New Measurements of the Beam Normal Spin Asymmetries at Large Backward Angles with Hydrogen and Deuterium Targets

• Main Authors: Ríos, D. Balaguer (Author), Aulenbacher, K. (Author), Baunack, S. (Author), Diefenbach, J. (Author), Gläser, B. (Author), von Harrach, D. (Author), Imai, Y. (Author), Kabuß, E.-M (Author), Kothe, R. (Author), Lee, J. H (Author), Merkel, H. (Author), Mora Espí, M. C (Author), Müller, U. (Author), Schilling, E. (Author), Weinrich, C. (Author), Capozza, L. (Author), Maas, F. E (Author), Arvieux, J. (Author), El-Yakoubi, M. A (Author), Frascaria, R. (Author), Kunne, R. (Author), Morlet, M. (Author), Ong, S. (Author), van de Wiele, J. (Author), Kowalski, Stanley B (Contributor), Prok, Yelena (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society (APS), 2018-06-26T19:19:53Z.
• Subjects: Article
• Online Access: Get fulltext

New measurements of the beam normal single spin asymmetry in the electron elastic and quasielastic scattering on the proton and deuteron, respectively, at large backward angles and at Q2=0.22 (GeV/c)2 and Q2=0.35 (GeV/c)2 are reported. The experimentally observed asymmetries are compared with the theoretical calculation of Pasquini and Vanderhaeghen [Phys. Rev. C 70, 045206 (2004).PRVCAN0556-281310.1103/PhysRevC.70.045206]. The agreement of the measurements with the theoretical calculations shows a dominance of the inelastic intermediate excited states of the nucleon, πN and the Δ resonance. The measurements explore a new, important parameter region of the exchanged virtual photon virtualities.