Abstract
Higgs pair production is a crucial phenomenological process in deciphering the nature of the TeV scale and the mechanism underlying electroweak symmetry breaking. At the Large Hadron Collider, this process is statistically limited. Pushing the energy frontier beyond the LHC’s reach will create new opportunities to exploit the rich phenomenology at higher centre-of-mass energies and luminosities. In this work, we perform a comparative analysis of the hh+text {jet} channel at a future 100 TeV hadron collider. We focus on the hhrightarrow bbar{b} bbar{b} and hh rightarrow bbar{b} tau ^+tau ^- channels and employ a range of analysis techniques to estimate the sensitivity potential that can be gained by including this jet-associated Higgs pair production to the list of sensitive collider processes in such an environment. In particular, we observe that hh rightarrow bbar{b} tau ^+tau ^- in the boosted regime exhibits a large sensitivity to the Higgs boson self-coupling and the Higgs self-coupling could be constrained at the 8% level in this channel alone.
Highlights
We focus on a training of the boosted decision tree for a SM-like value of the trilinear Higgs coupling λSM
For three different choices of the self-coupling within the κ framework [64], κλ = λ/λSM; boosted decision tree (BDT) training is performed with λ = λSM
ΛSM 2λSM 0.5λSM EW QCD+EW ttj choices of the self-coupling within the κ framework [64], κλ = λ/λSM; BDT training is performed with λ = λSM
Summary
Let us first turn to the jbbτ τ channels. We will see that these are more sensitive to variations of the trilinear Higgs coupling and they constitute the main result of this work. Scenarios involving two hadronic taus will incur stronger QCD backgrounds and we will need to simulate various fake backgrounds and will require an accurate knowledge of the j → τ j fake rate, where j denotes a light jet. At this stage, we do not feel confident that we can reliably estimate these fake backgrounds, and neglect this decay mode in the present study. The authors in Ref. [46] have considered several such definitions of the mT 2 variable and found them having very similar discriminatory power
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