Dijet acoplanarity as a function of flattenicity in proton-proton collisions at √s=13 TeV
Abstract
One of the most important discoveries at the LHC is the presence of effects associated with quark-gluon plasma (QGP) formation in proton-proton (pp) collisions. The origin of these observations remains unknown. Since event selection in many studies relies on multiplicity-based estimators known to introduce selection biases, alternative approaches must be explored to elucidate the origin of these phenomena. This contribution presents a comparison of different event classifiers used in LHC experiments, aiming to assess their mutual compatibility. Results for pp collisions at √s=13 TeV simulated with PYTHIA 8 indicate that the different classifiers introduce biases that can obscure any evidence of QGP formation in small systems. However, these biases are significantly reduced or absent in events triggered with flattenicity. This finding motivates the application of flattenicity in dijet acoplanarity studies used to search for jet quenching effects. While multiplicity-based estimators produce an azimuthal broadening in high-multiplicity compared with minimum-bias pp collisions, even in PYTHIA 8 that does not incorporate jet quenching, events triggered with flattenicity show no such broadening. This suggests that this novel tool could be exploited by LHC experiments to refine jet-quenching searches in small systems.
Related
- Search for resonant and nonresonant production of pairs of dijet resonances with b jets in the final state in proton-proton collisions at √s = 13 TeV
- Flattenicity dependence of charge and transverse-momentum balance functions in pp collisions at √s=13.6 TeV with PYTHIA8
- Transverse-spin dependent energy-energy correlators in proton-proton collisions within the dihadron fragmentation framework
- Search for low-mass resonances decaying to ττ in proton-proton collisions at √s = 13.6 TeV
- Search for the nonresonant production of a pair of additional Higgs bosons in the type-X two-Higgs-doublet model in proton-proton collisions at √s = 13 TeV
BibTeX
@misc{mendez2026dijet,
title = {{Dijet acoplanarity as a function of flattenicity in proton-proton collisions at $\sqrts=13$ TeV}},
author = {Jesus Eduardo Muñoz Mendez and Antonio Ortiz},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.04097},
eprint = {2610.04097},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.04097},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Dijet acoplanarity as a function of flattenicity in proton-proton collisions at √s=13 TeV
AU - Jesus Eduardo Muñoz Mendez
AU - Antonio Ortiz
PY - 2026
DA - 2026/10/02
PB - arXiv
DO - 10.48550/arxiv.2610.04097
UR - https://arxiv.org/abs/2610.04097
AB - One of the most important discoveries at the LHC is the presence of effects associated with quark-gluon plasma (QGP) formation in proton-proton (pp) collisions. The origin of these observations remains unknown. Since event selection in many studies relies on multiplicity-based estimators known to introduce selection biases, alternative approaches must be explored to elucidate the origin of these phenomena. This contribution presents a comparison of different event classifiers used in LHC experiments, aiming to assess their mutual compatibility. Results for pp collisions at √s=13 TeV simulated with PYTHIA 8 indicate that the different classifiers introduce biases that can obscure any evidence of QGP formation in small systems. However, these biases are significantly reduced or absent in events triggered with flattenicity. This finding motivates the application of flattenicity in dijet acoplanarity studies used to search for jet quenching effects. While multiplicity-based estimators produce an azimuthal broadening in high-multiplicity compared with minimum-bias pp collisions, even in PYTHIA 8 that does not incorporate jet quenching, events triggered with flattenicity show no such broadening. This suggests that this novel tool could be exploited by LHC experiments to refine jet-quenching searches in small systems.
ER -