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Measurement of Event Background Fluctuations for Charged Particle Jet Reconstruction in Pb-Pb collisions at $\sqrt(s_(NN)) = 2.76$ TeV
Abelev B., Arbor N., Conesa Balbastre G., Faivre J., Furget C. et al
Journal of High Energy Physics 1203 (2012) (2012) 053 - http://hal.in2p3.fr/in2p3-00659804
Physique/Physique des Hautes Energies - Expérience
Measurement of Event Background Fluctuations for Charged Particle Jet Reconstruction in Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV
B. Abelev, N. Arbor1, G. Conesa Balbastre1, J. Faivre1, C. Furget1, R. Guernane1, S. Kox1, Y. Mao1, J.S. Real1, R. Vernet2, L. Aphecetche3, Guillaume Batigne ()3, M. Bregant3, H. Delagrange3, O. Driga3, M. Estienne3, M. Germain3, A. Lardeux3, F. Lefèvre3, M. Lenhardt3, L. Luquin3, G. Martınez Garcıa3, A. Mas3, A. Matyja3, P. Pillot3, Y. Schutz3, A. Shabetai3, D. Stocco3, I. Belikov4, J.P. Coffin4, Z. Conesa Del Valle4, B. Hippolyte4, S. Jangal4, C. Kuhn4, A. Maire4, A. Michalon4, C. Roy4, X. Sanchez Castro4, S. Senyukov4, R. Wan4, Sang Un Ahn5, Y.W. Baek5, A. Baldit5, V. Barret5, N. Bastid5, P. Crochet5, P. Dupieux5, I. Ichou5, X. Lopez5, F. Manso5, M. Marchisone5, S. Porteboeuf-Houssais5, P. Rosnet5, B. Vulpescu5, X. Zhang5, A. Baldisseri6, H. Borel6, J. Castillo Castellanos6, J.L. Charvet6, G. Geuna6, S. Pal6, A. Rakotozafindrabe6, H. Yang6, B. Boyer7, I. Das7, B. Espagnon7, C. Hadjidakis7, I. Hrvnacova7, I. Lajomov7, Y. Le Bornec7, C. Suire7, J.D. Tapia Takaki7, L. Valencia Palomo7, c. Cheshkov8, B. Cheynis8, L. Ducroux8, J.-Y. Grossiord8, M. Guilbaud8, L. Massacrier8, R. Tieulent8, A. Uras8
1 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
http://lpsc.in2p3.fr
CNRS : UMR5821 – IN2P3 – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
53 avenue des Martyrs - 38026 Grenoble Cedex
France
2 :  CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules
http://cc.in2p3.fr/
CNRS : USR6402 – IN2P3
12-14, boulevard Niels Bohr 69622 VILLEURBANNE CEDEX
France
3 :  SUBATECH - Laboratoire SUBATECH Nantes
http://www-subatech.in2p3.fr/
CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes
4, rue Alfred Kastler - 44070 Nantes Cedex 03
France
4 :  IPHC - Institut Pluridisciplinaire Hubert Curien
CNRS : UMR7178 – Université Louis Pasteur - Strasbourg I
France
5 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
http://clrwww.in2p3.fr/
CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II
Campus des Cézeaux 24, avenue des Landais BP 80026 63171 Aubière Cedex
France
6 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
CEA : DSM/IRFU
France
7 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
8 :  IPNL - Institut de Physique Nucléaire de Lyon
http://www.ipnl.in2p3.fr/
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
France
Laboratoire de Physique Corpusculaire
Alice
The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV has been measured with the ALICE experiment. The main sources of non-statistical fluctuations are characterized based purely on experimental data with an unbiased method, as well as by using single high p_t particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-kt jet finder. The influence of a low transverse momentum cut-off on particles used in the jet reconstruction is quantified by varying the minimum track p_t between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with p_t > 0.15 GeV/c, the uncertainty in the reconstructed jet transverse momentum due to the heavy-ion background is measured to be 11.3 GeV/c (standard deviation) for the 10% most central Pb-Pb collisions, slightly larger than the value of 11.0 GeV/c measured using the unbiased method. For a higher particle transverse momentum threshold of 2 GeV/c, which will generate a stronger bias towards hard fragmentation in the jet finding process, the standard deviation of the fluctuations in the reconstructed jet transverse momentum is reduced to 4.8-5.0 GeV/c for the 10% most central events. A non-Gaussian tail of the momentum uncertainty is observed and its impact on the reconstructed jet spectrum is evaluated for varying particle momentum thresholds, by folding the measured fluctuations with steeply falling spectra.
ALICE

Articles dans des revues avec comité de lecture
2012
Journal of High Energy Physics
Publisher Institute of Physics (IOP)
ISSN 1126-6708 (eISSN : 1029-8479)
1203 (2012)
053

LPSC12014
See paper for full list of authors - 22 Pages, 5 Figures, submitted to JHEP
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1201.2423