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

Adamczyk, L. and Poljak, Nikola and Planinić, Mirko and Zyzak, M. (STAR Collaboration) (2013) Single spin asymmetry AN in polarized proton–proton elastic scattering at √s = 200 GeV. Physics Letters B, 719 (1-3). pp. 62-69. ISSN 0370-2693

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Abstract

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.

Item Type: Article
Keywords: spin, asymmetry, proton, 200GeV, STAR
Date: 12 February 2013
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: Elsevier
Depositing User: Nikola Poljak
Date Deposited: 09 Feb 2015 20:06
Last Modified: 23 Feb 2016 15:28
URI: http://digre.pmf.unizg.hr/id/eprint/3660

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