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

Note that $\Gamma $ = $−$2 Im($\sqrt {s }$).
M036PP
VALUE (MeV) DOCUMENT ID TECN  COMMENT
$\bf{ (970 - 1020) − {\mit i} (30 - 70)}$ OUR ESTIMATE  (see Fig. 64.2 in the review)
$(1002.4 \pm1.4 \pm6.6) − {\mit i}(63.5 \pm2.9)$ 1
ALBRECHT
2020
CBAR 0.9 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \eta}}$ , ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$ , ${{\mathit \pi}^{0}}{{\mathit K}^{+}}{{\mathit K}^{-}}$
$(1000.7 {}^{+12.9}_{-0.7}) − {\mit i}(36.6 {}^{+12.7}_{-2.6})$ 2
LU
2020
RVUE ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}$ , ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$
$(989 \pm5) − {\mit i}(40 \pm5)$ 3
BUGG
2008A
 RVUE ${{\overline{\mathit p}}}{{\mathit p}}$ annihilation data
$(1117 {}^{+24}_{-320}) − {\mit i}(12 {}^{+43}_{-12})$ 4
PELAEZ
2004A
 RVUE ${{\mathit \pi}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$, ${{\mathit \pi}}$ ${{\mathit K}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit K}}$
$(982 \pm3) − {\mit i}(46 \pm4)$ 5
ABELE
1998
CBAR 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}_L^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$
1  Pole mass on sheet closest to the physical axis - the more remote pole is extracted at ($1004.1$ $\pm1.5$ $\pm6.5$) $−$ ${\mit i}(48.6$ $\pm1.2$ $\pm3.4$) MeV.
2  T-matrix pole on sheet II.
3  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.
4  Reanalysis of data from LINGLIN 1973, ESTABROOKS 1978, and ASTON 1988 in the unitarized ChPT model.
5  T-matrix pole on sheet II; the pole on sheet III is at (1006 $−$ ${\mit i}$ 49) MeV.
  References:
ALBRECHT 2020
EPJ C80 453 Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data
LU 2020
EPJ C80 436 The $\pi \eta $ interaction and $a_0$ resonances in photon?photon scattering
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 ${{\mathit K}_L^0}$  ${{\mathit K}^{\pm}}$ ${{\mathit \pi}^{\mp}}$