Hadron Brawler: Strong Nuclear Force / Quantum Chromodynamics
Nuclear & Particle Physics arc, page 170 of 193. Back to The Pixelated Physics Universe
Who they are
Try to pull a quark loose and the universe refuses. Quantum chromodynamics: gluons bind quarks so tightly they are never seen alone, only inside hadrons like protons. Hadron Brawler wears it in pixel art on a unisex tee.
Hadron Brawler is a character of the Nuclear & Particle Physics arc: drawn in pixels, ruled by one piece of real physics, and never allowed to break it.
The physics
The Cornell potential describes the force between a heavy quark and antiquark: Coulomb-like at short range, with an extra term that grows steadily with distance. That linear term, like a stretched string, is why quarks can never be pulled out of a hadron alone.
$$ \begin{gathered} V(r) = -\frac{4}{3}\frac{\alpha_s \hbar c}{r} + \sigma r \end{gathered} $$
| Symbol | Meaning | SI unit |
|---|---|---|
| $V(r)$ | static quark–antiquark potential (Cornell form) | J |
| $\alpha_s$ | strong coupling | 1 |
| $\hbar c$ | reduced Planck constant × c | J·m |
| $r$ | quark separation | m |
| $\sigma$ | string tension (quoted in GeV/fm) | J/m |
Sources
- Eichten et al. (1975) Spectrum of Charmed Quark-Antiquark Bound States, PRL 34, 369
- PDG 2024 review — Quantum Chromodynamics
- Encyclopaedia Britannica — Strong force
- NobelPrize.org — The Nobel Prize in Physics 2004 (asymptotic freedom)
Crossovers
Hadron Brawler meets Quarkbinders (Quantum Chromodynamics / Strong Nuclear Force). Quarkbinders gives quarks their three colours. Hadron Brawler shows the result: the strong force grows with distance, so coloured quarks are only ever found inside colour-neutral hadrons.
Hadron Brawler meets Glueba (Yang–Mills and the Mass Gap). Hadron Brawler's confinement is observed. Glueba asks for proof that pure Yang–Mills theory has a mass gap, which is unsolved.
Hadron Brawler meets Corekeeper (Strong Nuclear Force / Nuclear Binding). Corekeeper's nuclear binding is a residual of Hadron Brawler's strong force: colour-neutral nucleons still attract at femtometre range, enough to beat proton repulsion.
Wear the lore
Concept keywords: Strong Nuclear Force / Quantum Chromodynamics, Hadron Brawler, Nuclear & Particle Physics, physics lore, Pixelated Physics