Single Spin Asymmetries from a Single Wilson Loop

Daniel Boer*, Miguel G. Echevarria, Piet J. Mulders, Jian Zhou

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

35 Citations (Scopus)

Abstract

We study the leading-power gluon transverse-momentum-dependent distributions (TMDs) of relevance to the study of asymmetries in the scattering off transversely polarized hadrons. Next-to-leading-order perturbative calculations of these TMDs show that at large transverse momentum they have common dynamical origins but that in the limit of a small longitudinal momentum fraction x, only one origin remains. We find that in this limit, only the dipole-type gluon TMDs survive and become identical to each other. At small x, they are all given by the expectation value of a single Wilson loop inside the transversely polarized hadron, the so-called spin-dependent odderon. This universal origin of transverse spin asymmetries at small x is of importance to current and future experimental studies, paving the way to a better understanding of the role of gluons in the three-dimensional structure of spin-polarized protons.

Original languageEnglish
Article number122001
Number of pages6
JournalPhysical Review Letters
Volume116
Issue number12
DOIs
Publication statusPublished - 21-Mar-2016

Keywords

  • COLOR GLASS CONDENSATE
  • POLARIZED PROTON-BEAM
  • ANALYZING POWER
  • ODDERON
  • APPROXIMATION
  • QCD

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