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Scalar and tensor interactions were once competitors to the nowwell-established V-A structure of the Standard Model weak interactions. Werevisit these interactions and survey constraints from low-energy probes(neutron, nuclear, and pion decays) as well as collider searches. Currently,the most stringent limit on scalar and tensor interactions arise from 0+ -> 0+nuclear decays and the radiative pion decay pi -> e nu gamma, respectively. Forthe future, we find that upcoming neutron beta decay and LHC measurements willcompete in setting the most stringent bounds. For neutron beta decay, wedemonstrate the importance of lattice computations of the neutron-to-protonmatrix elements to setting limits on these interactions, and provide the firstlattice estimate of the scalar charge and a new average of existing results forthe tensor charge. Data taken at the LHC is currently probing theseinteractions at the 10^-2 level (relative to the standard weak interactions),with the potential to reach the 10^-3 level. We show that, with sometheoretical assumptions, the discovery of a charged spin-0 resonance decayingto an electron and missing energy implies a lower limit on the strength ofscalar interactions probed at low energy.

Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC