${{\mathit a}_{{0}}{(980)}}$ T-MATRIX POLE $\sqrt {\mathit s }$

INSPIRE   PDGID:
M036PP
Note that $\Gamma \approx{}$2 Im($\sqrt {s }$).
VALUE (MeV) DOCUMENT ID TECN  COMMENT
$\bf{ (960 - 1030) − {\mit i} (20 - 70)}$ OUR ESTIMATE  (see Fig. 64.2 in the review)
$(989 \pm5) − {\mit i}(40 \pm5)$ 1
BUGG
2008A
 RVUE ${{\overline{\mathit p}}}{{\mathit p}}$ annihilation data
$(1117 {}^{+24}_{-320}) − {\mit i}(12 {}^{+43}_{-12})$ 2
PELAEZ
2004A
 RVUE ${{\mathit \pi}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ , ${{\mathit \pi}}$ ${{\mathit K}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit K}}$
$(982 \pm3) − {\mit i}(46 \pm4)$ 3
ABELE
1998
CBAR 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}_L^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
1  T-matrix pole on sheet II. Parameterizes couplings to ${{\overline{\mathit K}}}{{\mathit K}}$ , ${{\mathit \pi}}{{\mathit \eta}}$ , and ${{\mathit \pi}}{{\mathit \eta}^{\,'}}$ . Uses AMSLER 1994D and ABELE 1998 .
2  Reanalysis of data from LINGLIN 1973 , ESTABROOKS 1978 , and ASTON 1988 in the unitarized ChPT model.
3  T-matrix pole on sheet II; the pole on sheet III is at (1006 $−$ ${\mit i}$ 49) MeV.
References:
BUGG 2008A
PR D78 074023 Reanalysis of Data on ${{\mathit a}_{{0}}{(1450)}}$ and ${{\mathit a}_{{0}}{(980)}}$
PELAEZ 2004A
MPL A19 2879 Light Scalars as Tetraquarks or Two-meson States from Large ${{\mathit N}_{{c}}}$ and Unitarized Chiral Perturbation Theory
ABELE 1998
PR D57 3860 ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation at Rest into ${{\mathit K}_L^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$