Abstract
We consider Higgs boson pair production at a future proton collider with centre-of-mass energy of 100 TeV, focusing on rare final states that include a bottom-anti-bottom quark pair and multiple isolated leptons: $hh \rightarrow (b\bar{b}) + n \ell + X$, $n = \{2,4\}$, $X = \{ E_T^\mathrm{miss}, \gamma, -\}$. 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.
Highlights
In the “aftermath” of the Large Hadron Collider’s (LHC) “run 1” at 7 and 8 TeV, we are left with the grim possibility that striking new effects will be beyond the reach of the collider, perhaps even in “run 2” at 13 TeV
We generate the signal at leading order (LO) using the Herwig++ event generator [66,67,68,69] interfaced with the OpenLoops package for the one-loop amplitudes
The backgrounds have been generated with the MadGraph5/aMC@next-to-leading order (NLO) package [71,72,73], at NLO in QCD, except for the case of the tt background, which was generated at leading order and merged with the Herwig++ parton shower using the MLM algorithm, including tt þ 1 parton matrix elements
Summary
In the “aftermath” of the Large Hadron Collider’s (LHC) “run 1” at 7 and 8 TeV, we are left with the grim possibility that striking new effects will be beyond the reach of the collider, perhaps even in “run 2” at 13 TeV. Several studies examining the hh → ðbb ÞðγγÞ channel, with diverse assumptions on detector performance, indicate that it would provide a clear signal at the end of a 3 ab−1 run of the FCC-hh [46,51]. Of the multilepton channels examined here, all but the hh → ðbb ÞðWþW−Þ channel provide a negligible number of events at the LHC at 14 TeV These calculations, and the rest of the signal cross sections in this article, are based on the effective field theory-approximate total next-to-nextto-leading order cross section for Higgs boson pair production of σð TeVÞ 1⁄4 40.2 fb and σð100 TeVÞ 1⁄4 1638 fb [53].2. We conclude by summarizing and making general recommendations on desired features of the FCC-hh detectors
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