Measurement of the Neutrino Asymmetry Parameter B in Neutron Decay

Abstract

A new measurement of the neutrino asymmetry parameter B in neutron decay, the angular correlation between neutron spin and anti-neutrino momentum, is presented. The result, B=0.9802(50), agrees with the Standard Model expectation and earlier measurements, and permits improved tests on ``new physics'' in neutron decay.

4 pages, 2 figures; v2: revised PRL version