Discovering Higgs boson pair production through rare final states at a 100 TeV collider

We consider the process of Higgs boson pair production at a future proton collider with a center-of-mass energy of 100 TeV, focusing on rare final states that include a bottom-antibottom quark pair and multiple isolated leptons: $hh\to (b\overline{b})+n\ell +X$, $n=\{2,4\}$, $X=\{{\cancel{E}}_T,\gamma ,-\}$. We construct experimental search strategies for observing the process through these channels and make suggestions on the desired requirements for the detector design of the future collider.

Figure 1

The final reconstructed observables for the $(b\overline{b})(4\ell )$ final state, for the LHC parametrization: the invariant mass of the four leptons, the invariant mass of the $b$-jet pair and the invariant mass of all six reconstructed objects. In the former two, the signal has been multiplied by a factor of 10 for clarity. The invariant mass of all objects is given after cuts on the prior two observables have been imposed. The Monte Carlo statistical errors are shown for each data sample to help distinguish statistical fluctuations from physical features.

Figure 2

The transverse momenta of the four leptons in the $(b\overline{b})(4\ell )$ final state prior to any cuts are shown on the left, for the $hh$ signal. The leptons are ordered in $p_T$ with $p_{T,\ell i}>p_{T,\ell j}$ for $j>i$. The right-hand figure shows the ordered transverse momenta of the $b$ jets for completeness.