Same-sign dilepton excesses and vector-like quarks

Chuan Ren Chen*, Hsin Chia Cheng, Ian Low

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Abstract: Multiple analyses from ATLAS and CMS collaborations, including searches for ttH production, supersymmetric particles and vector-like quarks, observed excesses in the same-sign dilepton channel containing b-jets and missing transverse energy in the LHC Run 1 data. In the context of little Higgs theories with T parity, we explain these excesses using vector-like T-odd quarks decaying into a top quark, a W boson and the lightest T-odd particle (LTP). For heavy vector-like quarks, decay topologies containing the LTP have not been searched for at the LHC. The bounds on the masses of the T-odd quarks can be estimated in a simplified model approach by adapting the search limits for top/bottom squarks in supersymmetry. Assuming a realistic decay branching fraction, a benchmark with a 750 GeV T-odd b′ quark is proposed. We also comment on the possibility to fit excesses in different analyses in a common framework.

Original languageEnglish
Article number98
JournalJournal of High Energy Physics
Issue number3
Publication statusPublished - 2016 Mar 1


  • Hadronic Colliders
  • Phenomenological Models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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