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Title

Measurement of the underlying event activity at the LHC with ps = 7 TeV and comparison with ps = 0:9 TeV

AuthorsChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Chuang, S. H. ; Duarte Campderros, J. ; Felcini, Marta ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Lobelle Pardo, P. ; López Virto, A. ; Marco, Rafael ; Marco, Jesús ; Martínez-Rivero, Celso ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Sobron Sañudo, M. ; Vilar, Rocío ; Vila, Iván ; CMS Collaboration
KeywordsHadron-Hadron Scattering
Issue Date2011
PublisherSpringer
CitationJournal of High Energy Physics 9: 109 (2011)
AbstractA 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 at ps = 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 p T  > 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-p T sum of the particles in the transverse region is observed with increasing p T of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet p T 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.
Description31 páginas, 6 figuras, 1 tabla.-- Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License
Publisher version (URL)http://dx.doi.org/10.1007/JHEP09(2011)109
URIhttp://hdl.handle.net/10261/52001
DOI10.1007/JHEP09(2011)109
E-ISSN1029-8479
Appears in Collections:(IFCA) Artículos
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