Measurement of the underlying event activity at the LHC with √s = 7 TeV and comparison with √s = 0.9 TeV

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)109Open Access

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 = 0.9s=09 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
Source:Copyright of this article belongs to Institute of Physics.
Keywords:Hadron-Hadron Scattering
ID Code:92371
Deposited On:30 May 2012 09:14
Last Modified:22 Nov 2019 05:37

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