379 citations · 1.4k across the 14 of their papers we have counts for
14 papers
Sum rule for the Compton amplitude and implications for the proton-neutron mass difference
J. Gasser, H. Leutwyler, A. Rusetsky
The Cottingham formula expresses the leading contribution of the electromagnetic interaction to the proton-neutron mass difference as an integral over the forward Compton amplitude…
On the mass difference between proton and neutron
J. Gasser, H. Leutwyler, A. Rusetsky
The Cottingham formula expresses the electromagnetic part of the mass of a particle in terms of the virtual Compton scattering amplitude. At large photon momenta, this amplitude is…
Hadronic Atoms
J. Gasser, V. E. Lyubovitskij, A. Rusetsky
We review the theory of hadronic atoms in QCD+QED. The non-relativistic effective Lagrangian approach, used to describe this type of bound states, is illustrated with the case of p…
On the precision of the theoretical predictions for pi pi scattering
I. Caprini, G. Colangelo, J. Gasser +1
In a recent paper, Pelaez and Yndurain evaluate some of the low energy observables of pi pi scattering and obtain flat disagreement with our earlier results. The authors work with…
Electromagnetic corrections in hadronic processes
J. Gasser, A. Rusetsky, I. Scimemi
In quantum field theory, the splitting of the Hamiltonian into a strong and an electromagnetic part cannot be performed in a unique manner. We propose a convention for disentanglin…
Decays of the pi+ pi- atom
J. Gasser, V. E. Lyubovitskij, A. Rusetsky +1
We construct an effective non-relativistic quantum field theory that describes bound states of pi+ pi- pairs and their hadronic decays. We then derive a general expression for the…