Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Fundamentale Symmetrien I

HK 27.4: Talk

Tuesday, March 16, 2010, 17:45–18:00, HG V

First results of Beta-asymmetry measurement in neutron decay with the spectrometer Perkeo III — •Holger Mest¹, Bastian Märkisch^1,2, Torsten Soldner^2,3, Xiangzun Wang⁴, Dominik Werder¹, Alexander Petukhov², Hartmut Abele⁴, and Dirk Dubbers¹ — ¹Physikalisches Institut, Universität Heidelberg — ²Institut Laue-Langevin, Grenoble — ³Physik-Department E18, TU München — ⁴Atominstitut, TU Wien

Neutron decay is well described by theory. Accurate measurements of correlations in this semileptonic decay allow high precision tests of the Standard Model and physics beyond, i.e. unitarity of quark mixing CKM matrix, right handed currents or scalar and tensor interactions. With the new spectrometer Perkeo III we measured the parity-violating Beta-asymmetry described by the correlation-coefficient A. We improved systematics as well as statistics. The measurement is virtually background-free due to the use of a pulsed cold neutron beam. The instrument was installed at the high flux neutron source at the ILL. Data taking has been finished in August 2009. We present the current status of the data analysis.