Abstract
We present a new way to interpret Top Standard Model measurements going beyond the SMEFT framework. Instead of the usual paradigm in Top EFT, where the main effects come from tails in momenta distributions, we propose an interpretation in terms of new physics which only shows up at loop-level. The effects of these new states, which can be lighter than required within the SMEFT, appear as distinctive structures at high momenta, but may be suppressed at the tails of distributions. As an illustration of this phenomena, we present the explicit case of a UV model with a \( \mathcal{Z} \)2 symmetry, including a Dark Matter candidate and a top-partner. This simple UV model reproduces the main features of this class of signatures, particularly a momentum-dependent form factor with more structure than the SMEFT. As the new states can be lighter than in SMEFT, we explore the interplay between the reinterpretation of direct searches for colored states and Dark Matter, and Top measurements, made by ATLAS and CMS in the differential \( t\overline{t} \) final state. We also compare our method with what one would expect using the SMEFT reinterpretation, finding that using the full loop information provides a better discriminating power.
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Acknowledgments
We would like to thank Maeve Madigan for her help with the reinterpretation of the ATLAS and CMS top analyses and Johnathon Gargalionis for his help with the EFT matching procedure. A.L. is supported by FAPESP grants no. 2018/25225-9 and 2021/01089-1. The research of VS is supported by the Generalitat Valenciana PROMETEO/2021/083 and the Ministerio de Ciencia e Innovacion PID2020-113644GB-I00.
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Lessa, A., Sanz, V. Going beyond Top EFT. J. High Energ. Phys. 2024, 107 (2024). https://doi.org/10.1007/JHEP04(2024)107
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DOI: https://doi.org/10.1007/JHEP04(2024)107