Supersymmetric Exotic Decays of the 125 GeV Higgs Boson.

We reveal a set of novel decay topologies for the 125 GeV Higgs boson in supersymmetry which are initiated by its decay into a pair of neutralinos, and discuss their collider search strategies. This category of exotic Higgs decays is characterized by the collider signature: visible objects +ET, with ET dominantly arising from escaping dark matter particles. Their benchmark arises naturally in the Peccei-Quinn symmetry limit of the minimal supersymmetric standard model singlet extensions, which is typified by the coexistence of three light particles: singletlike scalar h1 and pseudoscalar a1, and singlinolike neutralino χ1, all with masses of ≲10 GeV, and the generic suppression of the exotic decays of the 125 GeV Higgs boson h2→h1h1, a1a1 and χ1χ1, however. As an illustration, we study the decay topology: h2→χ1χ2, where the binolike χ2 decays to h1χ1 or a1χ1, and h1/a1→ff, with f̄f=μ+μ-, b̄b. In the dimuon case (mh1/a1~1 GeV), a statistical sensitivity of S/√B>6σ can be achieved easily at the 8 TeV LHC, assuming σ(pp→Wh2)/σ(pp→WhSM)Br(h2→μ+μ-χ1χ1)=0.1. In the b√b case (mh1/a1~45  GeV), 600 fb-1 data at the 14 TeV LHC can lead to a statistical sensitivity of S/√B>5σ, assuming σ(pp→Zh2)/σ(pp→ZhSM)Br(h2→b̄bχ1χ1)=0.5. These exotic decays open a new avenue for exploring new physics couplings with the 125 GeV Higgs boson at colliders. [ABSTRACT FROM AUTHOR]