Leptoquark-vectorlike quark model for the CDF 
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Chowdhury, Talal Ahmed; Saad, Shaikh

doi:10.1103/physrevd.106.055017

Cited by 20 publications

(2 citation statements)

References 161 publications

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“…Additionally, the CDF II Collaboration recently reported the measured mass of W gauge boson as m W = 80.4335 ± 0.0094 GeV [64], where the SM prediction is m W = 80.361 GeV [65]. If the W-mass anomaly is confirmed by the measurements at the LHC with more cumulative data, it would be a solid piece of evidence for new physics [66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84] Based on the above introduction, we investigate in this work a new physics model that can enhance the top-FCNC and LFV processes, potentially up to the experimental sensitivities mentioned earlier. Furthermore, we will show that, after all possible constraints are taken into account, these new physics effects can lead to Δa μ of 10 9 ( )…”

Section: Introductionmentioning

confidence: 94%

Top-quark FCNC decays, LFVs, lepton g − 2, and W mass anomaly with inert charged Higgses

Chen,

Chiang,

2024

J. Phys. G: Nucl. Part. Phys.

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The observed flavor-changing neutral-current (FCNC) processes in the standard model (SM) arise from the loop diagrams involving the weak charged currents mediated by the W-gauge boson. Nevertheless, the top-quark FCNCs and lepton flavor-violating processes resulting from the same mechanism are highly suppressed. We investigate possible new physics effects that can enhance the suppressed FCNC processes, such as a top quark decaying into a light quark with a Higgs or gauge boson in the final state, i.e. t → q(h, V) with V = γ, Z, g, h → ℓ ℓ ′ , and ℓ → ℓ ′ γ . To achieve the assumption that the induced FCNCs are all from quantum loops, we consider the scotogenic mechanism, where a Z 2 symmetry is introduced and only new particles carry an odd Z 2 parity. With the extension of the SM to include an inert Higgs doublet, an inert charged Higgs singlet, a vector-like singlet quark, and two neutral leptons, it is found that, with relevant constraints taken into account, the t → c(h, Z), h → μ τ, and τ → ℓ γ decays can be enhanced up to the expected sensitivities in experiments. The branching ratios of h → μ + μ −/τ + τ − from only new physics effects can reach up to O ( 10 − 3 ) . Intriguingly, the resulting muon g − 2 can fit the combined data within 2 standard deviations, whereas the electron g − 2 can have either sign with a magnitude of O ( 10 − 13 − 10 − 12 ) . In addition, we examine the oblique parameters in the model and find that the resulting W-mass anomaly observed by CDF II can be accommodated.

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Section: Introductionmentioning

confidence: 94%

Top-quark FCNC decays, LFVs, lepton g − 2, and W mass anomaly with inert charged Higgses

Chen,

Chiang,

2024

J. Phys. G: Nucl. Part. Phys.

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“…For the 1.5 TeV and 2.5 TeV scale VLQ pair production [59−61], the cross section can be and at the 13 TeV LHC. For the single LQ and VLQ production channels, they depend on the electroweak couplings [42,62,63]. In the parameter space of large LQ Yukawa couplings, the single LQ production can be important, which may give some constraints at HL-LHC.…”

Section: Lq and Vlq Phenomenology At Hadron Collidersmentioning

confidence: 99%

Scalar leptoquark and vector-like quark extended models as the explanation of the muon $g-2$ anomaly: bottom partner chiral enhancement case

2023

Chinese Phys. C

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Leptoquark (LQ) models are well motivated solutions to the $(g-2)_{\mu}$ anomaly. In the minimal LQ models, only specific representations can lead to the chiral enhancements. For the scalar LQs, the $R_2$ and $S_1$ can lead to the top quark chiral enhancement. For the vector LQs, the $V_2$ and $U_1$ can lead to the bottom quark chiral enhancement. When we consider the LQ and vector-like quark (VLQ) simultaneously, there can be more scenarios. In our previous work, we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement. Here, we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement. We find two new models with $B$ quark chiral enhancement, which originate from the bottom and bottom partner mixing. Then, we propose new LQ and VLQ search channels under the constraints of $(g-2)_{\mu}$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Global fit of modified quark couplings to EW gauge bosons and vector-like quarks in light of the Cabibbo angle anomaly

Crivellin

Kirk

Kitahara

et al. 2023

J. High Energ. Phys.

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There are two tensions related to the Cabibbo angle of the CKM matrix. First, the determinations of Vus from Kμ2, Kℓ3, and τ decays disagree at the 3σ level. Second, using the average of these results in combination with β decays (including super-allowed β decays and neutron decay), a deficit in first-row CKM unitarity with a significance of again about 3σ is found. These discrepancies, known as the Cabibbo Angle anomaly, can in principle be solved by modifications of W boson couplings to quarks. However, due to SU(2)L invariance, Z couplings to quarks are also modified and flavour changing neutral currents can occur. In order to consistently assess the agreement of a new physics hypothesis with data, we perform a combined analysis for all dimension-six Standard Model Effective Field Theory operators that generate modified W couplings to first and second generation quarks. We then study models with vector-like quarks, which are prime candidates for a corresponding UV completion as they can affect W -quark couplings at tree level, and we perform a global fit including flavour observables (in particular loop effects in ∆F = 2 processes). We find that the best fit can be obtained for the SU(2)L doublet vector-like quark Q as it can generate right-handed W-u-d and W-u-s couplings as preferred by data.

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Leptoquark-vectorlike quark model for the CDF mW , (g−2)μ ,

Cited by 20 publications

References 161 publications

Top-quark FCNC decays, LFVs, lepton g − 2, and W mass anomaly with inert charged Higgses

Top-quark FCNC decays, LFVs, lepton g − 2, and W mass anomaly with inert charged Higgses

Scalar leptoquark and vector-like quark extended models as the explanation of the muon $g-2$ anomaly: bottom partner chiral enhancement case

Global fit of modified quark couplings to EW gauge bosons and vector-like quarks in light of the Cabibbo angle anomaly

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