$\gamma^\ast N \to N(1535)$ transition form factors

TL;DR

This paper calculates the transition form factors and helicity amplitudes for the $ o N(1535)$ process using QCD light cone sum rules, providing theoretical predictions and comparisons with existing data.

Contribution

It introduces a method to eliminate diagonal transition contamination in sum rules for more accurate form factor and residue determination.

Findings

Predicted helicity amplitudes agree with experimental data.

Provided new theoretical estimates for the $ o N(1535)$ transition.

Enhanced understanding of negative parity baryon properties.

Abstract

The form factors, as well as the helicity amplitudes for the $\gamma^\ast N \to N(1535)$ transition are calculated in framework of the QCD light cone sum rules. The contamination coming from diagonal transition is eliminated by considering combinations of the sum rules corresponding to different Lorentz structures. Similar procedure is applied for determination of the residue and mass of the negative parity baryon. Comparison of our predictions on the helicity amplitudes with the existing theoretical and experimental results is also presented.