Perturbative computations of neutron-proton scattering observables using renormalization-group invariant chiral effective field theory up to N3 LO
Artikel i vetenskaplig tidskrift, 2024

We predict neutron-proton scattering cross sections and polarization observables up to next-to-next-to-next-to-leading order in a renormalization-group invariant description of the strong nucleon-nucleon interaction. Low-energy constants are calibrated to phase shifts, subleading corrections are computed in distorted-wave perturbation theory, and we employ momentum-cutoff values 500 and 2500 MeV. We find a steady order-by-order convergence and realistic descriptions of scattering observables up to a laboratory scattering energy of approximately 100 MeV. We also compare perturbative and nonperturbative calculations for phase shifts and cross sections and quantify how unitarity is gradually restored at higher orders. The perturbative approach offers an important diagnostic tool for any power counting and our results suggest that the breakdown scale in chiral effective field theory might be significantly lower than estimates obtained in nonperturbative calculations.


Oliver Thim

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Andreas Ekström

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Christian Forssén

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Physical Review C

24699985 (ISSN) 24699993 (eISSN)

Vol. 109 6 064001

Svaga och sällsynta processer i atomkärnan: fundamentala symmetrier och mörk materia

Vetenskapsrådet (VR) (2017-04234), 2018-01-01 -- 2021-12-31.

Stark nukleonkraft: atomkärnors kvantmekaniska egenskaper och neutronstjärnors tillståndsekvation

Vetenskapsrådet (VR) (2020-05127), 2021-01-01 -- 2022-12-31.

Strong interactions for precision nuclear physics (PrecisionNuclei)

Europeiska kommissionen (EU) (EC/H2020/758027), 2018-02-01 -- 2023-01-31.


Subatomär fysik



Mer information

Senast uppdaterat