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Measurements of underlying-event properties using neutral and charged particles in pp collisions at sqrt(s)= 900 GeV and sqrt(s)=7 TeV with the ATLAS detector at the LHC

By S. Albrand, M.L. Andrieux, B. Clement, J. Collot, S. Crépé-Renaudin, P. De Saintignon, P.A. Delsart, J. Donini, D. Dzahini, J.Y. Hostachy, E. Laisne, F. Ledroit-Guillon, A. Lleres, A. Lucotte, F. Malek, P. Martin, F. Polci, J. Stark, X. Sun, B. Trocmé, H. Bachacou, F. Bauer, N. Besson, M. Boonekamp, L. Chevalier, F. Chevallier, J. Ernwein, A.I. Etienvre, A. Formica, L. Gauthier, P.F. Giraud, C. Guyot, S. Hassani, W. Kozanecki, E. Lancon, J.F. Laporte, E. Le Menedeu, M. Legendre, B. Lenzi, B. Mansoulie, J.-P. Meyer, N. Morange, R. Nicolaidou, A. Ouraou, D.M. Pomarede, B. Resende, C.R. Royon, Ph. Schune, J. Schwindling, O. Simard, M. Virchaux, C. Biscarat, E. Cogneras, G. Rahal, Emmanuel Busato, D. Calvet, S. Calvet, Reina Coromoto Camacho Toro, Diane Cinca, R. Febbraro, N. Ghodbane, P.L.Y. Gris, C. Guicheney, D. Pallin, F. Podlyski, C. Santoni, L. P. Says, F. Vazeille, S. Viret, T. Beau, S. Bordoni, G. Calderini, A. Camard, P. Cavalleri, E. Chareyre, S. De Cecco, F. Derue, D. Imbault, M.W. Krasny, D. Lacour, B. Laforge, O. Le Dortz, J. Lellouch, G. Marchiori, I. Nikolic-Audit, J. Ocariz, M. Ridel, L. Roos, Ph. Schwemling, Timothée Theveneaux-Pelzer, S. Trincaz-Duvoid, T.N. Trinh, F. Vannucci, L. Aperio Bella, B. Aubert, M. Aurousseau, N. Berger, J. Colas, L. Di Ciaccio, T.K.O. Doan, M. El Kacimi, S. Elles, P. Ghez, M. Gouanère, C. Goy, T. Guillemin, L. Helary, T. Hryn'Ova, P. Iengo, G. Ionescu, A. Jérémie, S. Jézéquel, M. Kataoka, J. Labbe, R. Lafaye, N. Massol, P. Perrodo, H. Przysiezniak, G. Sauvage, T. Todorov, D. Tsionou, I. Wingerter-Seez, R. Zitoun, Y. Zolnierowski, H. Abreu, C. Arnault, E. Auge, P. Barrillon, M. Benoit, S. Binet, J.-B. Blanchard, C. Bourdarios, D. Breton, C. Collard, C. De La Taille, J.B. De Vivie De Regie, S. Diglio, L. Duflot, M. Escalier, A.C. Falou, L. Fayard, D. Fournier, J.-F. Grivaz, M. Heller, S. Henrot-Versille, J. Hrivnac, L. Iconomidou-Fayard, J. Idarraga, M. Kado, A. Lounis, N. Makovec, P. Matricon, Y. Nakahama, F. Niedercorn, L. Poggioli, P. Puzo, A. Renaud, D. Rousseau, X. Ruan, G. Rybkin, J.B. Sauvan, J. Schaarschmidt, A.C. Schaffer, L. Serin, S. Simion, R. Tanaka, J.J. Veillet, I. Vukotic, F. Wicek, D. Zerwas, Zhen Zhang and S. Laplace

Abstract

20 pages plus author list (37 pages total), 11 figures, 1 tables, submitted to Journal EPJ C, see paper for full list of authors.We present first measurements of charged and neutral particle-flow correlations in pp collisions using the ATLAS calorimeters. Data were collected in 2009 and 2010 at centre-of-mass energies of 900 GeV and 7 TeV. Events were selected using a minimum-bias trigger which required a charged particle in scintillation counters on either side of the interaction point. Particle flows, sensitive to the underlying event, are measured using clusters of energy in the ATLAS calorimeters, taking advantage of their fine granularity. No Monte Carlo generator used in this analysis can accurately describe the measurements. The results are independent of those based on charged particles measured by the ATLAS tracking systems and can be used to constrain the parameters of Monte Carlo generators

Topics: [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: Springer Verlag (Germany)
Year: 2011
DOI identifier: 10.1140/epjc
OAI identifier: oai:HAL:in2p3-00575777v1
Provided by: Hal-Diderot
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