ $\pm100$ ANISOVICH 99 B   SPEC $1.35 - 1.94$ ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$ $\sim$$100$ 5 OAKDEN 99   RVUE $0.36 - 1.55$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ $250$ $\pm50$ 6 ASTON 99   LASS 11 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}{{\mathit \pi}}$ 1  Decaying into ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$. 2  Decaying into 2(${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$). 3  Taking into account ${{\mathit f}_{{{4}}}{(2050)}}$. 4  First solution, PWA is ambiguous. 5  From solution B of amplitude analysis of data on ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$. See however KLOET 1996 who fit ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ only and find waves only up to $\mathit J = 3$ to be important but not significantly resonant. 6  Cannot determine spin to be 2.

References