Quark EDMs can be sizably induced from BSM and are important sources for the neutron EDM. Especially strange quark EDM may be dominant over up and down quark EDMs if the quark EDMs are proportional to the quark masses. However, recent lattice simulations have shown that the strange quark contribution to the nucleon EDMs is actually negligible due to a small tensor charge. On the other hand, 2506.23402 by Luca Vecchi claimed that the strange quark contribution cannot be so small, barring accidental cancellations, based on several arguments.
In this talk, I will discuss his arguments based on naive dimensional analysis, chiral perturbation theory, constituent quark models, and large N_c. According to these arguments, the strange quark contribution may be dominant over the other light quarks, and the lattice results are puzzling.