Toy parton distribution functions for the proton

What you are seeing: sketches of the longitudinal momentum fractions $x f_i(x)$ carried by each parton species. Valence quarks peak near $x \sim 0.2$ , sea quarks dominate at small $x$ , and the gluon carries the bulk of the proton momentum (about half at $Q^2 \sim 10$ GeV²).

Figure 1. Schematic

x f(x)

for valence, sea, and gluon partons.

x cursor0.200

x axis

WHAT TO TRY

Vary each control and watch the rail readouts respond.
Compare the diagnostic plot against the live scene.