Measurement of the transverse polarization of electrons emitted in neutron decay – nTRV experiment

This paper recalls the main achievements of nTRV experiment which measured two components transverse polarization ( \sigma_{T_{1}} σT1 , \sigma_{T_{2}} display="inline">σT2 ) electrons emitted in \beta display="inline">β -decay polarized, free neutrons and deduced correlation coefficients, R display="inline">R N display="inline">N that are sensitive to physics beyond Standard Model. The value time-reversal odd coefficient 0.004 \pm display="inline">± 0.012 0.005, significantly improved limits on relative strength imaginary scalar coupling constant weak interaction. obtained for even 0.067 0.011 0.004, agrees with Model expectation, providing an important sensitivity test electron polarimeter. One conclusions this pioneering was neutron is worth more systematic exploring by measurements yet experimentally not attempted coefficients such as H display="inline">H L display="inline">L S display="inline">S U display="inline">U V display="inline">V . article presents a brief outlook questions.