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${{\mathit f}_{{{4}}}{(2050)}}$ MASS

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M016M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 2018 \pm11}$ OUR AVERAGE  Error includes scale factor of 2.1.  See the ideogram below. $1960$ $\pm15$ AMELIN 2006 VES 36 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \omega}}{{\mathit n}}$ $2005$ $\pm10$ 1 BINON 2005 GAMS 33 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit n}}$ $1998$ $\pm15$ ALDE 1998 GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$ $2060$ $\pm20$ ALDE 1990 GAM2 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \omega}}{{\mathit n}}$ $2038$ $\pm30$ AUGUSTIN 1987 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $2086$ $\pm15$ BALTRUSAITIS 1987 MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $2000$ $\pm60$ ALDE 1986 D GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \eta}}$ $2020$ $\pm20$ 40k 2 BINON 1984 B GAM2 38 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}^{0}}$ $2015$ $\pm28$ 3 CASON 1982 STRC 8 ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}^{++}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $2031$ ${}^{+25}_{-36}$ ETKIN 1982 B MPS 23 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit K}_S^0}$ $2020$ $\pm30$ 700 APEL 1975 NICE 40 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}^{0}}$ $2050$ $\pm25$ BLUM 1975 ASPK 18.4 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1966$ $\pm25$ 4 ANISOVICH 2009 RVUE 0.0 ${{\overline{\mathit p}}}{{\mathit p}}$, ${{\mathit \pi}}{{\mathit N}}$ $1885$ ${}^{+14}_{-13}$ ${}^{+218}_{-25}$ 5 UEHARA 2009 BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ $2018$ $\pm6$ ANISOVICH 2000 J SPEC 2.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$, ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$, ${{\mathit \eta}}{{\mathit \eta}}$, ${{\mathit \eta}}{{\mathit \eta}^{\,'}}$, ${{\mathit \pi}}{{\mathit \pi}}$ $\sim$$2000$ 6 MARTIN 1998 RVUE ${{\mathit N}}$ ${{\overline{\mathit N}}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ $\sim$$2010$ 7 MARTIN 1997 RVUE ${{\overline{\mathit N}}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ $\sim$$2040$ 8 OAKDEN 1994 RVUE $0.36 - 1.55$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ $\sim$$1990$ 9 OAKDEN 1994 RVUE $0.36 - 1.55$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ $1978$ $\pm5$ 10 ALPER 1980 CNTR 62 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit n}}$ $2040$ $\pm10$ 10 ROZANSKA 1980 SPRK 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit n}}$ $1935$ $\pm13$ 10 CORDEN 1979 OMEG 12$-$15 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \pi}}$ $1988$ $\pm7$ EVANGELISTA 1979 B OMEG 10 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit n}}$ $1922$ $\pm14$ 11 ANTIPOV 1977 CIBS 25 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$3 ${{\mathit \pi}}$ 1  From the first PWA solution. 2  From a partial-wave analysis of the data. 3  From an amplitude analysis of the reaction ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$ $\rightarrow$ 2 ${{\mathit \pi}^{0}}$. 4  K matrix pole. 5  Taking into account the ${{\mathit f}_{{{2}}}{(1950)}}$. Helicity-2 production favored. 6  Energy-dependent analysis. 7  Single energy analysis. 8  From solution A 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. 9  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. 10  $\mathit I(\mathit J{}^{P}) = 0(4{}^{+})$ from amplitude analysis assuming one-pion exchange. 11  Width errors enlarged by us to 4${}\Gamma /\sqrt {\mathit N }$; see the note with the ${{\mathit K}^{*}{(892)}}$ mass.

${{\mathit f}_{{{4}}}{(2050)}}$ mass (MeV)

References