Deep learning approach to the Higgs boson CP measurement in H to tau tau decay and associated systematics

The H→ττ decays form a promising channel for tests of the CP invariance of Higgs boson couplings. A previous study has shown the viability of deep learning techniques for such a measurement. In this paper, the study is extended to consider potential sources of uncertainty. Effects due to the limited experimental resolution are discussed. Furthermore, systematics due to τ decay modeling for complex cascade decays to τ±→a1±ντ→ρ0π±ντ→3π±ντ are also addressed. Various parametrizations using low-energy collision data are considered.