Neutron-proton scattering with lattice chiral effective field theory at next-to-next-to-next-to-leading order

WOS:000447466500002We present a new lattice formulation of chiral effective field theory interactions with a simpler decomposition into spin channels. With these interactions the process of fitting to the empirical scattering phase shifts is simplified, and the resulting lattice phase shifts are more accurate than in previous studies. We present results for the neutron-proton system up to next-to-next-to-next-to-leading order for lattice spacings of 1.97, 1.64, 1.32, and 0.99 fm. Our results provide a pathway to ab initio lattice calculations of nuclear structure, reactions, and thermodynamics with accurate and systematic control over the chiral nucleon-nucleon force.Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [TRR110]; BMBFFederal Ministry of Education & Research (BMBF) [05P15PCFN1]; US Department of EnergyUnited States Department of Energy (DOE) [DE-SC0018638]; Scientific and Technological Research Council of Turkey (TUBITAK Project)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [116F400]; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) [2018DM0034]; VolkswagenStiftungVolkswagen [93562]We acknowledge partial financial support from the Deutsche Forschungsgemeinschaft (TRR110, Symmetries and the Emergence of Structure in QCD), the BMBF (Grant No. 05P15PCFN1), the US Department of Energy (DE-SC0018638), and the Scientific and Technological Research Council of Turkey (TUBITAK Project No. 116F400). Further support was provided by the Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI; Grant No. 2018DM0034) and by VolkswagenStiftung (Grant No. 93562). The computational resources were provided by the Julich Supercomputing Centre at Forschungszentrum Julich, Oak Ridge Leadership Computing Facility, RWTH Aachen, North Carolina State University, and Michigan State University