J. Gasser

activity

19942015

most citedππscattering

760 citations · 1.8k across the 24 of their papers we have counts for

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hep-ph1994

The $π π$ scattering amplitude in chiral perturbation theory

J. Gasser

We discuss $π π$ scattering in the framework of chiral perturbation theory. In particular, we recall the predictions made some time ago for the threshold parameters and for the phas…

hep-ph1994★ 140 cited

$K_{l 4}$ - Decays Beyond One Loop

J. Bijnens, G. Colangelo, J. Gasser

The matrix elements for $K \to π π ł ν$ decays are described by four form factors $F, G, H$ and $R$ . We complete previous calculations by evaluating $R$ at next-to-leading order…

hep-ph1994★ 154 cited

Low-Energy Photon-Photon Collisions to Two-Loop Order

S. Bellucci, J. Gasser, M. E. Sainio

We evaluate the amplitude for $γ γ \to π^{0} π^{0}$ to two loops in chiral perturbation theory. The three new counterterms which enter at this order in the low-energy expansion a…

The ππ scattering amplitude in chiral perturbation theory

Kl4​ - Decays Beyond One Loop

Low-Energy Photon-Photon Collisions to Two-Loop Order

The $π π$ scattering amplitude in chiral perturbation theory

$K_{l 4}$ - Decays Beyond One Loop