Global analysis of the Sivers functions at NLO+NNLL in QCD

A bstract We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair produ...

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Bibliographic Details
Published in:The journal of high energy physics 2021-01, Vol.2021 (1), p.1-47, Article 126
Main Authors: Echevarria, Miguel G., Kang, Zhong-Bo, Terry, John
Format: Article
Language:English
Subjects:
Asymmetry
Bosons
Classical and Quantum Gravitation
Electron spin
Elementary Particles
Evolution
High energy physics
Inelastic scattering
Leptons
Pair production
Physics
Physics and Astronomy
QCD Phenomenology
Quantum chromodynamics
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativistic Heavy Ion Collider
Relativity Theory
String Theory
Transverse momentum
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Summary:A bstract We perform global fit to the quark Sivers function within the transverse momentum dependent (TMD) factorization formalism in QCD. We simultaneously fit Sivers asymmetry data from Semi-Inclusive Deep Inelastic Scattering (SIDIS) at COMPASS, HERMES, and JLab, from Drell-Yan lepton pair production at COMPASS, and from W/Z boson at RHIC. This extraction is performed at next-to-leading order (NLO) and next-to-next-to leading logarithmic (NNLL) accuracy. We find excellent agreement between our extracted asymmetry and the experimental data for SIDIS and Drell-Yan lepton pair production, while tension arises when trying to describe the spin asymmetries of W/Z bosons at RHIC. We carefully assess the situation, and we study in details the impact of the RHIC data and their implications through different ways of performing the fit. In addition, we find that the quality of the description of W/Z vector boson asymmetry data could be strongly sensitive to the DGLAP evolution of Qiu-Sterman function, besides the usual TMD evolution. We present discussion on this and the implications for measurements of the transverse-spin asymmetries at the future Electron Ion Collider.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP01(2021)126