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

Abstract

We examine flavour-changing neutral-current decays of the top quark, $t\to q\gamma$, $t\to qZ$, $t\to qH$, and $t\to qg$ (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.

8 pages, 2 figures; v2: some clarifications and references added, Matches the published version

References in corpus (16)

• A global approach to top-quark flavor-changing interactions
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• New Physics effects in the flavor-changing neutral couplings of the Top quark
• Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions
• Scalar FCNC and rare top decays in a two Higgs doublet model "for the top"
• Search for production of single top quarks via flavor-changing neutral currents at the Tevatron
• Large $t\to cZ$ as a Sign of Vector-Like Quarks in Light of the $W$ Mass
• Rare Top-quark Decays to Higgs boson in MSSM
• Feynman Diagram Calculations with FeynArts, FormCalc, and LoopTools
• First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at $\sqrt{s}=$ 13 TeV
• Exploring $0\nu \beta \beta$ and Leptogenesis in the Alternative Left-Right Model
• Flavour-changing neutral scalar interactions of the top quark
• Loop induced top quark FCNC through top quark and dark matter interactions
• Vacuum Structure of Alternative Left-Right Model
• Leveraging on-shell interference to search for FCNCs of the top quark and the Z boson
• Dark Matter in the Alternative Left Right Model

Cited by in corpus (1)

• Leptonic probes of Alternative Left-Right Symmetric Models