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The scaling functions for purely electromagnetic interactions

If we now compare scattering on proton and neutron targets, and if we temporarily attach a label to the distributions to signify the hadron involved, then on the grounds of isospin invariance we expect [Pg.366]

reverting to the convention that no label refers to distributions in the proton, we have [Pg.366]

We would naturally expect the structure of a hadron to be dominated by its valence quarks—u and d for a nucleon. So we might expect the contribution from the sea to be small. But this cannot be true for all x as we saw from the discussion of B x) in Section 16.2. And QCD arguments indicate that the sea should become increasingly important for small x. [Pg.366]

With this in mind consider the ratio of scaling functions obtained from ep and en reactions  [Pg.367]

Since the distribution functions are positive one obtains the Nachtmann inequality  [Pg.367]


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