Single spin asymmetry AN in polarized proton–proton elastic scattering √s=200 GeV

L. Adamczyk, G. Agakishiev, S.L. La Pointe, M. Zyzak

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We report a high precision measurement of the transverse single spin asymmetry AN at the center of mass energy √s = 200 GeV in elastic proton–proton scattering by the STAR experiment at RHIC. The AN was measured in the four-momentum transfer squared t range 0.003 |t| 0.035 (GeV/c)2, the region of a significant interference between the electromagnetic and hadronic scattering amplitudes. The measured values of AN and its t-dependence are consistent with a vanishing 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 √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.
Original languageEnglish
Pages (from-to)62-69
Number of pages8
JournalPhysics Letters B
Issue number1-3
Publication statusPublished - 2013


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