Shapes of the Proton
Preprint
- 20 May 2003
Abstract
A model proton wave function, constructed using Poincare invariance, and constrained by recent electromagnetic form factor data, is used to study the shape of the proton. Spin-dependent quark densities are defined as matrix elements of density operators in proton states of definite spin-polarization, and shown to have an infinite variety of non-spherical shapes. For high momentum quarks with spin parallel to that of the proton, the shape resembles that of a peanut, but for quarks with anti-parallel spin the shape is that of a bagel.Keywords
All Related Versions
- Version 1, 2003-04-23, ArXiv
- Version 2, 2003-05-20, ArXiv
- Published version: Physical Review C, 68 (2).
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