2015/11/30 by STAR Collaboration, L. Adamczyk, J. K. Adkins +340 · 2 citations
Physics and Astronomy · #Asymmetry #Boson #Deep inelastic scattering #Distribution function #High-Energy Particle Collisions Research #Inelastic scattering #Lepton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Scattering #Transverse plane #hep-ex #nucl-ex
paper · pdf · doi:10.1103/physrevlett.116.132301
published as Phys. Rev. Lett. 116, 132301 (2016) · 7 pages, 4 figures, Submitted to Physical Review Letters
arxiv created 2016/02/19 · openalex publication_date 2016/04/01 · arxiv updated 2016/04/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at sqrt[s]=500 GeV by the STAR experiment at RHIC. The measured observable is sensitive to the Sivers function, one of the transverse-momentum-dependent parton distribution functions, which is predicted to have the opposite sign in proton-proton collisions from that observed in deep inelastic lepton-proton scattering. These data provide the first experimental investigation of the nonuniversality of the Sivers function, fundamental to our understanding of QCD.