Hadron Hold'em

It plays like Texas Hold'em, so if you know poker, the betting is exactly the same. New to it? Here's the gist: everyone gets two private cards, five shared cards flip face-up over a few rounds, and you bet a little at each step. The only twist is how you win. Forget pairs and straights, you build a real particle out of your cards, and the better the particle, the bigger the pot.

What beats what

The one rule: a particle has to be color-neutral. Here is every hand in order, weakest to strongest. In each recipe a ring u is a quark, a filled dot d̄ is an antiquark, and a gray ring e is a lepton. Colors are color charge and letters are flavor. Ties go to the heavier particle, then your heaviest remaining cards; five cards play, like poker.

The % is how often you'll make each hand, not its strength. So the Meson and Baryon are the hands you'll land most often, yet they sit low on the ladder, much like One Pair in poker.

Quarkonium is the game's name for any same-flavor pair; physicists use it for the heavy ones.

Four cards are wild. Three are gluons, the carriers of the strong force, the glue between quarks. Each fills in for any quark or antiquark but keeps its own color (red, green, or blue), so it completes a particle's missing color slot. Because it's color-locked, a gluon can finish a proton but can't fake a same-flavor pair, so Quarkonium stays earned.

The fourth wild is the Higgs: colorless, it fills any flavor and any color, the one truly universal wild (fittingly, the Higgs field is what gives the fundamental particles their mass). Predicted in 1964 and found at CERN's Large Hadron Collider in 2012, it was the last missing piece of the Standard Model, and earned Higgs and Englert the 2013 Nobel Prize. Its nickname, the “God particle,” comes from a 1993 book (most physicists think it's a bit much).

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⚛ The physics behind it

None of these rules were invented for the game. They're how particle physics actually works, and the 52-card deck is a map of it.

Zoom into anything: your hand, this screen, a distant star. First you find molecules, then atoms, then a tiny nucleus circled by electrons. Break the nucleus open and you get protons and neutrons. Break those open and you reach the bottom layer, the quarks. The electrons circling outside don't split into anything either, so together they make the two fundamental families: quarks and leptons. The Standard Model is the rulebook for that layer.

One rule runs the whole game, and physicists call it confinement. Every quark carries a color charge of red, green, or blue, and nature never lets a colored thing sit on its own. Quarks only appear in color-neutral teams: all three colors together, since red plus green plus blue makes white, or a color paired with its anti-color. That is why every winning hand has to be color-neutral, and why a lone quark is worth nothing (your High Card). The glue holding a team together is the strong force, carried by gluons, three of your four wild cards (the fourth is the Higgs).

Put a color-neutral particle together to win a pot and you're doing the same thing the universe does to build matter. Adapted from Helio Takai and Akshay Gupta's original Quark Card Game (Brookhaven National Lab, MARIACHI).

Standard Texas Hold'em: each player gets 2 hole cards, five community cards are dealt across the flop, turn and river, and you make your best 5-card poker hand. Bet, call, raise or fold each street. Last player standing, or the best hand at showdown, wins.