Observability of an ultraheavy diquark decaying into vectorlike quarks at the LHC
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866913131312185344 |
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| author | Costache, Daniel C. Alexa, Calin Dinu, Anca M. Dinu, Ioan M. Duminica, Ioana Filip, Matei S. Majeri, Gabriel C. |
| author_facet | Costache, Daniel C. Alexa, Calin Dinu, Anca M. Dinu, Ioan M. Duminica, Ioana Filip, Matei S. Majeri, Gabriel C. |
| contents | We present a comprehensive analysis of the discovery reach and exclusion limits for an ultraheavy diquark scalar (7-9.5 TeV) decaying into a pair of vectorlike quarks (1.5-2 TeV) at the HL-LHC. Building on an improved signal selection efficiency achieved using Machine Learning techniques, we extend our previous six-jet final-state study by providing a complete likelihood-based statistical treatment of this search topology. The analysis incorporates theoretical and systematic uncertainties through nuisance parameters within the likelihood framework, enabling a consistent statistical interpretation. The mass regions of interest were determined through scans of the local $p$-values, $CL_s$, and the upper limits on the model-dependent signal strength $μ$. The results indicate a promising sensitivity to ultraheavy diquark scalars within the explored mass range, suggesting that the HL-LHC could either discover or set stringent exclusion limits on such particles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_02474 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observability of an ultraheavy diquark decaying into vectorlike quarks at the LHC Costache, Daniel C. Alexa, Calin Dinu, Anca M. Dinu, Ioan M. Duminica, Ioana Filip, Matei S. Majeri, Gabriel C. High Energy Physics - Phenomenology High Energy Physics - Experiment We present a comprehensive analysis of the discovery reach and exclusion limits for an ultraheavy diquark scalar (7-9.5 TeV) decaying into a pair of vectorlike quarks (1.5-2 TeV) at the HL-LHC. Building on an improved signal selection efficiency achieved using Machine Learning techniques, we extend our previous six-jet final-state study by providing a complete likelihood-based statistical treatment of this search topology. The analysis incorporates theoretical and systematic uncertainties through nuisance parameters within the likelihood framework, enabling a consistent statistical interpretation. The mass regions of interest were determined through scans of the local $p$-values, $CL_s$, and the upper limits on the model-dependent signal strength $μ$. The results indicate a promising sensitivity to ultraheavy diquark scalars within the explored mass range, suggesting that the HL-LHC could either discover or set stringent exclusion limits on such particles. |
| title | Observability of an ultraheavy diquark decaying into vectorlike quarks at the LHC |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2511.02474 |