494 citations · 1.7k across the 10 of their papers we have counts for
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hep-ph2000★ 142 cited
The pi pi S-wave scattering lengths
G. Colangelo, J. Gasser, H. Leutwyler
We match the known chiral perturbation theory representation of the pi pi scattering amplitude to two loops with a phenomenological description that relies on the Roy equations. On…
hep-ph2000★ 379 cited
Roy equation analysis of pi pi scattering
B. Ananthanarayan, G. Colangelo, J. Gasser +1
We analyze the Roy equations for the lowest partial waves of elastic pi pi scattering and demonstrate that the two S-wave scattering lengths a_0^0 and a_0^2 are the essential param…