By studying the threshold dependence of the excitation curve and the angular distribution in Higgs-strahlung at e+e- colliders, e+e- -> HZ, the spin of the Higgs boson in the Standard Model and related extensions can be determined unambiguously in a model-independent way.
@article{arxiv.hep-ph/0102023,
title = {Measuring the Spin of the Higgs Boson},
author = {D. J. Miller and S. Y. Choi and B. Eberle and M. M. Muhlleitner and P. M. Zerwas},
journal= {arXiv preprint arXiv:hep-ph/0102023},
year = {2016}
}