Abstract
We study the LHC phenomenology of an Axion Like Particle (ALP) that couples only derivatively with the top quark at tree level. We inspect the radiatively induced couplings with the SM fermions and (gauge) bosons and the associated production and decay mechanisms of the ALP. We focus on the most challenging mass window that remains open for a top-philic ALP, i.e., the range between tens and hundreds of GeV. Not only ALP production processes but also virtual ALP contributions to final states with top quarks are considered in detail. We show how searches through resonant production, such as ALP production in association with a \( t\overline{t} \) pair, are complementary to precision measurements of \( t\overline{t} \) and \( t\overline{t}t\overline{t} \) final states, the latter being competitive or even more powerful for a top-philic ALP in this mass window. Finally, we explore the scenario where the top-philic ALP acts as a mediator to a dark-matter sector, resulting in missing energy signatures at the LHC. We find that the LHC constraints from \( t\overline{t} \), \( t\overline{t}t\overline{t} \) and ALP + jet production, together with those from \( t\overline{t} \) + ALP production, can already exclude a large fraction of the parameter space leading to the correct relic abundance.
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Acknowledgments
We thank Ilaria Brivio and Jesus Bonilla for many insightful discussions. DP and ST thank the Galileo Galilei Institute for Theoretical Physics for the hospitality during the completion of this work. FM is grateful to Alessandro Vicini for help with POWHEG. SB thanks Marco Gorghetto, Hyungjin Kim and Andrea Mitridate for useful discussions. SB and AM are supported in part by the Strategic Research Program High-Energy Physics of the Research Council of the Vrije Universiteit Brussel and by the iBOF “Unlocking the Dark Universe with Gravitational Wave Observations: from Quantum Optics to Quantum Gravity” of the Vlaamse Interuniversitaire Raad. SB, FM and AM are supported in part by the “Excellence of Science - EOS” - be.h project n.30820817. SB is in part supported by FWO-Vlaanderen through grant numbers 12B2323N. This work is supported by the Deutsche Forschungsgemeinschaft under Germany’s Excellence Strategy - EXC 2121 Quantum Universe - 390833306. KM is supported by an Ernest Rutherford Fellowship from the Science and Technologies Facilities Council (STFC), grant No. ST/X004155/1, and was previously supported by STFC grant No. ST/T000759/1. ST is supported by a FRIA (Fonds pour la forma- tion ‘a la Recherche dans l’Industrie et dans l’Agriculture) Grant of the Belgian Fund for Research, F.R.S.-FNRS (Fonds de la Recherche Scientifique-FNRS)
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Blasi, S., Maltoni, F., Mariotti, A. et al. Top-philic ALP phenomenology at the LHC: the elusive mass-window. J. High Energ. Phys. 2024, 77 (2024). https://doi.org/10.1007/JHEP06(2024)077
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DOI: https://doi.org/10.1007/JHEP06(2024)077