First Measurement of the Q2 Dependence of the Beam- Normal Single Spin Asymmetry for Elastic Scattering off Carbon (CROSBI ID 260117)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Esser, A. ; Thiel, M. ; Achenbach, P. ; Aulenbacher, K. ; Baunack, S. ; Beričič, J. ; Bosnar Damir ; Correa, L. ; Dehn, M. ; Distler, M.O. ; Fonvieille, H. ; Friščić, I. ; Gorchtein, M. ; Heidrich, S. ; Herrmann P. ; Hoek, M. ; Kegel, S. ; Kohl, Y. ; Kolar, T. ; Kreidel, H.-J. ; Maas, F.E. ; Merkel, H. ; Mihovilovič, M. ; Müller, J. ; Müller, U. ; Nillius, F. ; Palatchi, C. ; Paschke, K.D. ; Pochodzalla, J. ; Schlimme, S. ; Schot ; M. ; Schulz, F., Širca, S. ; Spruck, B. ; Štanjer, S. ; Tioukine, V. ; A. Tyukin ; Weber, A. ; Sfienti, C.
engleski
First Measurement of the Q2 Dependence of the Beam- Normal Single Spin Asymmetry for Elastic Scattering off Carbon
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.
Electron scattering, two-photon exchange
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Podaci o izdanju
121 (2)
2018.
022503
5
objavljeno
0031-9007
1079-7114
10.1103/PhysRevLett.121.022503
