Particle physics

Particle physics

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Particle physics

parity

Physics; Particle physics

If a process is equally probable when the coordinates of space are reflected (as in a mirror), it is said to have parity symmetry.

parton

Physics; Particle physics

The constituents of protons and neutrons are quarks, gluons and anti-quarks. They are collectively known as partons.

parton distribution functions

Physics; Particle physics

These functions parameterize the composition (quarks, anti-quarks and gluons) of various hadrons. They describe the probability of finding a given constituent with a given momentum.

photon

Physics; Particle physics

The gauge boson that mediates the force of electromagnetism. The photon is the quantum of light.

pions

Physics; Particle physics

Pions are the lightest mesons. They are composed of up quarks, down quarks, and their anti-quark counterparts. Pions of charge +1, -1, and 0 are denoted pi + , pi - , and pi 0 , respectively.