document: We propose a method for the lattice QCD computation of nucleon–nucleon low-energy interactions. It consists in simulating QCD in the background of a “electromagnetic” field whose potential is non-vanishing, but whose field strength is zero. By tuning the background field, phase-shifts at any (but small) momenta can be determined by measuring the shift of the ground state energy. Lattice sizes as small as 5 Fermi can be sufficient for the calculation of phase shifts up to momenta of order of mπ/2.
doc_bio_tags: O O O O O O B I I O O O O O O O B I O O O O O O O O O O O O O B I I I O B I I I O O O O O O O O O O B I I I I I I I B I O O O O O O O O O O B I I I O O O O O O O
extractive_keyphrases: calculation of phase shifts field strength is zero lattice qcd computation lattice sizes measuring the shift of the ground state energy simulating qcd tuning the background field
abstractive_keyphrases: electromagnetic” field lattice qcd computation of nucleon–nucleon low-energy interactions nucleon–nucleon low-energy interactions phase-shifts at any (but small) momenta