Two-nucleon electromagnetic charge operator in chiral effective field theory ({chi}EFT) up to one loop
- Physics Division, Argonne National Laboratory, Illinois 60439 (United States)
- Department of Physics, Universita del Salento, I-73100 Lecce (Italy)
- Department of Physics, Old Dominion University, Norfolk, Virginia 23529 (United States)
- INFN Sezione di Pisa, I-56127 Pisa (Italy)
The electromagnetic charge operator in a two-nucleon system is derived in chiral effective field theory ({chi}EFT) up to order e Q[or next-to-next-to-next-to-next-to-leading order (N4LO)], where Q denotes the low-momentum scale and e is the electric charge. The specific form of the N3LO and N4LO corrections from, respectively, one-pion-exchange and two-pion-exchange depends on the off-the-energy-shell prescriptions adopted for the nonstatic terms in the corresponding potentials. We show that different prescriptions lead to unitarily equivalent potentials and accompanying charge operators. Thus, provided a consistent set is adopted, predictions for physical observables will remain unaffected by the nonuniqueness associated with these off-the-energy-shell effects.
- OSTI ID:
- 21596637
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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