Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 52, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1140/epja/i2016-16296-5
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Funding
- Georgian Shota Rustaveli National Science Foundation [FR/417/6-100/14]
- DFG [SFB/TR 110]
- BMBF [05P2015 - NUSTAR RD]
- Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) [2015VMA076]
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We consider the nucleon-nucleon scattering problem by applying time-ordered perturbation theory to the Lorentz-invariant formulation of baryon chiral perturbation theory. We employ a higher-derivative symmetry-preserving regularization to obtain an integral equation for the scattering amplitude, which permits a non-perturbative treatment of subleading contributions to the nucleon-nucleon potential. The resulting formulation is used to quantify finite regulator artefacts in two-nucleon phase shifts as well as in the chiral extrapolations of the S-wave scattering lengths and the deuteron binding energy. Our approach can be straightforwardly extended to analyse few-nucleon systems and processes involving external electroweak sources.
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