Abstract
Recent EMC data on the spin-dependent proton structure function suggest that very little of the proton spin is due to the helicity of its constituent quarks. We argue that, at leading order in the 1 N c expansion, none of the proton spin would be carried by quarks in the chiral limit where m q=0. This result is derived in the Skyrme model, which is also used to estimate quark contribution to the proton spin when chiral symmetry and SU(3) are broken: this contribution turns out to be small. Therefore, even in the real world most of the proton spin is due to gluons and/or orbital angular momentum, as suggested by the EMC. We mention other experiments to test this suggestion.
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