ATLAS on- Z excess through vector-like quarks

Endo, Motoi; Takaesu, Yoshitaro

doi:10.1016/j.physletb.2016.05.030

Cited by 7 publications

(2 citation statements)

References 54 publications

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“…GeV , (18) where r i = m 2 i /m 2 X and we denote the sine and cosine of the mixing angle θ R by s R = sin θ R and c R = cos θ R , respectively. ‡ The vector-like T can decay to either the SM Higgs or to a Z boson ‡ A corresponding, but somewhat more complex expression exists when X decays instead to tRW .…”

Section: Upon Diagonalization the Mass Of The Heavy New Quark T Is Gimentioning

confidence: 99%

“…Interestingly, another hint of new physics appears in the ATLAS supersymmetric gluino searches at both 8 and 13 TeV where an on-shell Z-boson is produced together with jets and missing E T in a cascade decay [16,17]. Motivated by this possibility, we address a question that has been investigated in the literature as to whether or not the production of VLQ states can simultaneously 3 explain both this apparent signal as well as mediate the potential diphoton excess (e.g., [18]). To address this issue in our study we perform a combined fit to both the ATLAS and CMS on-shell Zboson + MET searches together with a large set of other supersymmetric particle search channels.…”

Section: Introductionmentioning

confidence: 97%

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Complementarity of resonant scalar, vector-like quark and superpartner searches in elucidating new phenomena

Biekötter

Weber

Kim

et al. 2017

Int. J. Mod. Phys. A

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The elucidation of the nature of new phenomena requires a multi-pronged approach to understand the essential physics that underlies it. As an example, we study the simplified model containing a new scalar singlet accompanied by vector-like quarks, as motivated by the recent diphoton excess at the LHC. To be specific, we investigate three models with SU (2) L -doublet, vector-like quarks with Yukawa couplings to a new scalar singlet and which also couple off-diagonally to corresponding Standard Model fermions of the first or third generation through the usual Higgs boson. We demonstrate that three classes of searches can play important and complementary roles in constraining this model. In particular, we find that missing energy searches designed for superparticle production, supply superior sensitivity for vector-like quarks than the dedicated new quark searches themselves. CONTENTS

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Section: Upon Diagonalization the Mass Of The Heavy New Quark T Is Gimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Complementarity of resonant scalar, vector-like quark and superpartner searches in elucidating new phenomena

Biekötter

Weber

Kim

et al. 2017

Int. J. Mod. Phys. A

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Search for single production of vector-like top partners at the Large Hadron Electron Collider

Liu¹

2017

Nuclear Physics B

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The new vector-like top partners with charge 2/3 are a typical feature of many new physics models beyond the Standard Model (SM). We propose a search strategy for single production of top partners T focusing on both the T → W b and T → th decay channels at the Large Hadron Electron Collider (LHeC). Our analysis is based on a simplified model in which the top partner is an SU (2) singlet, with couplings only to the third generation of SM quarks. We study the observability of the single T through the processes e + p → T (→ bW + )ν e → bℓ + + / Eat the LHeC with the proposed 140 GeV electron beam (with 80% polarization) and 7 TeV proton beam. For three typical T -quark masses (800, 900 and 1000 GeV), the 3σ exclusion limits on the T W b coupling are respectively presented for various values of the integrated luminosity.

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