Exploiting the WH/ZH symmetry in the search for new physics

We suggest to isolate the loop-induced gluon-initiated component (gg -> ZH) for associated ZH production by using the similarity of the Drell-Yan-like component for ZH production to the WH process. We argue that the cross-section ratio of the latter two processes can be predicted with high theoretical accuracy. Comparing it to the experimental ZH / WH cross-section ratio should allow to probe for new physics in the gg -> ZH component at the HL-LHC. We consider typical BSM scenarios in order to exemplify the effect they would have on the proposed observable.