Quarks are elementary particles that act as the tiny building blocks inside protons and neutrons, which in turn make up the atoms in all ordinary matter around you.

What quarks are

  • Quarks are considered elementary, meaning they are not made of anything smaller in the Standard Model of particle physics.
  • They combine in groups (mainly threes) to form particles called hadrons, including protons and neutrons in atomic nuclei.

Where quarks show up

  • Every atom’s nucleus is made of protons and neutrons, and each of those is built from quarks, so quarks underpin all visible matter you see and touch.
  • Mesons (another family of particles seen in cosmic rays and accelerators) are made of a quark and an antiquark bound together.

Types and charges

  • There are six “flavors” of quark: up, down, charm, strange, top, and bottom.
  • Up-type quarks carry a fractional electric charge of +2/3+2/3+2/3 and down-type quarks carry −1/3-1/3−1/3 of the electron’s charge, which is how combinations of them make the proton’s +1 and neutron’s 0 charge.

Weird properties

  • Quarks carry a special kind of charge called “color charge,” which makes them interact via the strong nuclear force and causes them to be permanently confined inside larger particles rather than flying around alone.
  • Because of this “color confinement,” isolated individual quarks have never been directly observed; experiments detect the hadrons they form or jets of particles produced when quarks are created at high energies.

Why quarks matter

  • Understanding quarks explains why protons and neutrons are stable, how nuclei hold together, and ultimately why ordinary matter has the structure it does.
  • Studying rare quark combinations and heavy flavors (like charm, bottom, and top) helps test the Standard Model and search for new physics in modern collider experiments.

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