Lu Jun-Xu, Wang Chun-Xuan, Xiao Yang, Geng Li-Sheng, Meng Jie, Ring Peter
School of Space and Environment, Beihang University, Beijing 102206, China.
School of Physics, Beihang University, Beijing 102206, China.
Phys Rev Lett. 2022 Apr 8;128(14):142002. doi: 10.1103/PhysRevLett.128.142002.
We construct a relativistic chiral nucleon-nucleon interaction up to the next-to-next-to-leading order in covariant baryon chiral perturbation theory. We show that a good description of the np phase shifts up to T_{lab}=200 MeV and even higher can be achieved with a χ[over ˜]^{2}/d.o.f. less than 1. Both the next-to-leading-order results and the next-to-next-to-leading-order results describe the phase shifts equally well up to T_{lab}=200 MeV, but for higher energies, the latter behaves better, showing satisfactory convergence. The relativistic chiral potential provides the most essential inputs for relativistic ab initio studies of nuclear structure and reactions, which has been in need for almost two decades.
