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- W2039200071 abstract "We analyze the power counting of two-body currents in nuclear effective field theories (EFTs). We find that the existence of nonperturbative physics at low energies, which is manifest in the existence of the deuteron and the $^{1}{S}_{0}$ $NN$ virtual bound state, combined with the appearance of singular potentials in versions of nuclear EFT that incorporate chiral symmetry, modifies the renormalization-group flow of the couplings associated with contact operators that involve nucleon-nucleon pairs and external fields. The order of these couplings is thereby enhanced with respect to the naive-dimensional-analysis estimate. Consequently, short-range currents enter at a lower order in the chiral EFT than has been appreciated up until now, and their impact on low-energy observables is concomitantly larger. We illustrate the changes in the power counting with a few low-energy processes involving external probes and few-nucleon systems, including electron-deuteron elastic scattering and radiative neutron capture by protons." @default.
- W2039200071 created "2016-06-24" @default.
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- W2039200071 date "2015-02-27" @default.
- W2039200071 modified "2023-10-02" @default.
- W2039200071 title "Power Counting of Contact-Range Currents in Effective Field Theory" @default.
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- W2039200071 doi "https://doi.org/10.1103/physrevlett.114.082502" @default.
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