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Title: Measurement of the underlying event activity at the LHC with ?s = 7 TeV and comparison with ?s = 0:9 TeV
Authors: CMS Collaboration
Demir, Durmuş Ali
Keywords: Hadron-hadron scattering
Compact Muon Solenoid
Large Hadron Collider (LHC)
CMS detectors
High energy physics
Publisher: Springer Verlag
Source: Chatrchyan, S, Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M.,...CMS Collaboration (2011). Measurement of the underlying event activity at the LHC with √s = 7 TeV and comparison with √s = 0:9 TeV. Journal of High Energy Physics, 2011. doi:10.1007/JHEP09(2011)109
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.
ISSN: 1029-8479
Appears in Collections:Physics / Fizik
Rectorate / Rektörlük
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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