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Flavour-changing top quark decays in the alternative left-right model

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arxiv 2312.12523 v2 pith:B5VBJT2E submitted 2023-12-19 hep-ph hep-ex

classification hep-phhep-ex
keywords modeldecaysalternativebranchingexoticflavour-changingleft-rightmathcal
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abstract

We examine flavour-changing neutral-current decays of the top quark, $t\to q \gamma$, $t \to qZ$, $t \to q H$, and $ t\to q g$ (with $q=u, c$), in the Alternative Left-Right Model, a left right-symmetric model featuring exotic quarks and light bosons. These decays have a very small probability of occurring within the Standard Model, but they can be enhanced in this model through the presence of the exotic states. While associated signals may be detected directly at the LHC, rare decays have the advantage of offering means to probe new particles indirectly, through loop-contributions. We perform a comprehensive analysis of the model's parameter space to demonstrate the possible existence of enhancements in the corresponding branching ratios, of $10^6$ for the branching ratios $\mathcal{B}(t\to uZ)$ and $\mathcal{B}(t \to uH)$, and in the range of $10^{2} - 10^{4}$ for the other decays, relative to the Standard Model. We subsequently determine the preferred parameter space regions of the model in terms of potential of being reached in the near future.

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  1. Targets for Flavor-Violating Top Decay

    hep-ph 2025-04 accept novelty 6.0 of 10

    In leptoquark-like new physics, rare top decays to quarks and electron/muon pairs are predicted to occur at branching ratios of about 10^-8 to 10^-6, putting some within reach of LHC searches.

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