Author/Authors :
Wietfeldt، نويسنده , , F.E. and Fisher، نويسنده , , B.M. and Trull، نويسنده , , C. and Jones، نويسنده , , G.L. and Collet، نويسنده , , B. R. Goldin، نويسنده , , L. and Yerozolimsky، نويسنده , , B.G. and Wilson، نويسنده , , R. and Balashov، نويسنده , , S. and Mostovoy، نويسنده , , Yu. and Komives، نويسنده , , Marieke A. and Leuschner، نويسنده , , M. and Byrne، نويسنده , , J. and Bateman، نويسنده , , F.B. and Dewey، نويسنده , , M.S. and Nic، نويسنده ,
Abstract :
The angular correlation between the beta electron and antineutrino in nuclear beta decay is characterized by the dimensionless parameter a . The value of a for free neutron decay, when combined with other neutron decay parameters, can be used to determine the weak vector and axial vector coupling constants g V and g A and test the validity and self-consistency of the Electroweak Standard Model. Previous experiments that measured a in neutron decay relied on precise proton spectroscopy and were limited by systematic effects at about the 5% level. We present a new approach to measuring a for which systematic uncertainties promise to be much smaller.
