Up Quark

Lightest of all quarks, fundamental constituent of protons and neutrons.

Core Principles & Analysis

• Proposed by Murray Gell-Mann and George Zweig in the 1964 quark model.
• Carries an electric charge of +2/3 e.
• Deep inelastic scattering at SLAC in 1968 gave the first direct evidence for quarks inside protons.

Specifications & Metrics

• MASS: 2.16 ± 0.07 MeV/c²
• SPIN: 1/2
• SYMBOL: u
• PDG ID: Q002
• PDG EDITION: PDG 2026
• CHARGE: +2/3 e

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