Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-SMP-23-008 | ||
| Measurement of event shapes in minimum bias events from pp collisions at 13 TeV | ||
| CMS Collaboration | ||
| 4 June 2024 | ||
| Abstract: This note presents a measurement of event-shape variables using a data sample of low-pileup inelastic proton-proton collisions collected by the CMS detector at a centre-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 is corrected for detector effects and compared to simulations. Inclusive event-shape distributions, as well as event shapes as a function of charged-particle multiplicity, are studied. None of the models investigated, including EPOS, one HERWIG7 tune, and several PYTHIA8 tunes, are able to satisfactorily describe the data. Moreover, there are significant trends in this misdescription that are 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. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRD. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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