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arXiv · 2511.02474

Observability of an ultraheavy diquark decaying into vectorlike quarks at the LHC

Daniel C. Costache·Calin Alexa·Anca M. Dinu·Ioan M. Dinu·Ioana Duminica·Matei S. Filip·Gabriel C. Majeri
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Abstract

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 $\mu$. 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.

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Daniel C. Costache, Calin Alexa, Anca M. Dinu, Ioan M. Dinu, Ioana Duminica, Matei S. Filip, Gabriel C. Majeri. 2025-11-04. Observability of an ultraheavy diquark decaying into vectorlike quarks at the LHC. https://doi.org/10.1103/qxhl-4pqz

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