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Color transparency and the proton form factor: Evidence for the Feynman mechanism

Olivia Caplow-Munro* and Gerald A. Miller†

  • Department of Physics, University of Washington, Seattle, Washington 98195, USA

  • *petryolivia@gmail.com
  • †miller@uw.edu

Phys. Rev. C 104, L012201 – Published 13 July, 2021

DOI: https://doi.org/10.1103/PhysRevC.104.L012201

Abstract

A recent experiment by D. Bhetuwal et al. [Phys. Rev. Lett. 126, 082301 (2021)] used the (e,e′p) reaction on C12 to search for the effects of color transparency (the absence of final-state interactions). Color transparency was said to be ruled out. Observing the effects of color transparency depends on the ability of a putative point-like-configuration (PLC), formed in a high-momentum transfer coherent reaction, to escape the nucleus without expanding its size. We study the expansion aspect of color transparency using superconformal baryon-meson symmetry and light-front holographic QCD. A new formalism is obtained and used to analyze the recent experiment. The resulting conclusion is that effects of expansion would not be sufficiently significant in causing final-state interactions to occur. Therefore, we conclude that a PLC was not formed. This means that the Feynman mechanism involving virtual photon absorption on a single high-momentum quark is responsible for the high-momentum electromagnetic form factor of the proton.

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