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

INSPIRE   JSON  (beta) PDGID:
M036W1
VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 50\text{ to }100 }$ OUR ESTIMATE  Width determination very model dependent. Peak width in ${{\mathit \eta}}{{\mathit \pi}}$ is about 60 MeV, but decay width can be much larger.
• • We do not use the following data for averages, fits, limits, etc. • •
$75.6$ $\pm1.6$ ${}^{+17.4}_{-10.0}$ 1
UEHARA
2009A
 BELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}$
$50$ $\pm13$ $\pm4$ 318
ACHARD
2002B
 L3 $183 - 209$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ ${{\mathit e}^{-}}$ ${{\mathit \eta}}$ ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$
$72$ $\pm16$
BARBERIS
2000H
 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{{f}}}}{{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit p}_{{{s}}}}$
$61$ $\pm19$
BARBERIS
2000H
 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Delta}_{{{f}}}^{++}}{{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}_{{{s}}}}$
$\sim{}\text{ 42}$ 2
OLLER
1999
RVUE ${{\mathit \eta}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$
$\sim{}\text{ 112}$ 2
OLLER
1999B
 RVUE ${{\mathit \pi}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$
$71$ $\pm7$
TEIGE
1999
B852 $18.3$ ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$
$92$ $\pm20$ 2
ANISOVICH
1998B
 RVUE Compilation
$65$ $\pm10$ 3
BERTIN
1998B
 OBLX $\pm{}$ 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{\pm}}{{\mathit K}_{{{s}}}}{{\mathit \pi}^{\mp}}$
$\sim{}\text{ 100}$
TORNQVIST
1996
RVUE ${{\mathit \pi}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$, ${{\mathit K}}{{\mathit \pi}}$, ${{\mathit \eta}}{{\mathit \pi}}$
$202$
JANSSEN
1995
RVUE ${{\mathit \eta}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}}$, ${{\mathit K}}{{\overline{\mathit K}}}$, ${{\mathit K}}{{\mathit \pi}}$, ${{\mathit \eta}}{{\mathit \pi}}$
$54.12$ $\pm0.34$ $\pm0.12$
AMSLER
1994C
 CBAR $0.0$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$54$ $\pm10$ 4
AMSLER
1992
CBAR 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$
$95$ $\pm14$ 1040 4
ARMSTRONG
1991B
 OMEG $\pm{}$ 300 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$62$ $\pm15$ 500 5
EVANGELISTA
1981
OMEG $\pm{}$ 12 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}{{\mathit p}}$
$60$ $\pm20$ 145 5
GURTU
1979
HBC $\pm{}$ 4.2 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$60$ ${}^{+50}_{-30}$ 47
CONFORTO
1978
OSPK - 4.5 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit X}^{-}}$
$86.0$ ${}^{+60.0}_{-50.0}$ 50
CORDEN
1978
OMEG $\pm{}$ 12$-$15 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$44$ $\pm22$
GRASSLER
1977
HBC - 16 ${{\mathit \pi}^{\mp}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \eta}}$3 ${{\mathit \pi}}$
$80\text{ to }300 $ 6
FLATTE
1976
RVUE - 4.2 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$16.0$ ${}^{+25.0}_{-16.0}$ 70 7
WELLS
1975
HBC - 3.1$-$6 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
$30$ $\pm5$ 150 8
DEFOIX
1972
HBC $\pm{}$ 0.7 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ 7 ${{\mathit \pi}}$
$40$ $\pm15$
CAMPBELL
1969
DBC $\pm{}$ 2.7 ${{\mathit \pi}^{+}}{{\mathit d}}$
$60$ $\pm30$ 15
MILLER
1969B
 HBC - 4.5 ${{\mathit K}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}}{{\mathit \Lambda}}$
$80$ $\pm30$ 30
AMMAR
1968
HBC $\pm{}$ 5.5 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$2 ${{\mathit \pi}}$
1  From a fit with the S-wave amplitude including two interfering Breit-Wigners plus a background term.
2  T-matrix pole.
3  The ${{\mathit \eta}}{{\mathit \pi}}$ width.
4  From a single Breit-Wigner fit.
5  From ${{\mathit f}_{{{1}}}{(1285)}}$ decay.
6  Using a two-channel resonance parametrization of GAY 1976B data.
7  Weak evidence only for ${{\mathit a}_{{{0}}}{(980)}^{+}}$ production.
8  This number has very little meaning. Error is much too small. Vlada
References