Enhanced $thj$ signal at the LHC with $h\rightarrow γγ$ decay and $\mathcal{CP}$-violating top-Higgs coupling

Jason Yue

doi:10.1016/j.physletb.2015.03.044

paper

Enhanced $t hj$ signal at the LHC with $h \to γ γ$ decay and $C P$ -violating top-Higgs coupling

arXiv:1410.2701 · doi:10.1016/j.physletb.2015.03.044

Abstract

We study the observability of non-standard top Yukawa couplings in the $pp \to t (\to ℓ ν_{ℓ} b) h (\to γ γ) j$ channel at 14 TeV high-luminosity LHC (HL-LHC). The small diphoton branching ratio is enhanced when the $C P$ -violating phase, $ξ$ , of the top-Higgs interaction is non-zero. When the modulus of the top-Higgs interaction assumes the SM value, $y_{t} = y_{t}^{S M}$ , we find that the signal significance reaches $2.7 σ$ $(7.7 σ)$ when $ξ = 0.25 π$ $(0.5 π)$ . Furthermore, the different couplings modify the polarisation of the top quark, and can subsequently be distinguished via asymmetries in spin correlations with the final state leptons. The diphoton decay mode is found to be significantly more promising than the previously considered $pp \to t (\to ℓ ν_{ℓ} b) h (\to b b) j$ channel.

arXiv comment14 pages, 3 figures and 2 tables; minor corrections to match published version

Enhanced $t hj$ signal at the LHC with $h \to γ γ$ decay and $C P$ -violating top-Higgs coupling

Abstract

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Enhanced thj signal at the LHC with h→γγ decay and CP-violating top-Higgs coupling

Abstract

References in corpus (90)

Cited by in corpus (28)

Enhanced $t hj$ signal at the LHC with $h \to γ γ$ decay and $C P$ -violating top-Higgs coupling