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Title:
Tests of the standard electroweak model in nuclear beta decay
Authors:
Severijns, Nathal; Beck, Marcus; Naviliat-Cuncic, Oscar
Affiliation:
AA(Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium), AB(Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium), AC(Université de Caen Basse-Normandie and Laboratoire de Physique Corpusculaire CNRS-ENSI, F-14050 Caen, France)
Publication:
Reviews of Modern Physics, vol. 78, Issue 3, pp. 991-1040 (RvMP Homepage)
Publication Date:
07/2006
Origin:
APS
PACS Keywords:
Electroweak interactions, Beta decay, double beta decay, electron and muon capture, Nuclear tests of fundamental interactions and symmetries, Charge conjugation parity time reversal and other discrete symmetries
DOI:
10.1103/RevModPhys.78.991
Bibliographic Code:
2006RvMP...78..991S

Abstract

The current status of precision measurements in allowed nuclear beta decay is reviewed, including neutron decay, with emphasis on their potential to look for new physics beyond the standard electroweak model. Experimental results are interpreted in the framework of phenomenological model-independent descriptions of nuclear beta decay as well as in some specific extensions of the standard model. The values of the standard couplings and the constraints on the exotic couplings of the general beta decay Hamiltonian are updated. The ratio between the axial and vector couplings obtained is CA/CV=-1.26992(69) under standard model assumptions. Particular attention is devoted to the discussion of the sensitivity and complementarity of different precision experiments in direct beta decay. The prospects and impact of recent developments of precision tools and of high intensity low-energy beams are also addressed.
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