212 articles – 1958 references  [version française]
 HAL: in2p3-00707109, version 1
 arXiv: 1206.1928
 Physics Letters B 719 (2013) 62-69
 Single Spin Asymmetry $A_N$ in Polarized Proton-Proton Elastic Scattering at $\sqrt{s}=200$ GeV
 For the STAR collaboration(s)
 (2013)
 We report a high precision measurement of the transverse single spin asymmetry $A_N$ at $\sqrt{s}=200$ GeV in elastic proton-proton scattering by the STAR experiment at RHIC. The $A_N$ was measured in the four-momentum transfer $t$ range $0.003 \leqslant |t| \leqslant 0.035$ $\GeVcSq$, the region of a significant interference between the electromagnetic and hadronic scattering amplitudes. The measured values of $A_N$ and its $t$-dependence are consistent with the absence of a hadronic spin-flip amplitude, thus providing strong constraints on the ratio of the single spin-flip to the non-flip amplitudes. Since the hadronic amplitude is dominated by the Pomeron amplitude at this $\sqrt{s}$, we conclude that this measurement addresses the question about the presence of a hadronic spin flip due to the Pomeron exchange in polarized proton-proton elastic scattering.
 Subject(s) : Physics/High Energy Physics - ExperimentPhysics/Nuclear Experiment