@misc{10481/106674,
year = {2025},
month = {7},
url = {https://hdl.handle.net/10481/106674},
abstract = {We propose a new strategy to obtain a high-purity sample of gluon-initiated
jets at the LHC. Our approach, inspired by the Lund jet plane picture, is to perform a dijet
selection where the two jets are collinear to each other and their momentum fraction share
is highly asymmetric, and to measure the primary Lund plane density of emissions of the
subleading jet. The subleading jet in this topology is practically equivalent to a secondary
Lund jet plane. We demonstrate by means of fxed-order calculations that such a simple
setup yields (Born-level) gluon jet fractions of around 90% for the subleading jet for both
quark- and gluon-initiated jets. This observation is confrmed using hadron-level Monte Carlo
generated events. We also show that the extracted gluon purities are highly resilient to the
overall colour structure of the event, to the favour of the hard-scattering process, and to
the parton distribution functions. This strategy is well-suited for constraining the radiation
pattern of gluon-initiated jets using a set of fducial cuts that can readily be tested at the
LHC, without relying on taggers or statistical demixing.},
organization = {European Research Council (ERC), Horizon 2020 (788223 — PanScales)},
organization = {ERC Consolidator Programme (1010022070 - QCDHighdensityCMS)},
organization = {Ramón y Cajal Program (RYC2022-037846-I)},
organization = {U.S. Department of Energy, Office of Science, Office of Nuclear Physics (DE-SC0011088)},
publisher = {Springer},
keywords = {Jets and Jet Substructure},
keywords = {Parton Shower},
title = {Secondary Lund jet plane as a gluon-enriched sample},
doi = {10.1007/jhep07(2025)088},
author = {Baldenegro, Cristian and Soto-Ontoso, Alba and Soyez, Gregory},
}