${{\mathit \eta}^{\,'}{(958)}}$ MASS

INSPIRE   PDGID:
M002M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 957.78 \pm0.06}$ OUR AVERAGE
$957.793$ $\pm0.054$ $\pm0.036$ 3.9k
LIBBY
2008
CLEO ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}}$
$957.9$ $\pm0.2$ $\pm0.6$ 4800
WURZINGER
1996
SPEC 1.68 ${{\mathit p}}$ ${{\mathit d}}$ $\rightarrow$ ${}^{3}\mathrm {He}$ ${{\mathit \eta}^{\,'}}$
$957.46$ $\pm0.33$
DUANE
1974
MMS ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}$ MM
$958.2$ $\pm0.5$ 1414
DANBURG
1973
HBC 2.2 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}^{\,'}}$
$958$ $\pm1$ 400
JACOBS
1973
HBC 2.9 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}^{\,'}}$
$956.1$ $\pm1.1$ 3415 1
BASILE
1971
CNTR 1.6 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \eta}^{\,'}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$957.5$ $\pm0.2$
BAI
2004J
BES2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$959$ $\pm1$ $630$ 2
BELADIDZE
1992C
VES 36 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {Be}$ ${{\mathit \pi}^{-}}$ ${{\mathit \eta}^{\,'}}$ ${{\mathit \eta}}$ ${}^{}\mathrm {Be}$
$958$ $\pm1$ 340 2
ARMSTRONG
1991B
OMEG 300 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$958.2$ $\pm0.4$ 622 2
AUGUSTIN
1990
DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$957.8$ $\pm0.2$ 2420 2
AUGUSTIN
1990
DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$956.3$ $\pm1.0$ $143$ 2
GIDAL
1987
MRK2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$957.4$ $\pm1.4$ 535 3
BASILE
1971
CNTR 1.6 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \eta}^{\,'}}$
$957$ $\pm1$
RITTENBERG
1969
HBC 1.7$-$2.7 ${{\mathit K}^{-}}{{\mathit p}}$
1  Using all ${{\mathit \eta}^{\,'}}$ decays.
2  Systematic uncertainty not estimated.
3  Using ${{\mathit \eta}^{\,'}}$ decays into neutrals. Not independent of the other listed BASILE 1971 ${{\mathit \eta}^{\,'}}$ mass measurement.
References