Collider Cross Talk

Optimizing Higgs boson CP measurement in $H \to \tau \tau$ decay with ML techniques

by Brian Le, Zbigniew Andrzej Was (Polish Academy of Sciences (PL))

Europe/Zurich
4/2-011 - TH common room (CERN)

4/2-011 - TH common room

CERN

15
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Description
With discovery of the (presumably Standard Model) Higgs boson, it is necessary to confirm that all its couplings and properties are indeed as they should be, for the Higgs boson of the Standard Model. We will concentrate on the measurement of Higgs coupling to the tau leptons, to confirm if it is of a scalar, pseudoscalar or mixed parity nature. Tau decays to 2 pions and 3 pions will be used, but not utilising the the tau decay vertex which is an independent possibility. Due to the multi-dimensional nature of the decay, evaluation of a sensitive observable requires a multivariate approach such as Neural Networks. In the study we need to combine (i) properties of tau decay and Higgs production and decay (ii) geometrical properties of the combined tau production and decay distributions (iii) appropriate computing methods (iv) properties of detector response and background. Studies of (i) to (iii) were found to be promising. We turn our attention now to detector conditions which may heavily impact the sensitivity of input features and thus the final observable.