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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2026-06-11 23:58 |
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Conference: Bucharest University Faculty of Physics 2026 Meeting
Section: High-Energy Physics
Title:
Overview of the resonant production of ultraheavy scalars at the HL-LHC
Authors:
Ioana DUMINICA (1,2), Calin ALEXA (2), Daniel C. COSTACHE (1,2), Anca M. DINU (1,2), Ioan-Mihail DINU (2), Matei-Stefan FILIP (1,2), Gabriel C. MAJERI (1)
*
Affiliation:
1) Faculty of Physics, University of Bucharest
2) DFPE, IFIN-HH
E-mail
ioana.duminica@cern.ch
Keywords:
phenomenology, diquark scalar, vectorlike quarks, fully hadronic, HL-LHC
Abstract:
Ultra-high phase spaces might be accessed through the 13.6 TeV collision energy in Run3 data taking period, as well as the high luminosity upgrades of the Large Hadron Collider. This is an opportunity to explore the observation insights and/or limitations of the HL-LHC experiments to potentially new physics. We performed phenomenological feasibility studies of resonantly produced diquark scalar at the HL-LHC experiments. Starting from the Monte Carlo generation of signal and background processes, we apply a Random Forest multi-dimensional discriminator and perform a thorough statistical interpretation of the event selection efficiency. We explore the multi-jet fully hadronic final states of a diquark decaying into a pair of vectorlike quarks, as well as a SM up quark and a BSM VLQ pair. Our results show that, regardless of the diquark decay mode, the high luminosity ATLAS experiment might find or set boundaries of an ultraheavy scalar mass in the 8-9 TeV range.
References:
[1] Ioana Duminica, Calin Alexa, Ioan M. Dinu, Bogdan A. Dobrescu, Matei-Stefan Filip, Ultraheavy diquark decaying into vectorlike quarks at the LHC, (2025) Phys. Rev. D 111, 11, 115025.
[2] Daniel C. Costache, Calin Alexa, Anca M. Dinu, Ioan M. Dinu, Ioana Duminica, Matei S. Filip, Gabriel C. Majeri, Observability of an ultraheavy diquark decaying into vectorlike quarks at the LHC, (2025) arXiv:2511.02474 [hep-ph], accepted at Phys. Rev. D.
[3] Matei S. Filip, Calin Alexa, Daniel C. Costache, Anca M. Dinu, Ioan M. Dinu, Ioana Duminica, Gabriel C. Majeri, HL-LHC sensitivity to an ultraheavy $S_{uu}$ diquark in the $u chi$ channel, (2026) arXiv:2601.11181 [hep-ph], sent for publication at Phys. Rev. D.
[4] Bogdan A. Dobrescu, Robert M. Harris, Joshua Isaacson, Ultraheavy resonances at the LHC: beyond the QCD background, (2018) arXiv:1810.09429v1 [hep-ph].
[5] The CMS Collaboration, Search for resonant and nonresonant production of pairs of dijet resonances in proton-proton collisions at s=13 TeV, (2022) arXiv:2206.09997v1 [hep-ex].
[6] Bogdan A. Dobrescu, TeV-scale particles and LHC events with dijet pairs, (2024) arXiv:2411.04121v1 [hep-ph].
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