Extended Data Fig. 7: Constraint on right-handed beyond-standard-model currents.

Measurements of cold neutron decays (\(n\to p{e}^{-}\bar{\nu }\); n, neutron; p, proton; e^−, electron; \(\bar{\nu }\), antineutrino) provide some of the most stringent constraints on new physics. A recent comparison of constraints from low-energy experiments and colliders found comparable constraints on right-handed beyond-standard-model currents²⁹. The figure has been adapted from figure 12 of ref. ²⁹ using our determination of g_A. The vertical orange band is the constraint on the right-handed coupling (ξ _ud ) from our result. The blue circle arises from collider constraints on W- and Higgs-boson production (WH) at collision energy \(\sqrt{S}=14\,{\rm{TeV}}\), and the diagonal red band is from pion decays (long direction; π → μ\(\bar{\nu }\), where μ is a muon) and super-allowed 0⁺ → 0⁺ nuclear decays, which constrain corrections to the axial (left (δV _ud ) minus right) and vector (left plus right) currents, respectively.