Constraints on Mediator Coupled to Heavy Quarks from LHC Data

Manuel Drees; Zhongyi Zhang

doi:10.1016/j.physletb.2019.134832

paper

Constraints on Mediator Coupled to Heavy Quarks from LHC Data

arXiv:1903.00496 · doi:10.1016/j.physletb.2019.134832

Abstract

We apply LHC data to constrain a simplified extension of the Standard Model containing a new spin-1 mediator $R$ , which does not couple to first generation quarks, and a spinor dark matter particle $χ$ . We recast ATLAS and CMS searches for final states containing one or more jet(s) + missing $E_{T}$ , with or without $b$ tags, as well as searches for di-jet resonances with $b$ or $t$ tagging. We find that LHC constraints on the axial vector couplings of the mediator are always stronger than the unitarity bound, which scales like $m_{R} / m_{t}$ . If $R$ has a sizable invisible branching ratio, the strongest LHC bound on both vector couplings and axial vector coupling comes from a di-jet + missing $E_{T}$ search with or without double $b$ tag. These bounds are quite strong for $m_{R} < 1$ TeV, even though we have switched off all couplings to valence quarks. Searches for a di-jet resonance with double $b$ tag lead to comparable bounds with the previous results even if $R \to χ χ ˉ$ decays are allowed; these are the only sensitive LHC searches if the invisible branching ratio of $R$ is very small or zero.

arXiv comment13 pages, 2 figures

Constraints on Mediator Coupled to Heavy Quarks from LHC Data

Abstract

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