Studies of the Roper Resonance by the Ljubljana Group

TL;DR

This paper reviews the Ljubljana group's efforts, both theoretical and experimental, to understand the complex nature of the N*(1440) Roper resonance, a longstanding puzzle in hadronic physics.

Contribution

It provides a comprehensive overview of the group's research contributions to elucidating the properties of the Roper resonance since the late 1990s.

Findings

Insights into the structure of the Roper resonance

Experimental data supporting theoretical models

Progress in understanding nucleon excitations

Abstract

Ever since its discovery in 1964 the nature of the N*(1440) nucleon resonance has been a perpetual and one of the outstanding puzzles in hadronic physics. The Ljubljana group joined the global effort in the late 1990s, first from the theoretical viewpoint and later experimentally. This paper is a short overview of our attempts to understand this elusive resonance.