Contribution to a conference proceedings/Internal Report

PUBDB-2015-05404

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Latest results from the $a$SPECT experiment

Wunderle, A. ; Zimmer, O. ; Virot, R. ; Theroine, C. ; Soldner, T. ; Simson, M. ; Schmidt, C. ; Maisonobe, R. ; Konrad, G. ; Heil, W. ; Glück, F. ; Beck, M. ; Baeßler, S.

2014
Deutsches Elektronen-Synchrotron, DESY Hamburg

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Please use a persistent id in citations: doi:10.3204/DESY-PROC-2014-04/72

Report No.: DESY-PROC-2014-04

Abstract: The $a$SPECT retardation spectrometer measures the $\beta - \bar{\nu}_e$ angular correlation coefficient \textit{a} in the $\beta$-decay of the free neutron.This measurement can be used to determine the ratio $\lambda = \frac{g_A}{g_V}$ of the weak coupling constants, as well as to search for physics beyond the standard electroweak model. In spring/summer 2013 \textit{a}SPECT had a successful beam time at the Institut Laue-Langevin (ILL), Grenoble/France. The goal of this beam time is to improve the current uncertainty of \textit{a} from $\frac{\Delta a}{a} \sim 5\%$ to about 1\%. To achieve this goal the systematic uncertainties of \textit{a}SPECT have to be understood accordingly. This is achieved via systematic tests, measurements of \textit{a} with different systematic parameter settings during the beam time and measurements afterwards, like the work-function fluctuations of electrodes or the magnetic field ratio of our spectrometer. Sophisticated simulations of our spectrometer are used to understand and reduce the systematic uncertainties further.

Keyword(s): electroweak interaction: model ; spectrometer ; angular correlation ; magnetic field ; weak coupling ; fluctuation ; electrode

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)
2. LHC/CMS Experiment (CMS)
3. Uni Hamburg / Experimentalphysik (UNI/EXP)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. No specific instrument

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Database coverage:

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Book/Proceedings/Internal Report Schmidt, A. (Editor)>Extern* ; Sander, C. (Editor)DESY*
Proceedings, 20th International Conference on Particles and Nuclei (PANIC 14)
2014Panic2014, Panic2014, HamburgHamburg, Germany, 25 Aug 2014 - 29 Aug 20142014-08-252014-08-29 Hamburg : Deutsches Elektronen-Synchrotron, DESY 1-754 (2014) [10.3204/DESY-PROC-2014-04]2014     Files  Fulltext BibTeX | EndNote: XML, Text | RIS

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