A version of the article is available at arXiv:2505.17850v2 [hep-ex] (https://arxiv.org/abs/2505.17850). Comments: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at https://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-23-008 (CMS Public Pages). Subjects: High Energy Physics - Experiment (hep-ex). Report number: CMS-SMP-23-008, CERN-EP-2025-041. Journal reference: Phys. Rev. D 112 (2025) 112006. Related DOI: https://doi.org/10.1103/rqvb-gfb7 . From: The CMS Collaboration: [v1] Fri, 23 May 2025 13:03:03 UTC (664 KB); [v2] Sat, 13 Dec 2025 17:48:49 UTC (701 KB).Data Availability:
Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by the CMS data preservation, reuse, and open access policy [80]. CMS data availability statement [https://opendata.cern.ch/record/415].A measurement of event-shape variables is presented, using a data sample produced in a special run with approximately one inelastic proton-proton collision per bunch crossing. The data were collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 64μb⁻¹. A number of observables related to the overall distribution of charged particles in the collisions are corrected for detector effects and compared with simulations. Inclusive event-shape distributions, as well as differential distributions of event shapes as functions of charged-particle multiplicity, are studied. None of the models investigated are able to satisfactorily describe the data. Moreover, there are significant features common amongst all generator setups studied, particularly showing data being more isotropic than any of the simulations. Multidimensional unfolded distributions are provided, along with their correlations.SCOAP³
