Abstract
Searches for anomalous neutral triple gauge boson couplings (NTGCs) provide important tests for the gauge structure of the standard model. In SMEFT (“standard model effective field theory”) NTGCs appear only at the level of dimension-8 operators. While the phenomenology of these operators has been discussed extensively in the literature, renormalizable UV models that can generate these operators are scarce. In this work, we study a variety of extensions of the SM with heavy fermions and calculate their matching to d = 8 NTGC operators. We point out that the complete matching of UV models requires four different CP-conserving d = 8 operators and that the single CPC d = 8 operator, most commonly used by the experimental collaborations, does not describe all possible NTGC form factors. Despite stringent experimental constraints on NTGCs, limits on the scale of UV models are relatively weak, because their contributions are doubly suppressed (being d = 8 and 1-loop). We suggest a series of benchmark UV scenarios suitable for interpreting searches for NTGCs in the upcoming LHC runs, obtain their current limits and provide estimates for the expected sensitivity of the high-luminosity LHC.
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Acknowledgments
We would like to thank José Santiago for help with the tool MatchMakerEFT [7] and Javier Fuentes-Martín, Julie Pagès and Anders Eller Thomsen for help with Matchete [35].
F.E. is supported by the Generalitat Valenciana under the grants GRISOLIAP/2020/145 and PROMETEO/2021/083. The research of V.S. is supported by the Generalitat Valenciana PROMETEO/2021/083 and the Ministerio de Ciencia e Innovacion PID2020-113644GB-I00. M.H. acknowledges support by grants PID2020-113775GB-I00 (AEI/10.13039/501100011033) and CIPROM/2021/054 (Generalitat Valenciana). R.C. is supported by MCIN/AEI/10.13039/501100011033 and the European Union NextGenerationEU/PRTR under the grant JDC2022-048687-I and partially funded by Grant AST22_6.5 (Consejería de Universidad, Investigación e Innovación and Gobierno de España and Unión Europea — NextGenerationEU).
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Cepedello, R., Esser, F., Hirsch, M. et al. Fermionic UV models for neutral triple gauge boson vertices. J. High Energ. Phys. 2024, 275 (2024). https://doi.org/10.1007/JHEP07(2024)275
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DOI: https://doi.org/10.1007/JHEP07(2024)275