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Measurement of charged jet suppression n Pb-Pb collisions at sqrt(sNN)=2.76TeV

B. Abelev Laurent Aphecetche 1 Y.W. Baek 2 V. Barret 2 N. Bastid 2 Guillaume Batigne 1 A.A.E. Bergognon 1 M. Bregant 1 C. Cheshkov 3 B. Cheynis 3 P. Crochet 2 H. Delagrange 1 L. Ducroux 3 P. Dupieux 2 B. Erazmus 1 Magali Estienne 1 Marie Germain 1 J.-Y. Grossiord 3 M. Guilbaud 3 B. Hippolyte 4 J.-C. Ianigro 3 C. Kuhn 4 A. Lardeux 1 S. Li 2 X. Lopez 2 A. Maire 4 F. Manso 2 M. Marchisone 2 Gines Martinez Garcia 1 J. Martin Blanco 1 A. Mas 1 L. Massacrier 1 L. Molnar 4 A. Morreale 1 Philippe Pillot 1 S. Porteboeuf-Houssais 2 L. Ronflette 1 P. Rosnet 2 C. Roy 1 X. Sanchez Castro 4 Y. Schutz 1 Alexandre Shabetai 1 Diego Stocco 1 R. Tieulent 3 A. Uras 3 L. Valencia Palomo 2 R. Vernet 5 B. Vulpescu 2 M. Wang 1 X. Zhang 2 Y. Zoccarato 3 N. Arbor 6 G. Conesa Balbastre 6 J. Faivre 6 C. Furget 6 R. Guernane 6 S. Kox 6 J.S. Real 6 C. Silvestre 6 Z. Conesa Del Valle 7 I. Das 7 B. Espagnon 7 C. Hadjidakis 7 I. Lakomov 7 C. Suire 7 J. D. Tapia Takaki 7 L. Valencia Palomo 7 Alberto Baldisseri 8 Herve Borel 8 Javier Castillo 9, 8 Jean-Luc Charvet 8 Hugo Pereira da Costa 8 A Rakotozafindrabe 9, 8
Abstract : A measurement of the transverse momentum spectra of jets in Pb-Pb collisions at sqrt(sNN)=2.76TeV is reported. Jets are reconstructed from charged particles using the anti-k_T jet algorithm with jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |eta|<0.5. The transverse momentum p_T of charged particles is measured down to 0.15 GeV/c which gives access to the low p_T 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 p_T 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.
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Submitted on : Tuesday, November 5, 2013 - 7:42:38 AM
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B. Abelev, Laurent Aphecetche, Y.W. Baek, V. Barret, N. Bastid, et al.. Measurement of charged jet suppression n Pb-Pb collisions at sqrt(sNN)=2.76TeV. Journal of High Energy Physics, Springer, 2014, 3, pp.013. ⟨10.1007/JHEP03(2014)013⟩. ⟨in2p3-00879847⟩

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