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

INSPIRE   PDGID:

M135M

VALUE (MeV) DOCUMENT ID TECN  COMMENT $\bf{ 1936 \pm12}$ OUR AVERAGE  Error includes scale factor of 1.3.  See the ideogram below. $1940$ $\pm50$ BAI 2000 A BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) $1980$ $\pm22$ 1 BARBERIS 2000 C 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$4 ${{\mathit \pi}}$ $1940$ $\pm22$ 2 BARBERIS 2000 C 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2 ${{\mathit \pi}}$2 ${{\mathit \pi}^{0}}$ $1960$ $\pm30$ BARBERIS 1997 B OMEG 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) $1918$ $\pm12$ ANTINORI 1995 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. • • $2038$ ${}^{+13}_{-11}$ ${}^{+12}_{-73}$ 3 UEHARA 2009 BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $1930$ $\pm25$ 4 BINON 2005 GAMS 33 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit n}}$ $1980$ $\pm2$ $\pm14$ ABE 2004 BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $2010$ $\pm25$ ANISOVICH 2000 J SPEC $1980$ $\pm50$ ANISOVICH 1999 B SPEC $1.35 - 1.94$ ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$ $\sim$$1990$ 5 OAKDEN 1994 RVUE $0.36 - 1.55$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ $1950$ $\pm15$ 6 ASTON 1991 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.

${{\mathit f}_{{{2}}}{(1950)}}$ mass (MeV)

References