Jet properties in low and high multiplicity events in p-p collisions at 7 TeV
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Abstract:
The characteristics of multi-particle production in p-p collisions at TeV are studied as a function of the event charged particle multiplicity (), by classifying the measured tracks into two distinct classes, those belonging to jets and those belonging to the underlying event (UE). Charged tracks are measured within pseudorapidity 2.4 and transverse momenta above ~=~0.25~GeV/c, and charged-particle jets are reconstructed above ~=~5~GeV/c with track-only information. The distributions of jet , average of UE tracks and jets, jet rates, and jet shapes are studied as a function of and are compared to the predictions of the \textsc{pythia} and \textsc{herwig} Monte Carlo (MC) event generators. As the event-multiplicity increases, \textsc{pythia} systematically predicts higher jet rates and harder spectra than seen in the data, whereas \textsc{herwig} shows the opposite trend. Predictions without multi-parton interactions fail completely to describe the data. In the lowest-multiplicity events, the data show narrower jets than predicted by both MC generators.Note:
- CMS Physics Analysis Summary - preliminary results
- Data
- p p: scattering
- jet: multiplicity
- hadron: multiple production
- charged particle: multiplicity
- multiplicity: dependence
- track data analysis: jet
- shape analysis: jet
- Monte Carlo
- HERWIG
References(34)
Figures(0)
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