Diphoton Excess at 750 GeV in leptophobic U(1)$^\prime$ model inspired by $E_6$ GUT

P. Ko; Yuji Omura; Chaehyun Yu

doi:10.1007/JHEP04(2016)098

paper

Diphoton Excess at 750 GeV in leptophobic U(1) $^{'}$ model inspired by $E_{6}$ GUT

arXiv:1601.00586 · doi:10.1007/JHEP04(2016)098

Abstract

We discuss the 750 GeV diphoton excess at the LHC@13TeV in the framework of leptophobic U(1) $^{'}$ model inspired by $E_{6}$ grand unified theory (GUT). In this model, the Standard Model (SM) chiral fermions carry charges under extra U(1) $^{'}$ gauge symmetry which is spontaneously broken by a U(1) $^{'}$ -charged singlet scalar ( $Φ$ ). In addition, extra quarks and leptons are introduced to achieve the anomaly-free conditions, which is a natural consequence of the assumed $E_{6}$ GUT. These new fermions are vectorlike under the SM gauge group but chiral under new U(1) $^{'}$ , and their masses come entirely from the nonzero vacuum expectation value of $Φ$ through the Yukawa interactions. Then, the CP-even scalar $h_{Φ}$ from $Φ$ can be produced at the LHC by the gluon fusion and decay to the diphoton via the one-loop diagram involving the extra quarks and leptons, and can be identified as the origin of diphoton excess at 750 GeV. In this model, $h_{Φ}$ can decay into a pair of dark matter particles as well as a pair of scalar bosons, thereby a few tens of the decay width may be possible.

21 pages, 4 figures. Published version

Diphoton Excess at 750 GeV in leptophobic U(1) $^{'}$ model inspired by $E_{6}$ GUT

Abstract

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Diphoton Excess at 750 GeV in leptophobic U(1)′ model inspired by E6​ GUT

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Cited by in corpus (38)

Diphoton Excess at 750 GeV in leptophobic U(1) $^{'}$ model inspired by $E_{6}$ GUT