${{\mathit f}_{{{1}}}{(1420)}}$ MASS

INSPIRE   JSON  (beta) PDGID:
M006M2
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 1428.4 {}^{+1.5}_{-1.3}}$ OUR AVERAGE  Error includes scale factor of 1.8.  See the ideogram below.
$1433.5$ $\pm1.1$ ${}^{+27.9}_{-0.7}$ 126K
ABLIKIM
2023M
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$
$1434$ $\pm5$ $\pm5$ 133 1
ACHARD
2007
L3 $183 - 209$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$1426$ $\pm6$ 711
ABDALLAH
2003H
 DLPH 91.2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}{+}$ ${{\mathit X}}$
$1420$ $\pm14$ 3651
NICHITIU
2002
OBLX 0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$1428$ $\pm4$ $\pm2$ 20k
ADAMS
2001B
 B852 18 GeV ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}{{\mathit n}}$
$1426$ $\pm1$
BARBERIS
1997C
 OMEG 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$1425$ $\pm8$
BERTIN
1997
OBLX 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{\pm}}$( ${{\mathit K}^{0}}$) ${{\mathit \pi}^{\mp}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$1430$ $\pm4$ 2
ARMSTRONG
1992E
 OMEG 85,300 ${{\mathit \pi}^{+}}{{\mathit p}}$, ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit p}}$ , ${{\mathit p}}{{\mathit p}}$( ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$)
$1462$ $\pm20$ 3
AUGUSTIN
1992
DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$
$1443$ ${}^{+7}_{-6}$ ${}^{+3}_{-2}$ 1100
BAI
1990C
 MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$1425$ $\pm10$ 17
BEHREND
1989
CELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
$1442$ $\pm5$ ${}^{+10}_{-17}$ $111$
BECKER
1987
MRK3 ${{\mathit e}^{+}}{{\mathit e}^{-}}$, ${{\mathit \omega}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$
$1423$ $\pm4$
GIDAL
1987B
 MRK2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$
$1417$ $\pm13$ 13
AIHARA
1986C
 TPC ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$
$1422$ $\pm3$
CHAUVAT
1984
SPEC ISR 31.5 ${{\mathit p}}{{\mathit p}}$
$1440$ $\pm10$ 4
BROMBERG
1980
SPEC 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ X
$1426$ $\pm6$ 221
DIONISI
1980
HBC 4 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}{{\mathit n}}$
$1420$ $\pm20$
DAHL
1967
HBC 1.6$-$4.2 ${{\mathit \pi}^{-}}{{\mathit p}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$1430.8$ $\pm0.9$ 5
SOSA
1999
SPEC ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}_{{\mathrm {slow}}}$ (${{\mathit K}_S^0}$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$) ${{\mathit p}}_{{\mathrm {fast}}}$
$1433.4$ $\pm0.8$ 5
SOSA
1999
SPEC ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}_{{\mathrm {slow}}}$ (${{\mathit K}_S^0}$ ${{\mathit K}^{-}}{{\mathit \pi}^{+}}$) ${{\mathit p}}_{{\mathrm {fast}}}$
$1435$ $\pm9$
PROKOSHKIN
1997B
 GAM4 100 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit n}}$
$1429$ $\pm3$ $389$
ARMSTRONG
1989
OMEG 300 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}{{\mathit p}}{{\mathit p}}$
$1425$ $\pm2$ 1520
ARMSTRONG
1984
OMEG 85 ${{\mathit \pi}^{+}}{{\mathit p}}$, ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ( ${{\mathit \pi}^{+}}$ ,${{\mathit p}}$) ( ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$) ${{\mathit p}}$
$\sim$$1420$
BITYUKOV
1984
SPEC 32 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}{{\mathit Y}}$
1  From a fit with a width fixed at 55 MeV.
2  This result supersedes ARMSTRONG 1984, ARMSTRONG 1989.
3  From fit to the ${{\mathit K}^{*}{(892)}}{{\mathit K}}{}^{}1{}^{++}$ partial wave.
4  Mass error increased to account for ${{\mathit a}_{{{0}}}{(980)}}$ mass cut uncertainties.
5  No systematic error given.

           ${{\mathit f}_{{{1}}}{(1420)}}$ mass (MeV)
References