Top partners in little Higgs theories with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>T</mml:mi></mml:math>parity

Cheng, H. C.; Low, Ian; Wang, Lian Tao

doi:10.1103/physrevd.74.055001

Cited by 112 publications

(120 citation statements)

References 47 publications

Supporting

Mentioning

118

Contrasting

Order By: Relevance

“…There have been a few studies in the literature to discuss how to detect this channel at the LHC [6,21], though more detailed Monte Carlo analysis is needed to confirm how well this channel can be detected. It was also pointed out that it could be very challenging to distinguish this production channel with the top-squark (stop) pair productions predicted by the Minimal Supersymmetric Standard Model (MSSM) with the subsequent decay of stop into top quark and the lightest supersymmetric particle (neutralino) [21].…”

Section: ) T −T− Production With T −T− → a H A H Ttmentioning

confidence: 99%

“…Similarly, the heavy T-odd gauge bosons of the electroweak gauge boson partners are also essential components of the Little Higgs mechanism. Many studies [6,12,17,18,19,20,21,22,23] have been presented in the literature on the detection strategies for T-even and/or T-odd partners of top quark and heavy T-odd gauge bosons at high energy colliders. On the other hand, the T-odd SU(2) partners of SM fermions of the first and second generations received so far little attention with respect to collider phenomenology.…”

Section: Phenomenologymentioning

confidence: 99%

See 1 more Smart Citation

Phenomenology of a littlest Higgs model with T parity: Including effects of T-odd fermions

et al. 2006

View full text Add to dashboard Cite

We study the collider phenomenology of a Littlest Higgs model with T-parity.We first stress the important role of the T-odd SU (2) doublet fermions (introduced to make the model T-parity invariant) in high energy scattering processes, suchBecause the mass of the T-odd SU (2) doublet fermions cannot be too heavy to be consistent with low energy data, they can be copiously produced at the CERN Large Hadron Collider (LHC). Therefore, we study the collider phenomenology of the model with emphasis on the contributions of the T-odd fermion to the production of the heavy T-parity partners (either bosons or fermions) of the usual particles at the LHC. The production cross sections and the decay branching ratios of the new heavy particles are classified and various experimental signatures are discussed.

show abstract

Section: ) T −T− Production With T −T− → a H A H Ttmentioning

confidence: 99%

Section: Phenomenologymentioning

confidence: 99%

Phenomenology of a littlest Higgs model with T parity: Including effects of T-odd fermions

et al. 2006

View full text Add to dashboard Cite

show abstract

“…Consequently, the same search applies to many different models, but the mass-reach depends on each model's top partner production cross section. Studies of the tt + E miss T signal for new physics have been performed by many groups in various (fully hadronic, single-lepton) channels in recent years [27,29,[31][32][33][34][35][36][37].…”

Section: Jhep07(2012)110mentioning

confidence: 99%

“…This is possible if the partner is also charged under the symmetry that protects the stability of the dark matter particle. Examples are the little Higgs models with T -parity [25][26][27][28], models with the exotic fourth generation and dark matter [29], models with gauged baryon and lepton numbers [30], and so on. Consequently, the same search applies to many different models, but the mass-reach depends on each model's top partner production cross section.…”

Section: Jhep07(2012)110mentioning

confidence: 99%

Stop the top background of the stop search

Bai

Cheng

Gallicchio

et al. 2012

J. High Energ. Phys.

Self Cite

113

110

View full text Add to dashboard Cite

Abstract:The main background for the supersymmetric stop direct production search comes from Standard Model tt events. For the single-lepton search channel, we introduce a few kinematic variables to further suppress this background by focusing on its dileptonic and semileptonic topologies. All are defined to have end points in the background, but not signal distributions. They can substantially improve the stop signal significance and mass reach when combined with traditional kinematic variables such as the total missing transverse energy. Among them, our variable M W T 2 has the best overall performance because it uses all available kinematic information, including the on-shell mass of both W 's. We see 20%-30% improvement on the discovery significance and estimate that the 8 TeV LHC run with 20 fb −1 of data would be able to reach an exclusion limit of 650-700 GeV for direct stop production, as long as the stop decays dominantly to the top quark and a light stable neutralino. Most of the mass range required for the supersymmetric solution of the naturalness problem in the standard scenario can be covered.

show abstract

“…[25,26,31,32]. It was shown that in order to cut off the contributions to the standard model four-fermion interactions from the Goldstone boson loop, there should be a vector-like T-odd doublet partner for every standard model fermionic doublet.…”

Section: Jhep03(2016)098mentioning

confidence: 99%

Same-sign dilepton excesses and vector-like quarks

Chen

Cheng

Low

2016

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Top partners in little Higgs theories withTparity

Cited by 112 publications

References 47 publications

Phenomenology of a littlest Higgs model with T parity: Including effects of T-odd fermions

Phenomenology of a littlest Higgs model with T parity: Including effects of T-odd fermions

Stop the top background of the stop search

Same-sign dilepton excesses and vector-like quarks

Contact Info

Product

Resources

About