Speaker
Description
We study the measurement of Higgs boson self-couplings in $2\rightarrow 3$ vector boson scattering processes in proton colliders and lepton colliders in the framework of Standard Model Effective Field Theory, taking the examples of $W^{\pm}_L W^{\pm}_L\rightarrow W^{\pm}_L W^{\pm}_L h$ and $W^+_L W^-_L\rightarrow h h h$. First, by taking Goldstone equivalence theorem and analysing the amplitudes in high energy, we find that
the ratio of beyond-standard-model amplitudes to standard model ones approaches to $\frac{{\mathcal A}^{\text{BSM}}}{{\mathcal A}^{\text{SM}}} \sim \frac{E^2}{\Lambda^2}$. The dependence of amplitudes on the Wilson coefficient $c_6$ is mainly through a 5-point contact scalar vertex. Second, using MadGraph5_aMC@NLO for simulating full processes without decaying the heavy bosons, we find the full cross sections remain very sensitive to relevant Wilson coefficients. Sensitivity of full cross sections of $W^{\pm}_L W^{\pm}_L\rightarrow W^{\pm}_L W^{\pm}_L h$ on $c_6$ requires $p_T$ cuts on the final states to reduce the enhanced SM cross sections due to Sudakov logarithms. $\sigma/\sigma_{\text{SM}}$ in lepton colliders at $\sqrt{s}\ge3$ TeV and proton colliders at $\sqrt{s}\ge 27$ TeV is comparable to, or even better than, di-Higgs channel at LHC
| Time Zone | Asia/Pacific |
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