Measurement of the p(e,e′π+)n reaction close to threshold and at low Q2 (CROSBI ID 289253)
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Podaci o odgovornosti
Friščić, I. ; Achenbach, P. ; Gayoso, C. Ayerbe ; Baumann, D. ; Boehm, R. ; Bosnar, D. ; Debenjak, L. ; Denig, A. ; Ding, M. ; Distler, M. O. ; Esser, A. ; Merkel, H. ; Middleton, D. G. ; Mihovilovic, M. ; Mueller, U. ; Pochodzalla, J. ; Schlimme, B. S. ; Schoth, M. ; Schulz, F. ; Sfienti, C. ; Sirca, S. ; Thiel, M. ; Walcher, Th.
engleski
Measurement of the p(e,e′π+)n reaction close to threshold and at low Q2
The cross section of the p(e, e′π+)nreaction 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.
Short-orbit spectrometer ; Low-energy pions ; Electroproduction experiments
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