Measurement of the p(e,e′π+)n reaction close to threshold and at low Q2

Friščić, Ivica and Achenbach, P. and Gayoso, C. Ayerbe and Baumann, D. and Böhm, R. and Bosnar, Damir and Debenjak, L. and Denig, A. and Ding, M. and Distler, M.O. and Esser, A. and Merkel, H. and Middleton, D.G. and Mihovilovič, M. and Müller, U. and Pochodzalla, J. and Schlimme, B.S. and Schoth, M. and Schulz, F. and Sfienti, C. and Širca, S. and Thiel, M. and Walcher, Th. (2017) Measurement of the p(e,e′π+)n reaction close to threshold and at low Q2. Physics Letters B, 766. 301 -305. ISSN 0370-2693

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Abstract

The cross section of the p(e,e′π+)n reaction has been measured for five kinematic settings at an invariant mass of W=1094MeV 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.

Item Type: Article
Keywords: short-orbit spectrometer, low-energy pions, electroproduction experiments
Date: 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3
Divisions: Faculty of Science > Department of Physics
Publisher: Elsevier
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 Nov 2017 20:00
Last Modified: 29 Nov 2017 17:30
URI: http://digre.pmf.unizg.hr/id/eprint/5728

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