Abstract

How can the spin 1/2 object known as the proton have a non-spherical shape? Why would a physicist even think of such a concept? Can a non-sphericity (or pretzelocity) be measured or computed? This article is concerned with such questions. The notion that the proton might not have a spherical shape has its impetus in the discovery that the spins of quarks and anti-quarks account for only about 30% of the total angular momentum [1]. Many experiments have sought the origins of the remainder, expected to arise from quark and gluon orbital angular momentum or from pairs of strange quarks.

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