Exotic colored scalars at the LHC

Kfir Blum; Aielet Efrati; Claudia Frugiuele; Yosef Nir

doi:10.1007/JHEP02(2017)104

paper

Exotic colored scalars at the LHC

arXiv:1610.06582 · doi:10.1007/JHEP02(2017)104

Abstract

We study the phenomenology of exotic color-triplet scalar particles $X$ with charge $∣ Q ∣ = 2/3, 4/3, 5/3, 7/3, 8/3$ and $10/3$ . If $X$ is a non-singlet of $S U (2)_{W}$ representation, mass splitting within the multiplet allows for cascade decays of the members into the lightest state. We study examples where the lightest state, in turn, decays into a three-body $W^{\pm} j j$ final state, and show that in such case the entire multiplet is compatible with existing direct collider searches and indirect precision tests down to $m_{X} \sim 250$ ~GeV. However, bound states $S$ , made of $X X^{†}$ pairs at $m_{S} \approx 2 m_{X}$ , form under rather generic conditions and their decay to diphoton can be the first discovery channel of the model. Furthermore, for $S U (2)_{W}$ -non-singlets, the mode $S \to W^{+} W^{-}$ may be observable and the width of $S \to γ γ$ and $S \to j j$ may appear large as a consequence of mass splittings within the $X$ -multiplet. As an example we study in detail the case of an $S U (2)_{W}$ quartet, finding that $m_{X} ≃ 450$ ~GeV is allowed by all current searches.

20 pages, 3 figures

Exotic colored scalars at the LHC

Abstract

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