Abstract
We prove that in a parton model which incorporates confinement there exists a subtle connection between analyticity of the virtual Compton amplitude and unitarity with quarks. Then we show that the experimental data on\(\nu \bar W_2 \) for pions and νW2 for nucleons indicatein our model an exactly zero free mass of at least one of the u or d quarks. This turns out, also, to be essential to understand the accepted behaviour of the pion electromagnetic form factor.
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