Axion-mediated forces, CP violation and left-right interactions

Abstract

We compute the CP-violating (CPV) scalar axion coupling to nucleons in the framework of baryon chiral perturbation theory and we apply the results to the case of left-right symmetry. The correlated constraints with other CPV observables show that the predicted axion nucleon coupling is within the reach of present axion-mediated force experiments for $M_{W_R}$ up to $1000$ TeV.

Comments: 7 pages, 1 figure. Version to appear in Physical Review Letters