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Measurement of charged jet suppression in Pb-Pb collisions at √sNN=2.76 TeV

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A measurement of the transverse momentum spectra of jets in Pb-Pb collisions at $ \sqrt{{{s_{\mathrm{NN}}}}} $= 2.76TeV is reported. Jets are reconstructed from charged particles using the anti-kT jet algorithm with jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |η| < 0.5. The tran...

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Main Authors: Abelev, Betty (Author) , Angelov, Venelin (Author) , Busch, Oliver (Author) , Glässel, Peter (Author) , Grajcarek, Robert (Author) , Klein, Jochen (Author) , Lohner, Daniel (Author) , Lu, Xianguo (Author) , Maire, Antonin (Author) , Mercado Pérez, Jorge (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Stachel, Johanna (Author) , Stiller, Johannes Hendrik (Author) , Vallero, Sara (Author) , Völkl, Martin (Author) , Wilkinson, Jeremy (Author) , Windelband, Bernd (Author) , Winn, Michael (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 03 March 2014
In: Journal of high energy physics

ISSN:1029-8479
DOI:10.1007/JHEP03(2014)013
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP03(2014)013
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Author Notes:the ALICE collaboration
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Summary:A measurement of the transverse momentum spectra of jets in Pb-Pb collisions at $ \sqrt{{{s_{\mathrm{NN}}}}} $= 2.76TeV is reported. Jets are reconstructed from charged particles using the anti-kT jet algorithm with jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |η| < 0.5. The transverse momentum pT of charged particles is measured down to 0.15 GeV/c which gives access to the low pT fragments of the jet. Jets found in heavy-ion collisions are corrected event-by-event for average background density and on an inclusive basis (via unfolding) for residual background fluctuations and detector effects. A strong suppression of jet production in central events with respect to peripheral events is observed. The suppression is found to be similar to the suppression of charged hadrons, which suggests that substantial energy is radiated at angles larger than the jet resolution parameter R = 0.3 considered in the analysis. The fragmentation bias introduced by selecting jets with a high pT leading particle, which rejects jets with a soft fragmentation pattern, has a similar effect on the jet yield for central and peripheral events. The ratio of jet spectra with R = 0.2 and R = 0.3 is found to be similar in Pb-Pb and simulated PYTHIA pp events, indicating no strong broadening of the radial jet structure in the reconstructed jets with R < 0.3.
Item Description:The ALICE collaboration: B. Abelev, V. Angelov, O. Busch, P. Glässel, R. Grajcarek, J. Klein, D. Lohner, X. Lu, A. Maire, J. Mercado Pérez, K. Oyama, Y.C. Pachmayer, J. Stachel, J.H. Stiller, S. Vallero, M. Völkl, J. Wilkinson, B. Windeband, M. Winn [und viele weitere]
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt
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Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP03(2014)013

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