The data tell us that the radius of the quark is smaller than 43 billion-billionths of a centimetre (0.43 x 10 −16 cm). It is, as one might expect, very small indeed. Having spent a long time understanding their data – in particular, in understanding how the quarks and gluons are distributed inside the proton – the ZEUS experiment has just released a new limit on the size of the quark. Unexpected changes in the cross section could be a sign that we are beginning to see a finite (non-zero) size for the quark. That’s just the theory though, we always want to check with an experiment, especially given how many gaps the Standard Model leaves in our understanding of fundamental physics.
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