Heavy vector-like quarks decaying to exotic scalars: a case study with triplets

Banerjee, Avik; Ellajosyula, Venugopal; Panizzi, Luca

doi:10.1007/jhep01(2024)187

Cited by 4 publications

(1 citation statement)

References 118 publications

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“…The presence of the VLQ-X with mass of approximately 1.33 (1.30) TeV is excluded at 95% confidence level (CL) for the case of right (left)-handed couplings to W bosons. Such mass bounds could be relaxed if some new decay modes are possible in some NP models [38][39][40], that is, , , and in some realistic composite Higgs models (see, for example [41][42][43][44]).…”

Section: Introductionmentioning

confidence: 99%

Search for an exotic vectorlike X-quark in same-sign dilepton final states at the future 3 TeV CLIC*

Zhang 张,

Chang 常,

Liu 刘

2024

Chinese Phys. C

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Vectorlike quarks~(VLQs) with masses at the TeV-scale have been predicted in many new physics scenarios beyond the Standard Model~(SM). Based on a simplified $\left(X,T\right)$ doublet model including the exotic vectorlike $X$ quark~(VLQ-$X$) with electric charge $5/3$, we study the production of the VLQ-$X$ decaying into $tW$ at the future Compact Linear Collider~(CLIC) with $\sqrt{s}=3$ TeV including the initial state radiation and beamstrahlung effects. We focus on the final signals including same-sign dilepton~(electrons or muons), at least one $b$-tagged jet and large missing transverse momentum.By performing a detailed signal-to-background analyses and detector simulations, we obtain the $2\sigma$ exclusion capabilities and the $5\sigma$ discovery reaches, respectively, on the mass of VLQ-$X$ $m_{X}$ and the relevant parameters~($Br(X\to tW)$ for $m_{X}<1500$~GeV and the coupling strength $g^{*}$ for $m_{X}\geq1500$~GeV) for some typical luminosities at 3 TeV CLIC.

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Section: Introductionmentioning

confidence: 99%

Search for an exotic vectorlike X-quark in same-sign dilepton final states at the future 3 TeV CLIC*

Zhang 张,

Chang 常,

Liu 刘

2024

Chinese Phys. C

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Single production of an exotic vectorlike Y quark at future high energy pp colliders

Shang,

Yan,

Moretti

et al. 2024

Phys. Rev. D

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Vectorlike quarks have been predicted in various new physics scenarios beyond the Standard Model. In a simplified modelling of a (B,Y) doublet including a vectorlike quark Y, with charge −43e, there are only two free parameters: the Y coupling κY and mass mY. In the five flavor scheme, we investigate the single production of the Y state decaying into Wb at the Large Hadron Collider (LHC) run-III and High-Luminosity LHC (HL-LHC) operating at s=14 TeV, the possible High-Energy LHC (HE-LHC) with s=27 TeV as well as the Future Circular Collider in hadron-hadron mode (FCC-hh) with s=100 TeV. Through detailed signal-to-background analyses and detector simulations, we assess the exclusion capabilities of the Y state at the different colliders. We find that this can be improved significantly with increasing collision energy, especially at the HE-LHC and FCC-hh, both demonstrating an obvious advantage with respect to the HL-LHC in the case of high mY. Assuming a 10% systematic uncertainty on the background event rate, the exclusion capabilities are summarized as follows: (1) the LHC run-III can exclude the correlated regions of κY∈[0.06,0.5] and mY∈[1500 GeV,3800 GeV] with integrated luminosity L=300 fb−1; (2) the HL-LHC can exclude the correlated regions of κY∈[0.05,0.5] and mY∈[1500 GeV,3970 GeV] with L=3 ab−1; (3) the HE-LHC can exclude the correlated regions of κY∈[0.06,0.5] and mY∈[1500 GeV,6090 GeV] with L=3 ab−1; (4) the FCC-hh can exclude the correlated regions of κY∈[0.08,0.5] and mY∈[1500 GeV,10080 GeV] with L=3 ab−1. Published by the American Physical Society 2024

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Search for single vector-like B quark production in hadronic final states at the LHC

Yang,

Li,

Jia

et al. 2024

Eur. Phys. J. C

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In this paper, we study the discovery potential of a Vector-Like B quark (VLB) via the process $$pp \rightarrow B(\rightarrow bZ)j\rightarrow b(Z \rightarrow \nu _l\bar{\nu _l})j$$ p p → B ( → b Z ) j → b ( Z → ν l ν l ¯ ) j at the Large Hadron Collider (LHC) with $$\sqrt{s}=14$$ s = 14 TeV. In the framework of a simplified model, we perform a scan over its parameter space and test its viability following a Monte Carlo analysis developed to include all production and decay dynamics. We use cut-and-count combined with Extreme Gradient Boosting (XGBoost) methods to classify the signal and background events in order to improve the efficiency of signal identification and background rejection. We find that this approach can reduce background events significantly while the signal retention rate is much higher than that of traditional methods, thereby improving the VLB discovery potential. We then calculate the exclusion and discovery capabilities for VLBs and find that the advantages of the cut-and-count plus XGBoost method especially lie in the high-mass region, i.e., $$m_B > 1500 \text { GeV}$$ m B > 1500 GeV . We finally obtain the following LHC results in terms of the coupling and chiral structure of a singlet heavy VLB interactions: (i) for $$g^{*}=0.2$$ g ∗ = 0.2 and $$R_L=0$$ R L = 0 with 3000 fb$$^{-1}$$ - 1 , the B quark mass can be be excluded (discovered) up to 3000 GeV (2500 GeV); (ii) for $$g^{*}=0.2$$ g ∗ = 0.2 and $$R_L=0.5$$ R L = 0.5 with 3000 fb$$^{-1}$$ - 1 , the exclusion (discovery) region can reach up to 4750 GeV (4250 GeV).

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Heavy vector-like quarks decaying to exotic scalars: a case study with triplets

Cited by 4 publications

References 118 publications

Search for an exotic vectorlike X-quark in same-sign dilepton final states at the future 3 TeV CLIC*

Search for an exotic vectorlike X-quark in same-sign dilepton final states at the future 3 TeV CLIC*

Single production of an exotic vectorlike Y quark at future high energy pp colliders

Search for single vector-like B quark production in hadronic final states at the LHC

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