First results for electromagnetic three-nucleon form factors from high-precision two-nucleon interactions

TL;DR

This paper presents initial calculations of three-nucleon electromagnetic form factors using high-precision two-nucleon interactions within the Covariant Spectator Theory, highlighting differences between models WJC-1 and WJC-2.

Contribution

It introduces a calculation of three-nucleon form factors using high-precision two-nucleon models within a covariant framework, comparing relativistic effects across models.

Findings

WJC-2 form factors are similar to older models and nonrelativistic results.

WJC-1 form factors show larger deviations, influenced by pion-nucleon coupling differences.

Results enhance understanding of relativistic effects in three-nucleon systems.

Abstract

The electromagnetic form factors of the three-nucleon bound states were calculated in Complete Impulse Approximation in the framework of the Covariant Spectator Theory for the new high-precision two-nucleon interaction models WJC-1 and WJC-2. The calculations use an approximation for the three-nucleon vertex functions with two nucleons off mass shell. The form factors with WJC-2 are close to the ones obtained with the older model W16 and to nonrelativistic potential calculations with lowest-order relativistic corrections, while the form factors with the most precise two-nucleon model WJC-1 exhibit larger differences. These results can be understood when the effect of the different types of pion-nucleon coupling used in the various models is examined.