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Friščić, I.; Achenbach, P.; Ayerbe Gayoso, C.; Baumann, D.; Böhm, R.; Bosnar, D.; Debenjak, L.; Denig, A.; Ding, M.; Distler, M.O.; Esser, A.; Merkel, H.; Middleton, D.G.; Mihovilovič, M.; Müller, U.; Pochodzalla, J.; Schlimme, B.S.; Schoth, M.; Schulz, F.; Sfienti, C.; Širca, S.; Thiel, M.; Walcher, Th
Physics letters. B, 03/2017, Volume: 766, Issue: CJournal Article
The cross section of the p(e,e′π+)n reaction has been measured for five kinematic settings at an invariant mass of W=1094 MeV and for a four-momentum transfer of Q2=0.078 (GeV/c)2. The measurement has been performed at MAMI using a new short-orbit spectrometer (SOS) of the A1 collaboration, intended for detection of low-energy pions. The transverse and longitudinal cross section terms were separated using the Rosenbluth method and the transverse-longitudinal interference term has been determined from the left-right asymmetry. The experimental cross section terms are compared with the calculations of three models: DMT2001, MAID2007 and χMAID. The results show that we do not yet understand the dynamics of the fundamental pion.
