Abstract
Quarks and leptons have emerged as elementary constituents of matter. To these may perhaps be added the field particles, or mediating agents, of a unified theory of the weak and electromagnetic forces and also those of a new theory of the strong (nuclear) force. This article briefly outlines some of the main items of evidence for this new picture and indicates a few of the many crucial questions to be answered.
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Mulvey, J. The new frontier of particle physics. Nature 278, 403–409 (1979). https://doi.org/10.1038/278403a0
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DOI: https://doi.org/10.1038/278403a0
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