Photoproduction of hypernuclei within the quark-meson coupling model

TL;DR

This paper investigates the photoproduction of the ^12{_Lambda}B hypernucleus using a covariant effective Lagrangian model with quark-meson coupling derived hyperon states, highlighting differences from phenomenological models.

Contribution

It introduces a novel approach using quark-meson coupling model for hyperon bound states in hypernuclear photoproduction calculations.

Findings

Hypernuclear production cross sections differ significantly when using quark-meson coupling hyperon states.

The model accurately describes elementary gamma p to K+ Lambda reactions.

Differences from phenomenological wave functions are substantial in cross section predictions.

Abstract

We study the photoproduction of the ^12{_Lambda}B hypernucleus within a fully covariant effective Lagrangian based model, employing Lambda bound state spinors derived from the latest quark-meson coupling model. The kaon production vertex is described via creation, propagation and decay of N*(1650), N*(1710), and N*(1720) intermediate baryonic resonant states in the initial collision of the photon with a target proton in the incident channel. The parameters of the resonance vertices are fixed by describing the total and differential cross section data on the elementary gamma (p, K+) Lambda reaction in the energy regime relevant to the hypernuclear production. It is found that the hypernuclear production cross sections calculated with the quark model based hyperon bound state spinors differ significantly from those obtained with the phenomenological Dirac single particle wave functions.