Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Poster
HK 52.2: Poster
Thursday, March 1, 2018, 16:30–18:45, Audimax Foyer
Study of the transverse beam spin asymmetries at forward angles in e→-p scattering at A4 — D. Balaguer Ríos1, S. Baunack1,3, L. Capozza1, J. Diefenbach1,2, B. Gläser1,2, •B. Gou2, Y. Imai1,2, E.-M. Kabuß1, J.H. Lee1, F. Maas1,2,3, M. C. Mora Espí1,2, E. Schilling1, D. von Harrach1, and C. Weinrich1 — 1Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — 2Helmholtz-Institut Mainz — 3PRISMA Cluster of Excellence, Johannes Gutenberg-Universität Mainz
The one-photon exchange approximation in the electron-nucleon scattering had been regarded as sufficient in probing the nucleon structure, until the discrepancy between the Rosenbluth separation and the polarization transfer methods in measuring the proton form factor ratio arose. The two-photon exchange process has been proposed to account for this discrepancy. It is imperative to study the two-photon exchange amplitudes quantitatively, in order to understand how the two-photon exchange process may affect various observables. The imaginary parts of the two-photon exchange amplitudes are accessible via the single normal spin asymmetries in the polarized electron-nucleon scattering. The A4 collaboration has embarked on a systematic study of the transverse beam spin asymmetries in the intermediate energy regime using polarized electron beams scattering on hydrogen/deuterium targets. Measurements have been performed at both forward and backward angles at energies between 210 MeV and 1.5 GeV. In this poster we present the investigation of the forward measurements.