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27 April 2024

» arxiv » 0804.1169

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Virtual Compton Scattering measurements in the $gamma^* N o Delta$ transition
N.F. Sparveris ; P. Achenbach ; C. Ayerbe Gayoso ; D. Baumann ; J. Bernauer ; A.M. Bernstein ; R. Böhm ; D. Bosnar ; T. Botto ; A. Christopoulou ; D. Dale ; M. Ding ; M.O. Distler ; L. Doria ; J. Friedrich ; A. Karabarbounis ; M. Makek ; H. Merkel ; U. Müller ; I. Nakagawa ; R. Neuhausen ; L. Nungesser ; C.N. Papanicolas ; B. Pasquini ; A. Piegsa ; J. Pochodzalla ; M. Potokar ; M. Seimetz ; S. Širca ; S. Stave ; S. Stiliaris ; Th. Walcher ; M. Weis ;
Date:	8 Apr 2008
Abstract:	We report on new H$(e,e^prime p)gamma$ measurements in the $Delta(1232)$ resonance at $Q^2=0.06$ (GeV/c) carried out simultaneously with H$(e,e^prime p)pi^0$. It is the lowest $Q^2$ for which the virtual Compton scattering (VCS) reaction has been studied in the first resonance region. The VCS measured cross sections are well described by dispersion-relation calculations in which the multipole amplitudes derived from H$(e,e^prime p)pi^0$ data are used as input, thus confirming the compatibility of the results. The derived resonant magnetic dipole amplitude $M^{3/2}_{1+} = (40.60 pm 0.70_{stat+sys})(10^{-3}/m_{pi^+})$ at $W=$ 1232 MeV is in excellent agreement with the value extracted from H$(e,e^prime p)pi^0$ measurements.
Source:	arXiv, 0804.1169
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