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Matching pion-nucleon Roy-Steiner equations to chiral perturbation theory
Martin Hoferichter, Jacobo Ruiz de Elvira, Bastian Kubis +1
We match the results for the subthreshold parameters of pion-nucleon scattering obtained from a solution of Roy-Steiner equations to chiral perturbation theory up to next-to-next-t…
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…
Precision calculation of threshold pi^- d scattering, pi N scattering lengths, and the GMO sum rule
V. Baru, C. Hanhart, M. Hoferichter +3
We use chiral perturbation theory (ChPT) to calculate the scattering length with an accuracy of a few percent, including isospin-violating corrections both in the two- and…
Precision calculation of the pi^- deuteron scattering length and its impact on threshold pi-N scattering
V. Baru, C. Hanhart, M. Hoferichter +3
We present a calculation of the pi^- d scattering length with an accuracy of a few percent using chiral perturbation theory. For the first time isospin-violating corrections are in…
Charge-symmetry-breaking nucleon form factors
Bastian Kubis
A quantitative understanding of charge-symmetry breaking is an increasingly important ingredient for the extraction of the nucleon's strange vector form factors. We review the theo…