Abstract
A quark-diquark model of the nucleon is considered and the value of the Gottfried sum ruleS G , recently measured by the NMC group and found to differ considerably from the quark parton model expectation,S G =1/3, is computed allowing for both elastic and inelastic contributions from the diquarks. This approach fails to reproduce the data, unless vector diquark contributions persist at very largeQ 2 values, contrary to the usual assumptions. The Bjorken sum rule andSU(6) violations due to the quark-diquark structure of the nucleon are also briefly discussed.
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Work supported in part by Ministero dell'Università e della Ricerca Scientifica e Tecnologica
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Anselmino, M., Barone, V., Caruso, F. et al. Gottfried and Bjorken sum rules: The role of vector diquarks. Z. Phys. C - Particles and Fields 55, 97–100 (1992). https://doi.org/10.1007/BF01558293
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DOI: https://doi.org/10.1007/BF01558293