Abstract
Suppose a heavy neutral Higgs or scalar boson H is discovered at the LHC, it is important to investigate its couplings to the standard model particles as much as possible. Here in this work we attempt to probe the CP-even and CP-odd couplings of the heavy Higgs boson to a pair of top quarks, through the decay \( H\to t\overline{t}\to b{W}^{+}\overline{b}{W}^{-} \). We use the helicity-amplitude method to write down the most general form for the angular distributions of the final-state b quarks and W bosons. We figure out that there are 6 types of angular observables and, under \( \mathrm{C}\mathrm{P}\tilde{\mathrm{T}} \) conservation, one-dimensional angular distributions can only reveal two of them. Nevertheless, the H couplings to the \( t\overline{t} \) pair can be fully determined by exploiting the one-dimensional angular distributions. A Higgs-boson mass of 380 GeV not too far above the \( t\overline{t} \) threshold is illustrated with full details. With a total of 104 events of \( H\to t\overline{t}\to b{W}^{+}\overline{b}{W}^{+} \), one can determine the couplings up to 10-20% uncertainties.
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Chang, J., Cheung, K., Lee, J.S. et al. Measuring properties of a Heavy Higgs boson in the \( H\to t\overline{t}\to b{W}^{+}\overline{b}{W}^{-} \) decay. J. High Energ. Phys. 2018, 162 (2018). https://doi.org/10.1007/JHEP05(2018)162
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DOI: https://doi.org/10.1007/JHEP05(2018)162