Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy 10

HK 47.7: Vortrag

Mittwoch, 25. März 2015, 16:00–16:15, T/SR25

Determination of the strange vector form factors and the anapole moment of the nucleon from measurements of the A4 Collaboration — •David Balaguer Ríos, Kurt Aulenbacher, Sebastian Baunack, Dominik Becker, Luigi Capozza, Jürgen Diefenbach, Boris Gläser, Dietrich von Harrach, Yoshio Imai, Eva-Maria Kabuss, Rainer Kothe, Jeonghan Lee, Frank Maas, Harald Merkel, María Carmen Mora Espí, Ernst Schilling, and Christoph Weinrich for the A4 collaboration — Institut für Kernphysik, Mainz, Germany

At the MAMI accelerator facility the A4 collaboration has measured the parity violating asymmetry in the quasielastic scattering of longitudinally polarized electrons on the deuteron at backward angles at Q² = 0.23 (GeV)². The aim is to extract simultaneously the strange vector form factors G_E^s, G_M^s and the dominant isovector axial vector form factor of the nucleon G_A^e,(T=1). Moreover this set of measurements permits the constrain of electroweak radiative corrections contributing to the effective axial vector current of the nucleon as seen by the photon (the nucleon anapole moment). In this talk the latest measurement of the asymmetry is presented and discussed in terms of strangeness and axial form factors of the nucleon.