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Measurement of the underlying event activity at the LHC with √ s = 7 TeV and comparison with √ s = 0.9 TeV
Name
Chatrchyan2011_Article_MeasurementOfTheUnderlyingEven.pdf
Description
Published version
Size
605.98 KB
Format
Adobe PDF
Checksum (MD5)
d8c4e1d6abe071fc7a49700c98755a29
Date Issued
2011
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
Chatrchyan, S., et al. "Measurement of the Underlying Event Activity at the Lhc with Root S=7 Tev and Comparison with Root S=0.9 Tev." Journal of High Energy Physics 9 (2011).
Version
Final published version
Abstract
A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at √ s = 0:9 and 7TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η|<2 and transverse momentum pT >0:5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading trackjet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centreof- mass energy increase from 0:9 to 7TeV. Predictions of several QCD-inspired models as implemented in pythia are compared to the data.
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
10.1007/JHEP09(2011)109
