${{\mathit f}_{{0}}{(2020)}}$ MASS

INSPIRE   PDGID:
M156M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$1982$ $\pm3$ ${}^{+54}_{-0}$ 1
ABLIKIM
2022C
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}}{{\mathit \eta}^{\,'}}$ $\rightarrow$ 4 ${{\mathit \gamma}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
• • We do not use the following data for averages, fits, limits, etc. • •
$2010$ $\pm6$ ${}^{+6}_{-4}$ 2
ABLIKIM
2022AS
 BES3 ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \eta}^{\,'}}$
$2037$ $\pm8$ 80k 3
UMAN
2006
E835 5.2 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$2040$ $\pm38$
ANISOVICH
2000J
 SPEC
$2010$ $\pm60$
ALDE
1998
GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$
1  From a partial wave analysis of the systems ( ${{\mathit \gamma}}{{\mathit X}}$ ), with ${{\mathit X}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit \eta}^{\,'}}$ , and ( ${{\mathit \eta}^{\,'}}{{\mathit X}}$ ), with ${{\mathit X}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}}$ in the decay ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}}{{\mathit \eta}^{\,'}}$ . The intermediate resonance ${{\mathit X}}$ is parametrized by a constant-width, relativistic Breit-Wigner.
2  From a Breit-Wigner fit involving 9 resonances and a resonating exotic ${{\mathit \eta}_{{1}}{(1855)}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}^{\,'}}$ ${\mathit P}{\mathrm -wave}$.
3  Statistical error only.
References:
ABLIKIM 2022AS
PR D106 072012 Partial wave analysis of J/??????
Also
PR D107 079901 (errat.)
ABLIKIM 2022C
PR D105 072002 Partial wave analysis of $J/\psi \rightarrow \gamma \eta' \eta'$
UMAN 2006
PR D73 052009 Light Quark Resonances in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilations at 5.2 GeV/$\mathit c$
ANISOVICH 2000J
PL B491 47 I = 0 C = +1 Mesons from 1920 to 2410 MeV
ALDE 1998
EPJ A3 361 Study of the ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ System with the GAMS-4000 Spectrometer at 100 ${\mathrm {GeV/}}\mathit c$
Also
PAN 62 405 Investigation of the ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ System at a Primary Momentum of 100 ${\mathrm {GeV/}}\mathit c$ by using the GAMS-4000 Spectrometer