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Roy-Steiner equations for pi N scattering
Christoph Ditsche, Martin Hoferichter, Bastian Kubis +1
Starting from hyperbolic dispersion relations for the invariant amplitudes of pion-nucleon scattering together with crossing symmetry and unitarity, one can derive a closed system…
Improved dispersive analysis of the scalar form factor of the nucleon
Martin Hoferichter, Christoph Ditsche, Bastian Kubis +1
We present a coupled system of integral equations for the pi pi --> Nbar N and Kbar K --> Nbar N S-waves derived from Roy-Steiner equations for pion-nucleon scattering. We discuss…
Isospin breaking in pion-deuteron scattering and the pion-nucleon scattering lengths
Martin Hoferichter, Vadim Baru, Christoph Hanhart +3
In recent years, high-accuracy data for pionic hydrogen and deuterium have become the primary source of information on the pion-nucleon scattering lengths. Matching the experimenta…
Extracting the chiral anomaly from gamma pi --> pi pi
Martin Hoferichter, Bastian Kubis, Dimitrios Sakkas
We derive dispersive representations for the anomalous process gamma pi --> pi pi with the pi pi P-wave phase shift as input. We investigate how in this framework the chiral anomal…
Dispersive analysis of the scalar form factor of the nucleon
M. Hoferichter, C. Ditsche, B. Kubis +1
Based on the recently proposed Roy-Steiner equations for pion-nucleon scattering, we derive a system of coupled integral equations for the pi pi --> N-bar N and K-bar K --> N-bar N…
Roy-Steiner equations for pion-nucleon scattering
C. Ditsche, M. Hoferichter, B. Kubis +1
Starting from hyperbolic dispersion relations, we derive a closed system of Roy-Steiner equations for pion-nucleon scattering that respects analyticity, unitarity, and crossing sym…