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  • Letter
  • Open Access

Power counting to saturation

Iain W. Stewart1 and Varun Vaidya2

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Phys. Rev. D 110, L011504 – Published 23 July, 2024

DOI: https://doi.org/10.1103/PhysRevD.110.L011504

Abstract

We present a description of saturation in small x deep inelastic scattering from power counting in a top-down effective theory derived from quantum chromodynamics (QCD). A factorization formula isolates the universal physics of the nucleus at leading power in x. The onset of saturation is then understood as a breakdown in the expansion in an emergent power counting parameter, which is defined by the matrix element of a gauge invariant operator. We identify a new radiation mode, which enables us to extend previous literature by distinguishing the appearance of the saturation scale from the transition to nonlinear evolution.

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Phys. Rev. D 110, L011504– Published 23 July, 2024
  • Received 20 August 2023
  • Accepted 24 June 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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