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.Comment: 22 pages, 10 figures. v2: Minor changes; matches published versio