ALP-ine quests at the LHC: hunting axion-like particles via peaks and dips in tt¯ production
We present an analysis of the sensitivity of current and future LHC searches for new spin-0 particles in top–anti-top-quark tt¯ final states, focusing on generic axion-like particles (ALPs) that are coupled to top quarks and gluons. As a first step, we derive new limits on the effective ALP Lagrangi...
| Autores: | , , , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2024 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositório: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/382071 |
| Acesso em linha: | http://hdl.handle.net/10261/382071 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85214379715&doi=10.1007%2fJHEP12%282024%29197&partnerID=40&md5=8b0e6af861b168b5033feaa0e6afb678 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Axions and ALPs Multi-Higgs Models Specific BSM Phenomenology Top Quark |
| Resumo: | We present an analysis of the sensitivity of current and future LHC searches for new spin-0 particles in top–anti-top-quark tt¯ final states, focusing on generic axion-like particles (ALPs) that are coupled to top quarks and gluons. As a first step, we derive new limits on the effective ALP Lagrangian in terms of the Wilson coefficients ct and cG~ based on the results of the CMS search using 35.9 fb−1 of data, collected at s = 13 TeV. We then investigate how the production of an ALP with generic couplings to gluons and top quarks can be distinguished from the production of a pseudoscalar which couples to gluons exclusively via a top-quark loop. To this end, we make use of the invariant tt¯ mass distribution and angular correlations that are sensitive to the tt¯ spin correlation. Using a mass of 400 GeV as an example, we find that already the data collected during Run 2 and Run 3 of the LHC provides an interesting sensitivity to the underlying nature of a possible new particle. We also analyze the prospects for data anticipated to be collected during the high-luminosity phase of the LHC. Finally, we compare the limits obtained from the tt¯ searches to existing experimental bounds from LHC searches for narrow di-photon resonances, from measurements of the production of four top quarks, and from global analyses of ALP–SMEFT interference effects. © The Author(s) 2024. |
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