Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-04-14
Mod.Phys.Lett.A24:2285-2289,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages, no figures
Scientific paper
10.1142/S0217732309031533
First it is shown that the tree amplitude for pion pion scattering in the minimal linear sigma model has an exact expression which is proportional to a geometric series in the quantity (s-$m_\pi^2$)/($m_B^2-m_\pi^2$), where $m_B$ is the sigma mass which appears in the Lagrangian and is the only a priori unknown parameter in the model. This induces an infinite series for every predicted scattering length in which each term corresponds to a given order in the chiral perturbation theory counting. It is noted that, perhaps surprisingly, the pattern, though not the exact values, of chiral perturbation theory predictions for both the isotopic spin 0 and isotopic spin 2 s-wave pion-pion scattering lengths to orders $p^2$, $p^4$ and $p^6$ seems to agree with this induced pattern. The values of the $p^8$ terms are also given for comparison with a possible future chiral perturation theory calculation. Further aspects of this approach and future directions are briefly discussed.
Black Deirdre
Fariborz Amir H.
Jora Renata
Park Nae Woong
Schechter Joseph
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