Measuring anomalous WW$\gamma$ and t$\bar{\text{t}}\gamma$ couplings using top+$\gamma$ production at the LHC

Abstract

We consider the electroweak production of a top quark in association with a photon at the LHC to probe the electroweak top quark couplings (t$\bar{\text{t}}\gamma$) as well as the triple gauge boson couplings (WW$\gamma$). The study is based on the modifications of the t$\bar{\text{t}}\gamma$ and WW$\gamma$ interactions via heavy degrees of freedom in the form of dimension-six operators which we add to the standard model Lagrangian. A binned angular asymmetry in single top quark plus photon events and cross section ratio are proposed to probe the anomalous t$\bar{\text{t}}\gamma$ and WW$\gamma$ couplings. It is shown that the proposed angular asymmetry can distinguish anomalous t$\bar{\text{t}}\gamma$, WW$\gamma$ couplings from the standard model prediction and yield a great sensitivity.

15 pages, 8 figures and 2 tables, published version

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• Bounds on the non-standard $W^{+}{W}^{-}\gamma$ couplings at the LHeC and the FCC-he
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• Sensitivity analysis for the anomalous $W^{+}{W}^{-}\gamma$ couplings at the LHeC and the FCC-he
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• Probing the anomalous electromagnetic dipole moments of the top quark in $\gamma p$ collision at the LHC, the HL-LHC and the HE-LHC
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• Search for the anomalous $WW\gamma$ couplings through the process $e^{-}{e}^{+}\to {\nu }_e{\bar{\nu }}_e\gamma$ at ILC with unpolarized and polarize beams
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• One-loop amplitudes for $t\bar{t}j$ and $t\bar{t}\gamma$ productions at the LHC through $\mathcal{O}({\epsilon }^2)$
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