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Underlying event measurements in pp collisions at √s=0.9 and 7 TeV with the ALICE experiment at the LHC

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We present measurements of Underlying Event observables in pp collisions at s√=0.9s=0.9 \sqrt {s} = 0.9 and 7TeV. The analysis is performed as a function of the highest charged-particle transverse momentum p T,LT in the event. Different regions are defined with respect to the azimuthal direction of...

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Main Authors: Abelev, Betty (Author) , Angelov, Venelin (Author) , Busch, Oliver (Author) , Glässel, Peter (Author) , Grajcarek, Robert (Author) , Herrmann, Norbert (Author) , Krawutschke, Tobias (Author) , Kweon, MinJung (Author) , Lohner, Daniel (Author) , Lu, Xianguo (Author) , Mercado Pérez, Jorge (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Radomski, Sylwester (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schweda, Kai (Author) , Stachel, Johanna (Author) , Ulrich, Joachim (Author) , Vallero, Sara (Author) , Wang, Yifei (Author) , Wiechula, Jens (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: July 18, 2012
In: Journal of high energy physics
Year: 2012, Issue: 7
ISSN:1029-8479
DOI:10.1007/JHEP07(2012)116
Online Access:Verlag, Volltext: http://dx.doi.org/10.1007/JHEP07(2012)116
Verlag, Volltext: https://doi.org/10.1007/JHEP07(2012)116
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Author Notes:the ALICE Collaboration
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Summary:We present measurements of Underlying Event observables in pp collisions at s√=0.9s=0.9 \sqrt {s} = 0.9 and 7TeV. The analysis is performed as a function of the highest charged-particle transverse momentum p T,LT in the event. Different regions are defined with respect to the azimuthal direction of the leading (highest transverse momentum) track: Toward, Transverse and Away. The Toward and Away regions collect the fragmentation products of the hardest partonic interaction. The Transverse region is expected to be most sensitive to the Underlying Event activity. The study is performed with charged particles above three different p T thresholds: 0.15, 0.5 and 1.0 GeV/c. In the Transverse region we observe an increase in the multiplicity of a factor 2-3 between the lower and higher collision energies, depending on the track p T threshold considered. Data are compared to Pythia 6.4, Pythia 8.1 and Phojet. On average, all models considered underestimate the multiplicity and summed p T in the Transverse region by about 10-30%.
Item Description:Gesehen am 15.11.2018
The ALICE Collaboration: Betty Abelev, Venelin Anguelov, Oliver Busch, Peter Glassel, Robert Grajcarek, Norbert Herrmann, Tobias Krawutschke, Min Jung Kweon, Daniel Lohner, Xianguo Lu, Jorge Mercado Perez, Ken Oyama, Yvonne Chiara Pachmayer, Sylwester Radomski, Klaus Johannes Reygers, Rainer Martin Schicker, Kai Oliver Schweda, Johanna Stachel, Jochen Ulrich, Sara Vallero, Yifei Wang, Jens Wiechula, Alice Zimmermann [und weitere]
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP07(2012)116

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