HL-LHC sensitivity to an ultraheavy $S_{uu}$ diquark in the $uχ$ channel
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911379565314048 |
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| author | Filip, Matei S. Alexa, Calin Costache, Daniel C. Dinu, Ioan M. Duminica, Ioana Majeri, Gabriel C. |
| author_facet | Filip, Matei S. Alexa, Calin Costache, Daniel C. Dinu, Ioan M. Duminica, Ioana Majeri, Gabriel C. |
| contents | We study the HL-LHC sensitivity to an ultraheavy diquark $S_{uu}$ produced in up-quark fusion and decaying as $S_{uu}\to uχ$, $χ\to Wb, Zt, h^0t$. For fully hadronic decays of the W, Z and top quark, this gives rise to multijet final states. Within the same model framework used previously for the $S_{uu}\toχχ$ six-jet channel, we consider $S_{uu}$ masses in the multi-TeV range and vectorlike quark masses of order a few TeV, and simulate proton-proton collisions at $\sqrt s = 13.6$ TeV with integrated luminosities up to the HL-LHC target. The analysis strategy employs a machine-learning-based discriminant adapted from the six-jet study to the new four-jet topology, which we use to derive the corresponding discovery reaches and exclusion limits. We find that this topology improves the overall sensitivity to $S_{uu}$ in regions where the branching ratio $B(S_{uu}\to uχ)$ is sizable and provides a complementary signature for studying ultraheavy diquarks at the HL-LHC. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_11181 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | HL-LHC sensitivity to an ultraheavy $S_{uu}$ diquark in the $uχ$ channel Filip, Matei S. Alexa, Calin Costache, Daniel C. Dinu, Ioan M. Duminica, Ioana Majeri, Gabriel C. High Energy Physics - Phenomenology High Energy Physics - Experiment We study the HL-LHC sensitivity to an ultraheavy diquark $S_{uu}$ produced in up-quark fusion and decaying as $S_{uu}\to uχ$, $χ\to Wb, Zt, h^0t$. For fully hadronic decays of the W, Z and top quark, this gives rise to multijet final states. Within the same model framework used previously for the $S_{uu}\toχχ$ six-jet channel, we consider $S_{uu}$ masses in the multi-TeV range and vectorlike quark masses of order a few TeV, and simulate proton-proton collisions at $\sqrt s = 13.6$ TeV with integrated luminosities up to the HL-LHC target. The analysis strategy employs a machine-learning-based discriminant adapted from the six-jet study to the new four-jet topology, which we use to derive the corresponding discovery reaches and exclusion limits. We find that this topology improves the overall sensitivity to $S_{uu}$ in regions where the branching ratio $B(S_{uu}\to uχ)$ is sizable and provides a complementary signature for studying ultraheavy diquarks at the HL-LHC. |
| title | HL-LHC sensitivity to an ultraheavy $S_{uu}$ diquark in the $uχ$ channel |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2601.11181 |