Measurements of underlying-event properties using neutral and charged particles in pp collisions at GeV and TeV with the ATLAS detector at the LHC

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2011-05, Vol.71 (5), p.1-24
• Main Authors: Abbott, B., Aefsky, S., Ahles, F., Akimoto, G., Aleppo, M., Arce, A. T. H., Beckingham, M., Beloborodova, O., Blocker, C., Boterenbrood, H., Botterill, D., Boyd, J., Bozhko, N. I., Brambilla, E., Brandenburg, G. W., Cakir, O., Canale, V., Casadei, D., Caso, C., Cerqueira, A. S., Chepurnov, V. F., De Sanctis, U., Di Girolamo, B., Di Sipio, R., Dova, M. T., Yildiz, H. Duran, Duxfield, R., Ebenstein, W. L., Ferrari, R., Fiolhais, M. C. N., Flores Castillo, L. R., Geerts, D. A. A., Gonidec, A., Hansen, J. B., Harvey, A., Hinchliffe, I., Jaekel, M. R., Jakobs, K., Jakobsen, S., Janus, M., Kaczmarska, A., Kataoka, Y., Kohout, Z., Kordas, K., Kugel, A., Kus, V., La Rotonda, L., Lebel, C., Lenz, T., Lesser, J., Lister, A., Lohwasser, K., Lu, L., Maccarrone, G., Maenner, R., Manning, P. M., Marti-Garcia, S., Mazini, R., McGlone, H., Miele, P., Morin, J., Mosidze, M., Nanava, G., Niinikoski, T., Nomachi, M., Garcia, E. Oliver, Oreglia, M. J., Owen, M., Oyarzun, A., Pinto, B., Plano, W. G., Protopopescu, S., Qian, Z., Ramstedt, M., Rebuzzi, D. M., Ruggieri, F., Ruwiedel, C., Savard, P., Schram, M., Seixas, J. M., Severini, H., Simak, V., Simic, Lj, Sisakyan, A. N., Stanek, R. W., Taiblum, N., Tas, P., Castanheira, M. Teixeira Dias, Tennenbaum-Katan, Y. D., Tsarouchas, C., Tylmad, M., Varela Rodriguez, F., Vazeille, F., Vogel, A., Voss, T. T., Whiteson, D., Wienemann, P., Yao, W.-M., Ye, S., Zmouchko, V. V.
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Cosmology; Charged particles; Collisions; Elementary Particles; Energy measurement; Hadrons; Heavy Ions; Large Hadron Collider; Measurement Science and Instrumentation; Neutral particles; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Experimental Physics; Scintillation counters; String Theory; Tracking systems
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-011-1636-z

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.