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Explaining 750 GeV diphoton excess from top/bottom partner cascade decay in two-Higgs-doublet model extension
Xiao-fang HanLei WangLei WangJin Min YangJin Min YangMengchao ZhangLei Wusubject
Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsLarge Hadron Collider010308 nuclear & particles physicsPhysics beyond the Standard ModelHigh Energy Physics::PhenomenologyFOS: Physical sciences750 GeV diphoton excessParameter space01 natural sciencesResonance (particle physics)lcsh:QC1-999Nuclear physicsHigh Energy Physics - PhenomenologyTwo-Higgs-doublet modelHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesHiggs bosonHigh Energy Physics::Experiment010306 general physicslcsh:Physicsdescription
In this paper, we interpret the 750 GeV diphoton excess in the Zee-Babu extension of the two-Higgs-doublet model by introducing a top partner ($T$)/bottom partner ($B$). In the alignment limit, the 750 GeV resonance is identified as the heavy CP-even Higgs boson ($H$), which can be sizably produced via the QCD process $pp \to T\bar{T}$ or $pp \to B\bar{B}$ followed by the decay $T\to Ht$ or $B \to Hb$. The diphoton decay rate of $H$ is greatly enhanced by the charged singlet scalars predicted in the Zee-Babu extension and the total width of $H$ can be as large as 7 GeV. Under the current LHC constraints, we scan the parameter space and find that such an extension can account for the observed diphoton excess.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-05-01 | Physics Letters B |