The GIM Mechanism: origin, predictions and recent uses

TL;DR

This paper reviews the origin, predictions, and recent applications of the GIM Mechanism, a key concept in particle physics that explains suppression of certain processes and constrains theories beyond the Standard Model.

Contribution

It provides a comprehensive overview of the GIM Mechanism's development, its role in the Standard Model, and how FCNC processes serve as tests for new physics theories.

Findings

The GIM Mechanism explains suppression of neutral current processes.

FCNC processes impose strong limits on theories beyond the Standard Model.

Recent uses of the GIM Mechanism relate to testing new physics models.

Abstract

The GIM Mechanism was introduced by Sheldon L. Glashow, John Iliopoulos and Luciano Maiani in 1970, to explain the suppression of Delta S=1, 2 neutral current processes and is an important element of the unified theories of the weak and electromagnetic interactions. Origin, predictions and uses of the GIM Mechanism are illustrated. Flavor changing neutral current processes (FCNC) represent today an important benchmark for the Standard Theory and give strong limitations to theories that go beyond ST in the few TeV region. Ideas on the ways constraints on FCNC may be imposed are briefly described.