Quark and lepton masses

TL;DR

This paper reviews the current understanding of quark and lepton masses, summarizes experimental data, and discusses theoretical attempts to explain their mass patterns based on unknown fundamental principles.

Contribution

It provides a comprehensive overview of existing data and explores various theoretical approaches to explain the origin of fermion mass patterns.

Findings

Summarizes experimental data on quark and lepton masses.

Reviews main theoretical models explaining mass patterns.

Highlights the need for a fundamental principle underlying mass generation.

Abstract

Quarks and leptons, the fundamental building blocks of the subatomic world, manifest in three families - replicas with identical quantum numbers that differ only in their masses. After summarizing the present data, an overview is presented of the main attempts to explain the origin of the observed patterns and trace it back to an as-yet-unknown fundamental principle.