On a possible node in the Sivers and Qiu-Sterman functions

Abstract

The possibility of a node in the x dependence of the Sivers and Qiu-Sterman functions is discussed in light of its importance for the experimental check of the overall sign change of the Sivers effect between semi-inclusive DIS and the Drell-Yan process. An x-dependent version of the Ehrnsperger-Schaefer-Greiner-Mankiewicz relation between the Qiu-Sterman function and a twist-3 part of g_2 is presented, which naturally suggests a node in the Qiu-Sterman function. This relation could be checked experimentally as well and could provide qualitative information on the gluonic field strength inside the proton. Satisfying the Burkardt sum rule by means of a node is briefly discussed and the importance of modelling the Sivers function including its full Wilson line is pointed out.

6 pages, no figures, various modifications, mainly concerning flavor dependence

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Cited by in corpus (15)

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• Extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm }/Z$ boson production data with TMD evolution
• Single-spin asymmetries in inclusive deep inelastic scattering and multiparton correlations in the nucleon
• Global fitting of single spin asymmetry: an attempt
• Exploring the structure of the proton through polarization observables in l p \to jet X
• N${}^3$LO extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm }/Z$ data
• Extra Spin Asymmetries From the Breakdown of TMD-Factorization in Hadron-Hadron Collisions
• Single spin asymmetries in forward p-p/A collisions revisited: the role of color entanglement
• Drell-Yan hadron tensor: contour gauge and gluon propagator
• Drell-Yan-like processes and duality
• Single Transverse Spin Asymmetries in Semi-inclusive Deep Inelastic Scattering in a Spin-1 Diquark Model
• ECCE unpolarized TMD measurements
• Aspects of TMD evolution of azimuthal asymmetries
• Gluon poles and photon distribution amplitudes in Drell-Yan-like processes
• Angular distributions in pion-nucleon Drell-Yan process