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11 papers · 2 filters
Effective forces between quantum bound states
Alexander Rokash, Evgeny Epelbaum, Hermann Krebs +1
Recent ab initio lattice studies have found that the interactions between alpha particles (4He nuclei) are sensitive to seemingly minor details of the nucleon-nucleon force such as…
Renormalization of the three-boson system with short-range interactions revisited
E. Epelbaum, J. Gegelia, Ulf-G. Meißner +1
We consider renormalization of the three-body scattering problem in low-energy effective field theory of self-interacting scalar particles by applying time-ordered perturbation the…
Leading order relativistic chiral nucleon-nucleon interaction
Xiu-Lei Ren, Kai-Wen Li, Li-Sheng Geng +3
Motivated by the successes of relativistic theories in studies of atomic/molecular and nuclear systems and the need for a relativistic chiral force in relativistic nuclear structur…
Nuclear axial current operators to fourth order in chiral effective field theory
H. Krebs, E. Epelbaum, U. -G. Meißner
We present the complete derivation of the nuclear axial charge and current operators as well as the pseudoscalar operators to fourth order in the chiral expansion relative to the d…
Reconciling threshold and subthreshold expansions for pion-nucleon scattering
D. Siemens, J. Ruiz de Elvira, E. Epelbaum +4
Heavy-baryon chiral perturbation theory (ChPT) at one loop fails in relating the pion-nucleon amplitude in the physical region and for subthreshold kinematics due to loop effects e…
Two-nucleon scattering in a modified Weinberg approach with a symmetry-preserving regularization
J. Behrendt, E. Epelbaum, J. Gegelia +2
We consider the nucleon-nucleon scattering problem by applying time-ordered perturbation theory to the Lorentz invariant formulation of baryon chiral perturbation theory. Using a s…