The two-nucleon electromagnetic charge operator in chiral effective field theory ($\chi$EFT) up to one loop

S. Pastore, L. Girlanda, R. Schiavilla +1

The electromagnetic charge operator in a two-nucleon system is derived in chiral effective field theory ($\chi$EFT) up to order $eQ$ (or N4LO), where $Q$ denotes the low-momentum s…