Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1994-11-22
Phys.Rev.D52:2690-2700,1995
Physics
Nuclear Physics
Nuclear Theory
25 pages, 15 Postscript figures
Scientific paper
10.1103/PhysRevD.52.2690
We investigate the structure of the scalar mesons $f_0(975)$ and $a_0(980)$ within realistic meson-exchange models of the $\pi\pi$ and $\pi\eta$ interactions. Starting from a modified version of the J\"ulich model for $\pi\pi$ scattering we perform an analysis of the pole structure of the resulting scattering amplitude and find, in contrast to existing models, a somewhat large mass for the $f_0(975)$ ($m_{f_0}=1015$ MeV, $\Gamma_{f_0}=30$ MeV). It is shown that our model provides a description of $J/\psi\rightarrow\phi\pi\pi/\phi KK$ data comparable in quality with those of alternative models. Furthermore, the formalism developed for the $\pi\pi$ system is consistently extended to the $\pi\eta$ interaction leading to a description of the $a_0(980)$ as a dynamically generated threshold effect (which is therefore neither a conventional $q\overline{q}$ state nor a $K\overline{K}$ bound state). Exploring the corresponding pole position the $a_0(980)$ is found to be rather broad ($m_{a_0}=991$ MeV, $\Gamma_{a_0}=202$ MeV). The experimentally observed smaller width results from the influence of the nearby $K\overline{K}$ threshold on this pole.
Holinde K.
Janssen Gemma
Pearce B. C.
Speth Josef
No associations
LandOfFree
On the structure of the scalar mesons $f_0(975)$ and $a_0(980)$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the structure of the scalar mesons $f_0(975)$ and $a_0(980)$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the structure of the scalar mesons $f_0(975)$ and $a_0(980)$ will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-447561