Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-08
Phys.Rev.Lett.86:5666-5669,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, REVTeX, intro. broadened, typos fixed, to appear in PRL
Scientific paper
10.1103/PhysRevLett.86.5666
The correlation coefficients a, A, and B in neutron beta-decay are proportional to the ratio of the axial-vector to vector weak coupling constants, g_A/g_V, to leading recoil order. With the advent of the next generation of neutron decay experiments, the recoil-order corrections to these expressions become experimentally accessible, admitting a plurality of Standard Model (SM) tests. The measurement of both a and A, e.g., allows one to test the conserved-vector-current (CVC) hypothesis and to search for second-class currents (SCC) independently. The anticipated precision of these measurements suggests that the bounds on CVC violation and SCC from studies of nuclear beta-decay can be qualitatively bettered. Departures from SM expectations can be interpreted as evidence for non-V-A currents.
Gardner Susan
Zhang Caicheng
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