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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.

BRAND – Search for BSM physics at TeV scale by exploring transverse polarization of electrons emitted in neutron decay