Coherent π^0 threshold production from the deuteron at Q^2 = 0.1 GeV^2/c^2

Ingo Ewald; Peter Bartsch; Dagmar Baumann; Jörg Bermuth; Aron M. Bernstein; Klemen Bohinc; Ralph Böhm; Norbert Clawiter; Sabine Derber; Matthias Ding; Michael O. Distler; Jan M. Friedrich; Jörg Friedrich; Marco Kahrau; Michael Kohl; Alexander Kozlov; K. W. Krygier; Arnd Liesenfeld; Harald Merkel; Pascal Merle; Ulrich Müller; Reiner Neuhausen; Marcello Pavan; Thomas Pospischil; M. Potokar; Daniela Rohe; Günther Rosner; Hartmut Schmieden; Simon Širca; Axel Wagner; Thomas Walcher; Markus Weis

doi:10.1016/s0370-2693(00)01396-4

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Coherent π^0 threshold production from the deuteron at Q^2 = 0.1 GeV^2/c^2

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Abstract

First data on coherent threshold π^0 electroproduction from the deuteron taken by the A1 Collaboration at the Mainz Microtron MAMI are presented. At a four-momentum transfer of q^2=-0.1 GeV^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.

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Ingo Ewald, Peter Bartsch, Dagmar Baumann, Jörg Bermuth, Aron M. Bernstein, Klemen Bohinc, Ralph Böhm, Norbert Clawiter, Sabine Derber, Matthias Ding, Michael O. Distler, Jan M. Friedrich, Jörg Friedrich, Marco Kahrau, Michael Kohl, Alexander Kozlov, K. W. Krygier, Arnd Liesenfeld, Harald Merkel, Pascal Merle, Ulrich Müller, Reiner Neuhausen, Marcello Pavan, Thomas Pospischil, M. Potokar, Daniela Rohe, Günther Rosner, Hartmut Schmieden, Simon Širca, Axel Wagner, Thomas Walcher, Markus Weis. 2001-02-02. Coherent π^0 threshold production from the deuteron at Q^2 = 0.1 GeV^2/c^2. https://doi.org/10.1016/s0370-2693(00)01396-4

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