Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-59457
CMS Collaboration, including the following authors; Amsler, C; Chiochia, V; Snoek, H; Favaro, C; Verzetti, M; Schmitt, A; De Visscher, S; Otyugova, P; Millan, B; Aguiló, E; Ivova, M; Storey, J (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, (9):109.
A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |eta| < 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 track-jet, 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 centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.
|Other titles:||Measurement of the underlying event activity at the LHC with sqrt(s)= 7 TeV and comparison with sqrt(s) = 0.9 TeV|
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Physics Institute|
|Deposited On:||17 Feb 2012 16:18|
|Last Modified:||16 May 2013 06:43|
|ISSN:||1126-6708 (P) 1029-8479 (E)|
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