2021/12/03 by Manuel Pavón Valderrama, Valderrama, Manuel Pavon
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #FOS: Physical sciences #Nuclear Theory (nucl-th) #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2112.02076
openalex publication_date 2021/12/03 · openalex created_date 2022/05/05 · openalex updated_date 2026/07/28
In the effective field theory formalism nuclear forces are organized as a low energy expansion. Usually the lowest order in this expansion corresponds to the non-perturbative iteration of the one-pion exchange potential and a few contact-range operators as to ensure renormalization group invariance. Here we consider an alternative expansion in which two-pion exchange becomes the lowest order finite range interaction and as such is expected to be iterated. A comparison of this new expansion with the standard one shows a better convergence pattern for a few selected partial waves (1S0, 3P0 and 3S1-3D1) in two-nucleon scattering, in particular for the 1S0 channel (though both expansions converge well). We briefly comment on the possible theoretical grounds for the expansion around two-pion exchange from the point of view of effective field theory.