K-Matrix Formalism in Hadron Physics

This repository contains educational materials focused on the application of the \(K\)-matrix formalism in the field of hadron physics. The materials are designed to bridge theoretical concepts with practical examples, facilitating a deeper understanding of scattering amplitude observables and resonance phenomena.

Contents

The core of this repository are the following interactive notebooks:

• Pluto notebook with interactive K-matrix widget (Julia)

• Analyticity: Single-channel Riemann sheets (Python)

• Analyticity: Coupled channel Riemann sheets (Python)

Supplementary materials, including lecture notes and presentations, can be found here:

2. Second talk: Analytic continuation within K-matrix formalism (Lena Zeynep Pöpping)

Installation Instructions

To run the materials in this repository locally, clone the repository using:

git clone https://github.com/rub-ep1/international-k-matrix-day

This course utilizes Pluto notebooks, which requires Julia, and Jupyter notebooks, which requires Python. You can install and run Pluto and Jupyter yourself, but you can also use the provided Pixi environment.

1. Install Pixi:

   Linux / macOS

   curl -fsSL https://pixi.sh/install.sh | bash
   

   Powershell

   iwr -useb https://pixi.sh/install.ps1 | iex
   

   Winget

   winget install prefix-dev.pixi
   

2. Run one of the Pixi tasks:

   pixi run lab
   

   pixi run pluto
   

   Warning

   The first time you run pixi run pluto, it can take a few minutes before all Julia packages are downloaded and installed.