Leading-twist single-transverse-spin asymmetries: Drell–Yan and deep-inelastic scattering

By J. Collins. 2002

587 citations recorded by the source corpus.

Abstract Recently, Brodsky, Hwang and Schmidt have proposed a new mechanism that gives a transverse spin symmetry at leading twist in semi-inclusive deep-inelastic scattering. I show that the new mechanism is compatible with factorization and is due to a transverse-spin asymmetry in the kT distribution of quarks in a hadron (the “Sivers asymmetry”). An earlier proof that the Sivers asymmetry vanishes because of time-reversal invariance is invalidated by the path-ordered exponential of the gluon field in the operator definition of parton densities. Instead, the time-reversal argument shows that the Sivers asymmetry is reversed in sign in hadron-induced hard processes (e.g., Drell–Yan), thereby violating naive universality of parton densities. Previous phenomenology with time-reversal-odd parton densities is therefore validated.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e88baabc8e7415afeac05bf26f3b601278b87e03

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In Nuclear and High Energy Physics

Citations in the corpus

Elements of a theory for multiparton interactions in QCD (2011, background): “The time reversal invariance of strong interactions thus implies that T odd distributions are only nonzero thanks to Wilson line effects; a prominent example from spin physics is the Sivers distribution function [123].”
Parton distributions and lattice-QCD calculations: Toward 3D structure (2020, background): “The f⊥1T |DY = −f⊥1T |SIDIS prediction is based on very general assumptions, and it represents a fundamental test of QCD (Collins, 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”
Semi-inclusive deep inelastic scattering at small transverse momentum (2006, background): “3.1 Light-cone coordinates 6 3.2 Calculation of the hadronic tensor 6 3.3 The quark-quark correlators 8 3.4 The quark-gluon-quark correlators 13”
k T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions (2007, methodology): “As shown in [9], an exact reversal of sign of the Sivers function between SIDIS and DY follows from the time-reversal symmetry of QCD.”
Generalized parton correlation functions for a spin-0 hadron (2008, background): “ven and Xo the T-odd part of the generic GPCF X. The sign reversal of Xo in eq. (2.13) when going from future-pointing to past-pointing Wilson lines corresponds to the sign reversal discussed in ref. [36] for T-odd TMDs. Now we would like to give a ﬁrst account on the relation between GPCFs on the o”