${{\mathit a}_{{{0}}}{(980)}}$ MASS

${{\mathit \eta}}{{\mathit \pi}}$ FINAL STATE ONLY

INSPIRE   PDGID:
M036M1
VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$982.5$ $\pm1.6$ $\pm1.1$ 16.9k 1
AMBROSINO
2009F
KLOE 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \gamma}}$
$986$ $\pm4$
ANISOVICH
2009
RVUE 0.0 ${{\overline{\mathit p}}}{{\mathit p}}$, ${{\mathit \pi}}{{\mathit N}}$
$982.3$ ${}^{+0.6}_{-0.7}$ ${}^{+3.1}_{-4.7}$ 2
UEHARA
2009A
BELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}$
$985$ $\pm4$ $\pm6$ 318
ACHARD
2002B
L3 $183 - 209$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ ${{\mathit e}^{-}}$ ${{\mathit \eta}}$ ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$
$995$ ${}^{+52}_{-10}$ 36 3
ACHASOV
2000F
SND ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \gamma}}$
$994$ ${}^{+33}_{-8}$ 36 4
ACHASOV
2000F
SND ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \gamma}}$
$975$ $\pm7$
BARBERIS
2000H
450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}{{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit p}_{{{s}}}}$
$988$ $\pm8$
BARBERIS
2000H
450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}_{{{f}}}^{++}}{{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}_{{{s}}}}$
$\sim{}\text{ 1055}$ 5
OLLER
1999
RVUE ${{\mathit \eta}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$
$\sim{}\text{ 1009.2}$ 5
OLLER
1999B
RVUE ${{\mathit \pi}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$
$993.1$ $\pm2.1$ 6
TEIGE
1999
B852 $18.3$ ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$
$988$ $\pm6$ 5
ANISOVICH
1998B
RVUE Compilation
$987$
TORNQVIST
1996
RVUE ${{\mathit \pi}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$, ${{\mathit K}}{{\mathit \pi}}$, ${{\mathit \eta}}{{\mathit \pi}}$
$991$
JANSSEN
1995
RVUE ${{\mathit \eta}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$, ${{\mathit K}}{{\mathit \pi}}$, ${{\mathit \eta}}{{\mathit \pi}}$
$984.45$ $\pm1.23$ $\pm0.34$
AMSLER
1994C
CBAR $0.0$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$982$ $\pm2$ 7
AMSLER
1992
CBAR 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$984$ $\pm4$ 1040 7
ARMSTRONG
1991B
OMEG $\pm{}$ 300 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$976$ $\pm6$
ATKINSON
1984E
OMEG $\pm{}$ 25$-$55 ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}}{{\mathit n}}$
$986$ $\pm3$ 500 8
EVANGELISTA
1981
OMEG $\pm{}$ 12 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$
$990$ $\pm7$ 145 8
GURTU
1979
HBC $\pm{}$ 4.2 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$980$ $\pm11$ 47
CONFORTO
1978
OSPK - 4.5 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}^{-}}$
$978$ $\pm16$ 50
CORDEN
1978
OMEG $\pm{}$ 12$-$15 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$977$ $\pm7$
GRASSLER
1977
HBC - 16 ${{\mathit \pi}^{\mp}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \eta}}$3 ${{\mathit \pi}}$
$989$ $\pm4$ 70
WELLS
1975
HBC - 3.1$-$6 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$972$ $\pm10$ 150
DEFOIX
1972
HBC $\pm{}$ 0.7 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 7 ${{\mathit \pi}}$
$970$ $\pm15$ 20
BARNES
1969C
HBC - 4$-$5 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$980$ $\pm10$
CAMPBELL
1969
DBC $\pm{}$ 2.7 ${{\mathit \pi}^{+}}{{\mathit d}}$
$980$ $\pm10$ 15
MILLER
1969B
HBC - 4.5 ${{\mathit K}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \Lambda}}$
$980$ $\pm10$ 30
AMMAR
1968
HBC $\pm{}$ 5.5 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
1  Using the model of ACHASOV 1989 and ACHASOV 2003B.
2  From a fit with the S-wave amplitude including two interfering Breit-Wigners plus a background term.
3  Using the model of ACHASOV 1989. Supersedes ACHASOV 1998B.
4  Using the model of JAFFE 1977. Supersedes ACHASOV 1998B.
5  T-matrix pole.
6  Breit-Wigner fit, average between ${{\mathit a}_{{{0}}}^{\pm}}$ and ${{\mathit a}_{{{0}}}^{0}}$. The fit favors a slightly heavier ${{\mathit a}_{{{0}}}^{\pm}}$.
7  From a single Breit-Wigner fit.
8  From ${{\mathit f}_{{{1}}}{(1285)}}$ decay.
References