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 + E-T, with E-T 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 h(1) and pseudoscalar a(1), and singlinolike neutralino chi(1), all with masses of less than or similar to 10 GeV, and the generic suppression of the exotic decays of the 125 GeV Higgs boson h(2) -> h(1)h(1), a(1)a(1) and chi(1)chi(1), however. As an illustration, we study the decay topology: h(2) -> chi(1)chi(2), where the binolike chi(2) decays to h(1)chi(1) or a(1)chi(1), and h(1)/a(1) -> f (f) over bar, with f (f) over bar = mu(+)mu(-), b (b) over bar. In the dimuon case (m(h1/a1) similar to 1 GeV), a statistical sensitivity of S/root B > 6 sigma can be achieved easily at the 8 TeV LHC, assuming sigma(pp -> Wh(2))/sigma(pp -> Wh(SM))Br(h(2) -> mu(+)mu(-) chi(1)chi(1)) = 0.1. In the b (b) over bar case (m(h1/a1) similar to 45 GeV), 600 fb(-1) data at the 14 TeV LHC can lead to a statistical sensitivity of S/root B > 5 sigma, assuming sigma(pp -> Zh(2))/sigma(pp -> Zh(SM))Br(h(2) -> b (b) over bar chi(1)chi(1)) = 0.5. These exotic decays open a new avenue for exploring new physics couplings with the 125 GeV Higgs boson at colliders.