Constraints on exotic interactions from scalar spin-spin coupling in tritium deuteride (DT)

A comparison of theoretical and experimental values of the scalar spin-spin interaction ($J$-coupling) in tritium deuteride molecules yield constraints for nucleon-nucleon exotic interactions of the dimensionless coupling strengths $g_V{g}_V$, $g_A{g}_A$ and $g_p{g}_p$, corresponding to the exchange of an vector, axial-vector, and pseudoscalar (axionlike) boson. The couplings between proton ($p$) and nucleon ($N$), denoted by $g_V^p{g}_V^N$, $g_p^p{g}_p^N$ are constrained to be less than $1.4\times {10}^{-6}$ and $2.7\times {10}^{-6}$, respectively, for boson masses around 5 keV. The coupling constant $g_A^p{g}_A^N$ is constrained to be less than $1.0\times {10}^{-18}$ for boson masses $\le 100$ eV. It is noteworthy that this study represents the first instance in which constraints on $g_V{g}_V$ have been established through the analysis of the potential term $V_2+V_3$ for both tritium deuteride and hydrogen deuteride molecules.