Dark sector shining through 750 GeV dark Higgs boson at the LHC

P. Ko; Takaaki Nomura

doi:10.1016/j.physletb.2016.05.014

paper

Dark sector shining through 750 GeV dark Higgs boson at the LHC

arXiv:1601.02490 · doi:10.1016/j.physletb.2016.05.014

Abstract

We consider a dark sector with $S U (3)_{C} \times U (1)_{Y} \times U (1)_{X}$ and three families of dark fermions that are chiral under dark $U (1)_{X}$ gauge symmetry, whereas scalar dark matter $X$ is the SM singlet. $U (1)_{X}$ dark symmetry is spontaneously broken by nonzero VEV of dark Higgs field $⟨ Φ ⟩$ , generating the masses of dark fermions and dark photon $Z^{'}$ . The resulting dark Higgs boson $ϕ$ can be produced at the LHC by dark quark loop (involving 3 generation) and will decay into a pair of photon through charged dark fermion loop. Its decay width can be easily $\sim 45$ GeV due to its possible decays into a pair of dark photon, which is not strongly constrained by the current LHC searches $pp \to ϕ \to Z^{'} Z^{'}$ followed by $Z^{'}$ decays into the SM fermion pairs. The scalar DM can achieve thermal relic density without conflict with direct detection bound or the invisible $ϕ$ decay into a pair of DM.

8 pages, 6 figures,discussions are extended, version published in PLB

Dark sector shining through 750 GeV dark Higgs boson at the LHC

Abstract

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