Abstract
Inspired by the diphoton signal excess observed in the latest data of 13 TeV LHC, we consider either a 750 GeV real scalar or pseudo-scalar responsible for this anomaly. We propose a concrete vector-like quark model, in which the vector-like fermion pairs directly couple to this scalar via Yukawa interaction. For this setting the scalar is mainly produced via gluon fusion, then decays at the one-loop level to SM diboson channels gg,γγ,ZZ,WW. We show that for the vector-like fermion pairs with exotic electric charges, such model can account for the diphoton excess and is consistent with the data of 8 TeV LHC simultaneously in the context of perturbative analysis.
Highlights
The first data at the 13 TeV Large Hadron Collider (LHC) was released on December 15 2015 [1, 2]
Φ is mainly produced via gluon fusion, decays at the one-loop level to Standard Model (SM) diboson channels gg, ZZ, W W, with the colored vector-like fermion pair running in the Feynman loop
We consider the possibilities that either a SM singlet scalar or singlet pseudoscalar is responsible for the diphoton excess at 750 GeV in the 13 TeV LHC
Summary
The first data at the 13 TeV Large Hadron Collider (LHC) was released on December 15 2015 [1, 2] It shows an excess in diphoton final state at the invariant mass M ≃ 750 GeV, with local significance of order 3.9 σ and 2.6 σ for ATLAS and CMS, respectively. To explain the observed excess, the cross section σ(pp → φ → γγ) is required to satisfy the signal strength of order, σ(pp → φ → γγ) |√s=13 TeV≃ (8 ± 3) fb Such SM singlet scalar which is responsible for the excess has stimulated extensive interests, see Ref.[12]- Ref.[54]. For the vector-like fermion pairs with exotic electric charges, such model can account for the diphoton excess, and is consistent with the data of 8 TeV LHC simultaneously in the context of perturbative analysis.
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