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The Shape of Hadrons
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abstract
This colloquium addresses the issue of the shape of hadrons and in particular that of the proton. The concept of shape in the microcosm is critically examined. Special attention is devoted to properly define the meaning of shape for bound-state systems of near massless quarks. The ideas that lead to the expectation of non-sphericity in the shape of hadrons, the calculations that predict it, and the experimental information obtained from recent high-precision measurements are examined. Particular emphasis is given to the study of the electromagnetic transition between the nucleon and its first excited state, the $\Delta$(1232)-resonance. The experimental evidence is is critically examined and compared with lattice calculations, as well as with effective-field theories and phenomenological models.
Forward citations
Cited by 2 Pith papers
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Multipole structure of the $N \to \Delta$ Transition Generalized Parton Distributions
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Covariant analysis of electromagnetic current on the light cone: exposition with scalar Yukawa theory
Adding an antinucleon Fock component, even at only ~2% probability, dramatically reduces the frame dependence of the charge form factor in strongly coupled scalar Yukawa theory on the light front.
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