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

INSPIRE   PDGID:
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
1986D
GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$2 ${{\mathit \eta}}$
$2020$ $\pm20$ 40k 2
BINON
1984B
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
1982B
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
2000J
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
1979B
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