First Measurement of the Q2 Dependence of the Beam-Normal Single Spin Asymmetry for Elastic Scattering off Carbon

Esser, A. and Thiel, M. and Achenbach, P. and Aulenbacher, K. and Baunack, S. and Beričič, J. and Bosnar, Damir and Correa, L. and Dehn, M and Distler, M. O. and Fonvieille, H. and Friščić, Ivica and Gorchtein, M. and Heidrich, S. and Hermann, P. and Hoek, M. and Kegel, S. and Kohl, Y. and Kolar, T. and Kreidel, H.-J. and Maas, F. E. and Merkel, H. and Mihovilovič, M. and Müller, J. and Müller, U. and Nillius, F. and Palatchi, C. and Paschke, K. D. and Pochodzalla, J. and Schlimme, B. S. and Schoth, M. and Schulz, F. and Širca, S. and Spruck, B. and Štajner, S. and Tioukine, V. and Tyukin, A. and Weber, A. and Sfienti, C. (2018) First Measurement of the Q2 Dependence of the Beam-Normal Single Spin Asymmetry for Elastic Scattering off Carbon. Physical Review Letters, 121 (2). pp. 22503-6. ISSN 0031-9007

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Abstract

We report on the first Q2-dependent measurement of the beam-normal single spin asymmetry An in the elastic scattering of 570 MeV vertically polarized electrons off 12C. We cover the Q2 range between 0.02 and 0.05 GeV2=c2 and determine An at four different Q2 values. The experimental results are compared to a theoretical calculation that relates An to the imaginary part of the two-photon exchange amplitude. The result emphasizes that the Q2 behavior of An given by the ratio of the Compton to charge form factors cannot be treated independently of the target nucleus.

Item Type: Article
Date: 2018
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2018 American Physical Society. Received 13 March 2018; revised manuscript received 27 May 2018; published 11 July 2018.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 12 Sep 2018 08:56
Last Modified: 12 Sep 2018 08:56
URI: http://digre.pmf.unizg.hr/id/eprint/5860

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