A Simple $U(1)$ Gauge Theory Explanation of the Diphoton Excess

Spencer Chang

doi:10.1103/PhysRevD.93.055016

paper

A Simple $U (1)$ Gauge Theory Explanation of the Diphoton Excess

arXiv:1512.06426 · doi:10.1103/PhysRevD.93.055016

Abstract

The recent ATLAS and CMS diphoton resonance excesses are explored in a simple $U (1)$ gauge theory extension of the Standard Model where the resonance is the Higgs boson of the $U (1)$ symmetry breaking, $ϕ$ . This particle couples to exotic quarks which, through loops, can produce a large enough rate to explain the excess. Due to the choice of $U (1)$ charges, flavor constraints are naturally suppressed, allowing arbitrary flavor violation in the decays of the new quarks to up-type quarks, modifying their signal topologies. An additional heavy quark in the model decays to the lighter exotic quark by emitting either $ϕ$ or the $U (1)$ gauge boson, $A_{x}$ , giving extra signals containing diphoton and digluon resonances. Finally, the new Higgs can decay into $γ A_{x}$ and $Z A_{x}$ , followed by $A_{x}$ decaying into Standard Model fermions through kinetic mixing. Thus, this model gives interesting modified signals to the general class of exotic quark models explaining the diphoton resonance.

5 pages, 2 figures, revtex; added references, discussion and predictions for phi decays into heavy A_x gauge boson

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A Simple $U (1)$ Gauge Theory Explanation of the Diphoton Excess