Phys. Rev. C
78,
018201
(2008)
[4 pages]
Virtual Compton scattering measurements in the γ*N→Δ transition
N. F. Sparveris et al.
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N. F. Sparveris1,*, P. Achenbach2, C. Ayerbe Gayoso2, D. Baumann2, J. Bernauer2, A. M. Bernstein4, R. Böhm2, D. Bosnar5, T. Botto4, A. Christopoulou1, D. Dale6,†, M. Ding2, M. O. Distler2, L. Doria2, J. Friedrich2, A. Karabarbounis1, M. Makek5, H. Merkel2, U. Müller2, I. Nakagawa3, R. Neuhausen2, L. Nungesser2, C. N. Papanicolas1,‡, B. Pasquini8, A. Piegsa2, J. Pochodzalla2, M. Potokar7, M. Seimetz2, S. Širca7, S. Stave4,§, S. Stiliaris1, Th. Walcher2, and M. Weis2
1Institute of Accelerating Systems and Applications and Department of Physics, University of Athens, Athens, Greece 2Institut fur Kernphysik, Universität Mainz, Mainz, Germany 3Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan 4Department of Physics, Laboratory for Nuclear Science and Bates Linear Accelerator Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 5Department of Physics, University of Zagreb, Croatia 6Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40206, USA 7Institute Jožef Stefan, University of Ljubljana, Ljubljana, Slovenia, 8Dipartimento di Fisica Nucleare e Teorica, Università degli Studi di Pavia, and INFN, Sezione di Pavia, Pavia, Italy
Received 6 April 2008; published 21 July 2008
We report on new H(e,e'p)γ measurements in the Δ(1232) resonance at Q2=0.06 (GeV/c)2 carried out simultaneously with H(e,e'p)π0. It is the lowest Q2 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'p)π0 data are used as input, thus confirming the compatibility of the results. The derived resonant magnetic dipole amplitude M1+3/2=(40.60±0.70stat+sys)(10-3/mπ+) at W=1232 MeV is in excellent agreement with the value extracted from H(e,e'p)π0 measurements.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.018201
DOI:
10.1103/PhysRevC.78.018201
PACS:
14.20.Gk, 13.60.Le, 13.60.Fz, 14.20.Dh
*Current address: Massachusetts Institute of Technology. †Current address: Idaho State University, Department of Physics, Pocatello, Idaho 83209, USA. ‡Corresponding author: cnp@iasa.gr §Current address: Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA.
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