Same-Sign Dilepton Excesses and Vector-like Quarks
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-prime quark is proposed. We also comment on the possibility to fit excesses in different analyses in a common framework.
Cite
@article{arxiv.1511.01452,
title = {Same-Sign Dilepton Excesses and Vector-like Quarks},
author = {Chuan-Ren Chen and Hsin-Chia Cheng and Ian Low},
journal= {arXiv preprint arXiv:1511.01452},
year = {2016}
}
Comments
1+17 pages and 11 figures