Measurement of the G asymmetry for the gamma p -> N pi channels in the Delta(1232) resonance region

ISSN
1434-601X
1434-6001
Date Issued
2005
Author(s)
Ahrens, J.
Altieri, S.
Annand, JRM
Arends, H. J.
Beck, R.
Braghieri, A.
d'Hose, N.
Dutz, H.
Goertz, S.
Grabmayr, P.
Hasegawa, S.
Heid, E.
Holvoet, H.
van Hoorebeke, L.
Horikawa, N.
Iwata, T.
Jennewein, P.
Kondratiev, R.
Krimmer, J.
Lang, M.
Lannoy, B.
Livingston, K.
McGeorge, J. C.
Meyer, Werner
Panzeri, A.
Pedroni, P.
Pinelli, T.
Preobrajenski, I.
Reicherz, G.
Rosner, G.
Rost, M.
Rostomyan, T.
Ryckbosch, D.
Schumacher, M.
Seitz, Bjoern
Tamas, Gabor
Thomas, Andy
de Vyver, R.
Walcher, T.
Zapadtka, F.
DOI
10.1140/epja/i2005-10158-3
Abstract
The G asymmetry of the gamma p -> N pi reaction has been measured for the first time for E gamma = 340 +/- 14 MeV. This observable, for which very scarce published data exist, plays an important role to disentangle the contributions of the various nucleon resonances. The experiment, performed at the Mainz microtron MAIM, used a 4 pi-detector system, a linearly polarized, tagged photon beam, and a longitudinally polarized proton target.