Measurement of the $p(e,e'\pi^+)n$ reaction close to threshold and at low $Q^2$

A1 Collaboration: I. Fri\v{s}\v{c}i\'c; A. Denig; A. Esser; B. S. Schlimme; C. Ayerbe Gayoso; C. Sfienti; D. Baumann; D. Bosnar; D. G. Middleton; F. Schulz

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

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arxiv 1606.00970 v3 pith:2D4ICRGK submitted 2016-06-03 nucl-ex

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

A1 Collaboration: I. Fri\v{s}\v{c}i\'c , P. Achenbach , C. Ayerbe Gayoso , D. Baumann , R. B\"ohm , D. Bosnar , L. Debenjak , A. Denig

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M. Ding M. O. Distler A. Esser H. Merkel D. G. Middleton M. Mihovilovi\v{c} U. M\"uller J. Pochodzalla B. S. Schlimme M. Schoth F. Schulz C. Sfienti S. \v{S}irca M. Thiel Th. Walcher

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The cross section of the $p(e,e'\pi^+)n$ reaction has been measured for five kinematic settings at an invariant mass of $W = 1094$ MeV and for a four-momentum transfer of $Q^2 = 0.078$ (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 $\chi$MAID. The results show that we do not yet understand the dynamics of the fundamental pion.

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