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Coherent pi<sup>0</sup> threshold production from the deuteron at Q<sup>2</sup>=0.1 GeV<sup>2</sup>/c<sup>2</sup>

By I. Ewald, P. Bartsch, D. Baumann, J. Bermuth, A.M. Bernstein, K. Bohinc, R. Bohm, N. Clawiter, S. Derber, M. Ding, M.O. Distler, J. Friedrich, J.M. Friedrich, M. Kahrau, M. Kohl, A. Kozlov, K.W. Krygier, A. Liesenfeld, H. Merkel, P. Merle, U. Muller, R. Neuhausen, M. Pavan, T. Pospischil, M. Potokar, D. Rohe, G. Rosner, H. Schmieden, S. Sirca, A. Wagner, T. Walcher and M. Weis

Abstract

First data on coherent threshold pi (0) electroproduction from the deuteron taken by the Al Collaboration at the Mainz Microtron MAMI are presented. At a four-momentum transfer of q(2) = -0.1GeV(2)/c(2) the full solid angle was covered up to a center-of-mass energy of 4 MeV above threshold, By means of a Rosenbluth separation the longitudinal threshold s wave multipole and an upper limit for the transverse threshold s wave multipole could be extracted and compared to predictions of Heavy Baryon Chiral Perturbation Theory

Topics: QC
Publisher: Elsevier BV
Year: 2001
OAI identifier: oai:eprints.gla.ac.uk:1516
Provided by: Enlighten
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