Quark flavor violation and axion-like particles from top-quark decays at the LHC
Abstract We study axion-like particles (ALPs) with quark-flavor-violating couplings at the LHC. Specifically, we focus on the theoretical scenario with ALP-top-up and ALP-top-charm interactions, in addition to the more common quark-flavor-diagonal couplings. The ALPs can thus originate from decays o...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-07-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP07(2024)209 |
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| author | Kingman Cheung Fei-Tung Chung Giovanna Cottin Zeren Simon Wang |
| author_facet | Kingman Cheung Fei-Tung Chung Giovanna Cottin Zeren Simon Wang |
| author_sort | Kingman Cheung |
| collection | DOAJ |
| description | Abstract We study axion-like particles (ALPs) with quark-flavor-violating couplings at the LHC. Specifically, we focus on the theoretical scenario with ALP-top-up and ALP-top-charm interactions, in addition to the more common quark-flavor-diagonal couplings. The ALPs can thus originate from decays of top quarks which are pair produced in large numbers at the LHC, and then decay to jets. If these couplings to the quarks are tiny and the ALPs have O 10 $$ \mathcal{O}(10) $$ GeV masses, they are long-lived, leading to signatures of displaced vertex plus multiple jets, which have the advantage of suppression of background events at the LHC. We recast a recent ATLAS search for the same signature and reinterpret the results in terms of bounds on the long-lived ALP in our theoretical scenario. We find that the LHC with the full Run 2 dataset can place stringent limits, while at the future high-luminosity LHC with 3 ab−1 integrated luminosity stronger sensitivities are expected. |
| format | Article |
| id | doaj-art-7f048bfcd6b54c079b05b66afaa71d1c |
| institution | OA Journals |
| issn | 1029-8479 |
| language | English |
| publishDate | 2024-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-7f048bfcd6b54c079b05b66afaa71d1c2025-08-20T02:11:28ZengSpringerOpenJournal of High Energy Physics1029-84792024-07-012024712510.1007/JHEP07(2024)209Quark flavor violation and axion-like particles from top-quark decays at the LHCKingman Cheung0Fei-Tung Chung1Giovanna Cottin2Zeren Simon Wang3Department of Physics, National Tsing Hua UniversityDepartment of Physics, National Tsing Hua UniversityInstituto de Física, Pontificia Universidad Católica de ChileDepartment of Physics, National Tsing Hua UniversityAbstract We study axion-like particles (ALPs) with quark-flavor-violating couplings at the LHC. Specifically, we focus on the theoretical scenario with ALP-top-up and ALP-top-charm interactions, in addition to the more common quark-flavor-diagonal couplings. The ALPs can thus originate from decays of top quarks which are pair produced in large numbers at the LHC, and then decay to jets. If these couplings to the quarks are tiny and the ALPs have O 10 $$ \mathcal{O}(10) $$ GeV masses, they are long-lived, leading to signatures of displaced vertex plus multiple jets, which have the advantage of suppression of background events at the LHC. We recast a recent ATLAS search for the same signature and reinterpret the results in terms of bounds on the long-lived ALP in our theoretical scenario. We find that the LHC with the full Run 2 dataset can place stringent limits, while at the future high-luminosity LHC with 3 ab−1 integrated luminosity stronger sensitivities are expected.https://doi.org/10.1007/JHEP07(2024)209Axions and ALPsNew Light ParticlesTop FCNC |
| spellingShingle | Kingman Cheung Fei-Tung Chung Giovanna Cottin Zeren Simon Wang Quark flavor violation and axion-like particles from top-quark decays at the LHC Journal of High Energy Physics Axions and ALPs New Light Particles Top FCNC |
| title | Quark flavor violation and axion-like particles from top-quark decays at the LHC |
| title_full | Quark flavor violation and axion-like particles from top-quark decays at the LHC |
| title_fullStr | Quark flavor violation and axion-like particles from top-quark decays at the LHC |
| title_full_unstemmed | Quark flavor violation and axion-like particles from top-quark decays at the LHC |
| title_short | Quark flavor violation and axion-like particles from top-quark decays at the LHC |
| title_sort | quark flavor violation and axion like particles from top quark decays at the lhc |
| topic | Axions and ALPs New Light Particles Top FCNC |
| url | https://doi.org/10.1007/JHEP07(2024)209 |
| work_keys_str_mv | AT kingmancheung quarkflavorviolationandaxionlikeparticlesfromtopquarkdecaysatthelhc AT feitungchung quarkflavorviolationandaxionlikeparticlesfromtopquarkdecaysatthelhc AT giovannacottin quarkflavorviolationandaxionlikeparticlesfromtopquarkdecaysatthelhc AT zerensimonwang quarkflavorviolationandaxionlikeparticlesfromtopquarkdecaysatthelhc |