Abstract
Scattering of Majorana-Weyl neutrinos off confined quarks is described in a Lorentz-invariant way. The almost maximal parity violation observed demonstrates that valence quarks dominate over sea quarks, i.e. mesons. The deep inelastic structure functions derive from the quark Fermi motion, with the constituent quark mass m q as a parameter. The softening of the valence quark momentum distribution, observed in complex nuclei (EMC-effect), is interpreted as partial de-confinement. This may be due to part of the quarks moving in enlarged bags, e.g. 12 q = α-clusters.
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