Proton contains more anti-down quarks than anti-up – Physics World

Fermilab experiment charts the sea of short-lived particles inside protons

Properties of quarks - Wikiversity

What Rules The Proton: Quarks Or Gluons?

Mysterious X particles continue to puzzle Physicists

Quark - Wikipedia

New tool for proton spin

CERN Physicists Discover Four-Charm-Quark Particle, Physics

Particle physics: Surprise discovery reveals charm quark within the proton

quarks, leptons and antimatter

What Rules The Proton: Quarks Or Gluons?

Gravity is anti-Electromagnetism

Standard Model Archives - Page 2 of 2 - Regents Physics

quark