Measurement of the primary Lund jet plane density in proton-proton collisions at √ s = 13 TeV ; Measurement of the primary Lund jet plane density in proton-proton collisions at $\sqrt{s}$ = 13 TeV

A preprint version of the article is available at arXiv:2312.16343v1 [hep-ex], https://arxiv.org/abs/2312.16343v1 [it will be replaced with v2 in due course). Comments: Submitted to the Journal of High Energy Physics. All figures and tables can be found at https://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-22-007 (CMS Public Pages). Report number: CMS-SMP-22-007, CERN-EP-2023-282. ; A measurement is presented of the primary Lund jet plane (LJP) density in inclusive jet production in proton-proton collisions. The analysis uses 138 fb−1 of data collected by the CMS experiment at √s = 13 TeV. The LJP, a representation of the phase space of emissions inside jets, is constructed using iterative jet declustering. The transverse momentum kT and the splitting angle ΔR of an emission relative to its emitter are measured at each step of the jet declustering process. The average density of emissions as function of ln(kT/GeV) and ln(R/ΔR) is measured for jets with distance parameters R = 0.4 or 0.8, transverse momentum pT> 700 GeV, and rapidity |y|< 1.7. The jet substructure is measured using the charged-particle tracks of the jet. The measured distributions, unfolded to the level of stable particles, are compared with theoretical predictions from simulations and with perturbative quantum chromodynamics calculations. Due to the ability of the LJP to factorize physical effects, these measurements can be used to improve different aspects of the physics modeling in event generators. ; SCOAP3.