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Transverse sphericity of primary charged particles in minimum bias proton-proton collisions at √s=0.9, 2.76 and 7 TeV

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Measurements of the sphericity of primary charged particles in minimum bias proton-proton collisions at s√=0.9, 2.76 and 7 TeVs=0.9, 2.76 and 7 TeV\sqrt{s}=0.9,~2.76\mbox{ and }7~\mathrm{TeV} with the ALICE detector at the LHC are presented. The observable is measured in the plane perpendicular to t...

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Main Authors: Abelev, Betty (Author) , Busch, Oliver (Author) , Engel, Heiko (Author) , Glässel, Peter (Author) , Grajcarek, Robert (Author) , Herrmann, Norbert (Author) , Krawutschke, Tobias (Author) , Kweon, MinJung (Author) , Lara Martinez, Camilo Ernesto (Author) , Lohner, Daniel (Author) , Mercado Pérez, Jorge (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schweda, Kai (Author) , Stachel, Johanna (Author) , Ulrich, Joachim (Author) , Vallero, Sara (Author) , Wiechula, Jens (Author) , Windelband, Bernd (Author) , Zelnicek, Pierre (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 18 September 2012
In: The European physical journal. C, Particles and fields
Year: 2012, Volume: 72, Issue: 9
ISSN:1434-6052
DOI:10.1140/epjc/s10052-012-2124-9
Online Access:Verlag, Volltext: http://dx.doi.org/10.1140/epjc/s10052-012-2124-9
Verlag, Volltext: https://doi.org/10.1140/epjc/s10052-012-2124-9
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Author Notes:the ALICE Collaboration
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Summary:Measurements of the sphericity of primary charged particles in minimum bias proton-proton collisions at s√=0.9, 2.76 and 7 TeVs=0.9, 2.76 and 7 TeV\sqrt{s}=0.9,~2.76\mbox{ and }7~\mathrm{TeV} with the ALICE detector at the LHC are presented. The observable is measured in the plane perpendicular to the beam direction using primary charged tracks with p T>0.5 GeV/c in |η|<0.8. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity (N ch) is reported for events with different p T scales (“soft” and “hard”) defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found to grow with multiplicity at all collision energies, with a steeper rise at low N ch, whereas the event generators show an opposite tendency. The combined study of the sphericity and the mean p T with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in decreased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators.
Item Description:The ALICE Collaboration: B. Abelev, O. Busch, H. Engel, P. Glässel, R. Grajcarek, N. Herrmann, T. Krawutschke, M.J. Kweon, C. Lara, D. Lohner, J. Mercado Pérez, K. Oyama, Y. Pachmayer, K. Reygers, R. Schicker, K. Schweda, J. Stachel, J. Ulrich, S. Vallero, J. Wiechula, B. Windelband, P. Zelnicek, A. Zimmermann [und weitere]
Gesehen am 30.11.2018
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-012-2124-9

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