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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:
Search for Top Squark Pair Production in the 2-Body All-Hadronic Decay Channel at the LHC
Authors:
Anca-Maria DINU (1,2), Călin ALEXA (2), Ioana DUMINICĂ (1,2), Matei S. FILIP (1,2)
*
Affiliation:
1)Faculty of Physics, University of Bucharest, Atomiștilor 405, RO-077125, Măgurele, Romania
2)IFIN-HH, Reactorului 30, RO-077125, P.O.B. MG-6, Măgurele, Romania
E-mail
anca-maria.dinu@s.unibuc.ro
Keywords:
supersymmetry, stop pair production, LHC, all-hadronic final state
Abstract:
Supersymmetry (SUSY), the symmetry relating bosonic and fermionic degrees of freedom, is one of the most robust and well-motivated extensions of the Standard Model (SM). It provides a solution to the Hierarchy Problem without the need for extreme fine-tuning, facilitates gauge coupling unification, and provides a viable dark matter candidate.
This presentation investigates top squark (stop) pair production within the Minimal Supersymmetric Standard Model (MSSM). The stop is a primary candidate for discovery at the Large Hadron Collider (LHC) because its mass is theoretically bounded by naturalness: it must cancel the large radiative corrections to the Higgs mass driven by the top quark. Specifically, this research examines the all-hadronic decay channel, where stops decay into top quarks and stable neutralinos, producing a signature of high jet multiplicity and significant missing transverse energy.
This channel is analyzed using both traditional Cut-Based Analysis and modern Machine Learning techniques. Signal events were simulated using MadGraph5_aMC@NLO, Pythia8, and Delphes, while SM backgrounds were sourced from the 2025 ATLAS Open Data release for proton–proton collisions at a center-of-mass energy of 13 TeV. The aim of this presentation is to highlight the critical role of advanced computational tools in probing the remaining SUSY parameter space while emphasizing the necessity for refined theoretical models and expanded experimental reach.
References:
[1] I. J. R. Aitchison. Supersymmetry in Particle Physics. An Elementary Introduction.
Cambridge University Press, Cambridge, 2007
[2] ATLAS Collaboration. Search for a scalar partner of the top quark in the all-hadronic
t¯t plus missing transverse momentum final state at √s = 13 TeV with the ATLAS
detector. The European Physical Journal C, 80(8), August 2020
[3] The ATLAS Collaboration. Search for a scalar partner of the top quark in the jets
plus missing transverse momentum final state at √s = 13 TeV with the ATLAS
detector. Journal of High Energy Physics, 2017(85), 2017
[4] ATLAS Collaboration. ROOT ntuple format 2015–2016 proton-proton Open Data
for Education and Outreach beta release from the ATLAS experiment, 2025
[5] Byron P. Roe et al. Boosted decision trees as an alternative to artificial neural
networks for particle identifications. Nuclear Instruments and Methods in Physics
Research A, 543:577–584, 2005
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