Valence quark and meson cloud contributions for the gamma* Lambda -> Lambda* and gamma* Sigma0 -> Lambda* reactions

TL;DR

This paper investigates the valence quark and meson cloud contributions to specific electromagnetic transitions involving Lambda* and Sigma0 baryons, comparing quark model estimates with chiral unitary models to understand their structure.

Contribution

It provides a detailed analysis of the valence quark contributions and highlights the importance of phase factors in the electromagnetic form factors of hyperon transitions.

Findings

Valence quark contributions are estimated for gamma* Y -> Lambda* transitions.

The form factors depend critically on phase combinations between states.

Experimental determination of phases is possible based on the results.

Abstract

We estimate the valence quark contributions for the gamma* Y -> Lambda* (Y=Lambda, Sigma0) electromagnetic transition form factors. We focus particularly on the case Lambda*=Lambda(1670) as an analog reaction with gamma* N -> N(1535). The results are compared with those obtained from chiral unitary model, where the Lambda* resonance is dynamically generated and thus the electromagnetic structure comes directly from the meson cloud excitation of the baryon ground states. The form factors for the case Y=Sigma0 in particular, depend crucially on the two real phase (sign) combination, a phase between the Lambda and Lambda* states, and the other, the phase between the Lambda and Sigma0 radial wave functions. Depending on the combination of these two phases, the form factors for the gamma* Sigma0 -> Lambda* reaction can be enhanced or suppressed. Therefore, there is a possibility to determine the phase combination by experiments.