Tests of the standard electroweak model in nuclear beta decay
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 modelindependent 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 C_{A}/C_{V}=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 lowenergy beams are also addressed.
 Publication:

Reviews of Modern Physics
 Pub Date:
 July 2006
 DOI:
 10.1103/RevModPhys.78.991
 arXiv:
 arXiv:nuclex/0605029
 Bibcode:
 2006RvMP...78..991S
 Keywords:

 12.15.y;
 23.40.s;
 24.80.+y;
 11.30.Er;
 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;
 Nuclear Experiment
 EPrint:
 52 pages, 33 figures