Abstract
Neutron and nuclear beta decay correlation coefficients are linearly sensitive to the exotic scalar and tensor interactions that are not included in the Standard Model (SM). The proposed experiment will measure simultaneously 11 neutron correlation coefficients (a, a, B, D, H, L, N, R, S, U, V) where 7 of them (H, L, N, R, S, U, V) depend on the transverse electron polarization – a quantity that vanishes for the SM weak interaction. The neutron decay correlation coefficients H, L, S, U, V were never attempted experimentally before. The expected ultimate sensitivity of the proposed experiment that currently takes off on the cold neutron beamline PF1B at the Institut Laue-Langevin, Grenoble, France, is comparable to that of the planned electron spectrum shape measurements in neutron and nuclear β decays but offers completely different systematics and additional sensitivity to imaginary parts of the scalar and tensor couplings.
Highlights
Nuclear and neutron beta decay have played a crucial role in the development of the weak interaction theory
BRAND is a complicated and challenging experimental proposal in the field of particle physics at the precision frontier. It will provide exclusive empirical data for searches of feeble traces of forces potentially contributing to week interactions at the energy scale of several TeV
The added value of the expected BRAND results is generated by similar statistical sensitivity and completely different systematics as compared to the “classical” neutron and nuclear beta decay experiments
Summary
Nuclear and neutron beta decay have played a crucial role in the development of the weak interaction theory. The main aim of low-energy experiments such as beta decay is to find deviations from the SM assumptions as possible indications of new physics. Intensive searches for new physics beyond the Standard Model (BSM) concentrate on two main frontiers: (i) high energy experiments performed at collider accelerators and (ii) low energy precision experiments. Seven of these correlation coefficients are related to the transverse polarization component of the electrons emitted in the decay. Control of systematic effects is the key issue for precision experiments
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