Abstract
We study the prospects of measuring the CP property of the Higgs (h) coupling to tau leptons using the vector boson fusion (VBF) production mode at the high-luminosity LHC. Utilizing the previously proposed angle between the planes spanned by the momentum vectors of the (π + π 0) and (π − π 0) pairs originating in τ ± decays as the CP-odd observable, we perform a detailed Monte Carlo analysis, taking into account the relevant standard model backgrounds, as well as detector resolution effects. We find that excluding a pure C \( \mathcal{O}\left(400\ {\mathrm{fb}}^{-1}\right) \) luminosity at the 14 TeV LHC, and values of the CP-mixing angle larger than about 25° can be excluded at 95% confidence level using 3 ab−1 data. It is observed that the uncertainty in the angular resolution of the neutral pion momenta does not constitute a significant hurdle. Achieving a signal to background ratio (S/B) close to one, while keeping a high enough signal yield required to study the angular distributions selects out VBF as a promising mode to probe the CP nature of the hτ τ coupling, with gluon fusion suffering from a low S/B, and the W ± h/Zh mode (with leptonically decaying W ± /Z) having a much smaller signal rate.
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Han, T., Mukhopadhyay, S., Mukhopadhyaya, B. et al. Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC. J. High Energ. Phys. 2017, 128 (2017). https://doi.org/10.1007/JHEP05(2017)128
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DOI: https://doi.org/10.1007/JHEP05(2017)128