FINAL-STATE INTERACTIONS AND SINGLE-SPIN ASYMMETRIES IN SEMI-INCLUSIVE DEEP INELASTIC SCATTERING

By S. Brodsky, D. Hwang, I. Schmidt. 2002

448 citations recorded by the source corpus.

Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries AUL and AUT of the proton in semi-inclusive pion leptoproduction γ*(q) p → π X. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system leads to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality q2 at fixed xbj. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with $J^z_p =\pm \frac{1}{2}$ to the same final-state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb-like complex phase which depends on the angular momentum Lz of the proton's constituents and ...

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b1ef87b6b22b561ef7bb25e18bac79d8bbf6dd6a

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In Nuclear and High Energy Physics

1. Guy F. de Téramond
2. A. Deur
3. S. Brodsky
4. Hans Günter Dosch
5. J. Erlich

Citations in the corpus

• The QCD running coupling (2016, methodology): “An example is the calculation of the Sivers function [140] encountered in single-spin pseudoT-odd semi-inclusive DIS.”
• Parton distributions and lattice-QCD calculations: Toward 3D structure (2020, unknown): “28 (Brodsky et al., 2002).”
• Nonperturbative QCD coupling and its β function from light-front holography (2010, background): “This includes the rescattering (final-state and initial-state interactions) which create the leading-twist Sivers single-spin correlations in semi-inclusive deep inelastic scattering, [63, 64] the Boer-Mulders functions which lead to anomalous cos 2φ contributions to the lepton pair angular distribu”