Gurtu, A. (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 (9). 109_1-109_28. ISSN 1126-6708
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Official URL: http://www.springerlink.com/content/w23340l25l8062...
Related URL: http://dx.doi.org/10.1007/JHEP09(2011)109
Abstract
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 √s = 0.9 and 7 TeV, 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 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.
Item Type: | Article |
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Source: | Copyright of this article belongs to Institute of Physics. |
ID Code: | 92354 |
Deposited On: | 30 May 2012 09:19 |
Last Modified: | 15 Oct 2019 09:30 |
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