Measurement of event shapes in minimum-bias events from proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

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 64 $\mu$b${}^{-1}$. 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 is 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.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-23-008 (CMS Public Pages)

References in corpus (21)

• An Introduction to PYTHIA 8.2
• Herwig++ Physics and Manual
• Particle-flow reconstruction and global event description with the CMS detector
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• The CMS trigger system
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
• Precision luminosity measurement in proton-proton collisions at $\sqrt{s}=$ 13 TeV in 2015 and 2016 at CMS
• OmniFold: A Method to Simultaneously Unfold All Observables
• The HepMC3 Event Record Library for Monte Carlo Event Generators
• Core-corona procedure and microcanonical hadronization to understand strangeness enhancement in proton-proton and heavy ion collisions in the EPOS4 framework
• Development and validation of HERWIG 7 tunes from CMS underlying-event measurements
• Multiplicity dependence of charged-particle production in pp, p-Pb, Xe-Xe and Pb-Pb collisions at the LHC
• Long- and short-range correlations and their event-scale dependence in high-multiplicity pp collisions at $\sqrt{\text{s}}=13$ TeV
• CMS PYTHIA 8 colour reconnection tunes based on underlying-event data
• Large Effects from Small QCD Instantons: Making Soft Bombs at Hadron Colliders
• How to discover QCD Instantons at the LHC
• Measurements of multijet event isotropies using optimal transport with the ATLAS detector
• Transmission of xenon scintillation light through PTFE
• Searches for QCD instantons with forward proton tagging
• Studying strangeness and baryon production mechanisms through angular correlations between charged $\Xi$ baryons and identified hadrons in pp collisions at $\sqrt{s}$ = 13 TeV