New Observables for Resonant and Non-Resonant New Physics Searches at Colliders
Abstract
The discovery of the Higgs boson cemented the Standard Model of particle physics (SM) as we know it and observations have so far confirmed SM predictions. Now, too many beyond-the-Standard-Model (BSM) models can be explored to overcome the remaining shortcomings of the SM. As a result, generic models present a useful intermediary step to point towards the next extension of the SM probing multiple Ultraviolet models simultaneously. In this work, two examples are investigated. First, off-shell effects of potential heavy new particles are provided in the Standard Model Effective Field Theory (SMEFT) through higher dimensional operators. In particular, Charge-parity (CP) symmetry violating contributions from Wilson coefficients are ranked by using U(1) global flavour symmetries on CP-odd operators of the Warsaw basis. Asymmetries of simple triple products are proven to be more sensitive than the cross-section to these SMEFT operators and more efficient than most of the usual observables used in experiments. Then, on-shell effects of singlet and octet scalars of SUC(3) are independently searched for in four-top production. The signal consists of the associated production of a scalar with a top quark pair and of pair production in the case of the octet producing boosted top-quark pairs. The processes are generated at next-to-leading order in quantum chromodynamics with a careful renormalisation procedure and the correct selection of loop diagrams. Using improvements in top-jet tagging techniques and in the main background simulation as well as a new technique to select the events, a new particle search is performed to constrain the respective mass and coupling to top quarks of new resonances.
Related
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- Axion-Like Particle Searches at Muon Colliders: Photon-Neutrino Signatures and Heavy-Neutral-Lepton Feasibility
- Resonant Di-Higgs Searches in bb̅τ+τ- at HL-LHC: Supersymmetry versus Compositeness Benchmarks
- Time-Domain Observables for Resonant Scattering in Quantum Simulations of Lattice Gauge Theory
BibTeX
@misc{toucheque2026observables,
title = {{New Observables for Resonant and Non-Resonant New Physics Searches at Colliders}},
author = {Julien Touchèque},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.39381},
eprint = {2609.39381},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.39381},
}
RIS
TY - UNPB
TI - New Observables for Resonant and Non-Resonant New Physics Searches at Colliders
AU - Julien Touchèque
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2609.39381
UR - https://arxiv.org/abs/2609.39381
AB - The discovery of the Higgs boson cemented the Standard Model of particle physics (SM) as we know it and observations have so far confirmed SM predictions. Now, too many beyond-the-Standard-Model (BSM) models can be explored to overcome the remaining shortcomings of the SM. As a result, generic models present a useful intermediary step to point towards the next extension of the SM probing multiple Ultraviolet models simultaneously. In this work, two examples are investigated. First, off-shell effects of potential heavy new particles are provided in the Standard Model Effective Field Theory (SMEFT) through higher dimensional operators. In particular, Charge-parity (CP) symmetry violating contributions from Wilson coefficients are ranked by using U(1) global flavour symmetries on CP-odd operators of the Warsaw basis. Asymmetries of simple triple products are proven to be more sensitive than the cross-section to these SMEFT operators and more efficient than most of the usual observables used in experiments. Then, on-shell effects of singlet and octet scalars of SUC(3) are independently searched for in four-top production. The signal consists of the associated production of a scalar with a top quark pair and of pair production in the case of the octet producing boosted top-quark pairs. The processes are generated at next-to-leading order in quantum chromodynamics with a careful renormalisation procedure and the correct selection of loop diagrams. Using improvements in top-jet tagging techniques and in the main background simulation as well as a new technique to select the events, a new particle search is performed to constrain the respective mass and coupling to top quarks of new resonances.
ER -