Same-sign dilepton excesses and vector-like quarks

Chuan Ren Chen, Hsin Chia Cheng, Ian Low

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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
Volume2016
Issue number3
DOIs
Publication statusPublished - 2016 Mar 1

Fingerprint

quarks
particle production
decay
supersymmetry
parity
bosons
topology
energy

Keywords

  • Hadronic Colliders
  • Phenomenological Models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Same-sign dilepton excesses and vector-like quarks. / Chen, Chuan Ren; Cheng, Hsin Chia; Low, Ian.

In: Journal of High Energy Physics, Vol. 2016, No. 3, 98, 01.03.2016.

Research output: Contribution to journalArticle

Chen, Chuan Ren ; Cheng, Hsin Chia ; Low, Ian. / Same-sign dilepton excesses and vector-like quarks. In: Journal of High Energy Physics. 2016 ; Vol. 2016, No. 3.
@article{59f652e91f6f4b828d6760694b995aff,
title = "Same-sign dilepton excesses and vector-like quarks",
abstract = "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.",
keywords = "Hadronic Colliders, Phenomenological Models",
author = "Chen, {Chuan Ren} and Cheng, {Hsin Chia} and Ian Low",
year = "2016",
month = "3",
day = "1",
doi = "10.1007/JHEP03(2016)098",
language = "English",
volume = "2016",
journal = "Journal of High Energy Physics",
issn = "1126-6708",
publisher = "Springer Verlag",
number = "3",

}

TY - JOUR

T1 - Same-sign dilepton excesses and vector-like quarks

AU - Chen, Chuan Ren

AU - Cheng, Hsin Chia

AU - Low, Ian

PY - 2016/3/1

Y1 - 2016/3/1

N2 - 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.

AB - 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.

KW - Hadronic Colliders

KW - Phenomenological Models

UR - http://www.scopus.com/inward/record.url?scp=84961250472&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84961250472&partnerID=8YFLogxK

U2 - 10.1007/JHEP03(2016)098

DO - 10.1007/JHEP03(2016)098

M3 - Article

AN - SCOPUS:84961250472

VL - 2016

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 3

M1 - 98

ER -