N*(1535) electroproduction at high Q2

TL;DR

This paper uses a covariant spectator quark model to analyze the gamma N -> N*(1535) reaction at high Q2, deriving transition form factors and a relation between helicity amplitudes without extra parameters.

Contribution

It introduces a parameter-free determination of the N*(1535) wave function and derives a new relation between helicity amplitudes at high Q2.

Findings

Calculated transition form factors for gamma N -> N*(1535)

Derived a relation between A12 and S12 helicity amplitudes for Q2 > 1 GeV^2

Validated the covariant spectator quark model at high Q2

Abstract

A covariant spectator quark model is applied to study the gamma N -> N*(1535) reaction in the large Q2 region. Starting from the relation between the nucleon and N*(1535) systems, the N*(1535) valence quark wave function is determined without the addition of any parameters. The model is then used to calculate the gamma N -> N*(1535) transition form factors. A very interesting, useful relation between the A12 and S12 helicity amplitudes for Q2 > GeV^2, is also derived.