Boosted Higgs-pair production associated with large $E_T^{miss}$: a signal of $Z^\prime$

Abstract

Non-resonant production of Higgs-pair via heavy intermediate states may be a distinctive signature for extended discrete symmetries when accompaied by large missing transvers energy. We discuss T -parity as an example of such symmetry within the Littlest Higgs Model, where a new heavy gauge boson Z , the T -odd partner of SM Z-boson, predominately decays into to a Higgs boson and a dark matter candidate χ. In essence, T -parity stablises simultaneously both the Higgs mass and the dark matter. Production via pp → Z Z → 2h2χ may therefore yield important clues about symmetries connecting the Higgs and dark sectors. This paper makes a case for the search for this channel at the LHC by studying its discovery potential. It is demonstrated that in situations where a large Z − χ mass gap results in a boosted topology, the jet-substructure technique can be leveraged to reach the required significance for discovery in the 2h → 2γ2b decay mode.

Spotting hidden sectors with Higgs binoculars

“…A signal of two Higgs bosons and missing energy is naturally predicted in the context of supersymmetry (SUSY), for instance from Goldstino production in models with gauge mediated SUSY breaking [9,10], or from chain decays of superpartners into Higgs bosons and neutralinos in the minimal supersymmetric standard model (MSSM) and its extensions [11][12][13]. More generally, di-Higgs plus missing energy is a signature of models with extra scalars [14], such as a pseudo-scalar portal to a dark sector [15], axion-like particles [16], massive right-handed neutrinos [11,17] or in the framework of Little Higgs scenarios [11,18]. Experimental searches for di-Higgs plus / E T production at the LHC have been performed for a signal of four bottom quarks and missing energy in the context of SUSY [19,20].…”

Multi-Higgs Boson Probes of the Dark Sector

“…Higgs portal dark matter can manifest itself in di-Higgs or multi-Higgs final states with large missing energy, which appears due to emission of undetected dark matter. Analogous signals arise in a multitude of New Physics models as studied in [5][6][7][8][9][10][11][12][13][14][15][16]. LHC searches for di-Higgs + E T have been presented in [17][18][19].…”