Same-sign dilepton excesses and vector-like quarks

Chen, Chuan-Ren; Cheng, Hsin-Chia; Low, Ian

doi:10.1007/JHEP03(2016)098

Same-sign dilepton excesses and vector-like quarks

Journal Article · Tue Mar 15 00:00:00 EDT 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP03(2016)098· OSTI ID:1336261

Chen, Chuan-Ren ^[1]; Cheng, Hsin-Chia ^[2]; Low, Ian ^[3]

National Taiwan Normal Univ., Taipei (Taiwan). Dept. of Physics
Univ. of California, Davis, CA (United States). Dept. of Physics
Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy; Argonne National Lab. (ANL), Argonne, IL (United States). High Energy Physics Division

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. In conclusion, we also comment on the possibility to fit excesses in different analyses in a common framework.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Grant/Contract Number:: AC02-06CH11357; SC0010143

OSTI ID:: 1336261

Alternate ID(s):: OSTI ID: 22605084

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 3 Vol. 2016; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Exotic signals of vectorlike quarks Dobrescu, Bogdan A.; Yu, Felix Journal of Physics G: Nuclear and Particle Physics, Vol. 45, Issue 8 https://doi.org/10.1088/1361-6471/aacbfd	journal	June 2018
Exotic Signals of Vectorlike Quarks Dobrescu, Bogdan A.; Yu, Felix arXiv https://doi.org/10.48550/arxiv.1612.01909	text	January 2016

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