Determining the CP parity of Higgs bosons at the LHC in the $τ$ to 1-prong decay channels

Stefan Berge; Werner Bernreuther

doi:10.1016/j.physletb.2008.12.065

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arXiv · 0812.1910

Determining the CP parity of Higgs bosons at the LHC in the $τ$ to 1-prong decay channels

Stefan Berge·Werner Bernreuther

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Abstract

We propose a method for determining the CP nature of a neutral Higgs boson or spin-zero resonance $ϕ$ at the CERN Large Hadron Collider (LHC) in its $ϕ\toτ^{-}τ^{+}$ decay channel. The method can be applied to any 1-prong $τ$-decay mode, which comprise the majority of the $τ$-lepton decays. The proposed observables allow to discriminate between pure scalar and pseudoscalar Higgs-boson states and/or between a CP-conserving and CP-violating Higgs sector. We show for the decays $τ\toπν_τ$ that the method maintains its discriminating power when measurement uncertainties are taken into account. The method will be applicable also at a future linear $e^{+}e^{-}$ collider.

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Stefan Berge, Werner Bernreuther. 2008-12-10. Determining the CP parity of Higgs bosons at the LHC in the $τ$ to 1-prong decay channels. https://doi.org/10.1016/j.physletb.2008.12.065

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