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In this paper, we discuss application of the TauSpinner package as asimulation tool for measuring the CP state of the newly discovered Higgs bosonusing the transverse spin correlations in the H to tau tau decay channel. Wediscuss application for its main background Z/gamma* to tau tau as well. TheTauSpinner package allows one to add, with the help of weights, transverse spincorrelations corresponding to any mixture of scalar/pseudoscalar state, onalready existing events using information from the kinematics of outgoing tauleptons and their decay products only. This procedure can be used whenpolarimetric vectors of the taus decays and density matrix for tau-pairproduction are not stored with the event sample.  We concentrate on the well-defined effects for the Higgs (or Higgs-likescalar) decays, which are physically separated from the production processes.TauSpinner also allows to reintroduce (or remove) spin correlations to eventsfrom Drell-Yan Z/gamma* to tau tau process, the main background for the Higgsparity observables, again with the help of weights only.  From the literature, we recall well-established observables, developed formeasuring the CP of the Higgs, and use them as benchmarks for illustratingapplications of the TauSpinner package. We also include a description of thecode and prepared testing examples.

TauSpinner: a tool for simulating CP effects in H to tau tau decays at LHC