Measurements are presented from proton???proton collisions at centre-of-mass energies of ???s = 0.9, 2.36 and 7 TeV recorded with the ATLAS detector at the LHC. Events were collected using a single-arm minimum- bias trigger. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the relationship between the mean transverse momentum and charged-particle multiplicity are measured. Measurements in different regions of phase space are shown, providing diffraction-reduced measurements as well as more inclusive ones. The observed distributions are corrected to well-defined phase-space regions, using model-independent corrections. The results are compared to each other and to various Monte Carlo (MC) models, including a new AMBT1 pythia6 tune. In all the kinematic regions considered, the particle multiplicities are higher than predicted by the MC models. The central charged-particle multiplicity per event and unit of pseudorapidity,fortrackswithpT>100MeV,ismeasuredtobe3.483±0.009 (stat) ± 0.106 (syst) at ???s = 0.9 TeV and 5.630 ± 0.003 (stat) ± 0.169 (syst) at ???s = 7 TeV.
Charged-particle multiplicities inppinteractions measured with the ATLAS detector at the LHC / Aad, G., Aloisio, A., Alviggi, M., Canale, V., Cevenini, F., Chiefari, G., DELLA VOLPE, D., Merola, L., Patricelli, S., Conventi, F., DELLA PIETRA, M., Giordano, R., Musto, E., Rossi, E., Sanchez, A., Carlino, G., de Asmundis, R., Doria, A., Izzo, V., Sekhniaidze, G.. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 13:(2011), pp. 053033-053098. [10.1088/1367-2630/13/5/053033]
Charged-particle multiplicities inppinteractions measured with the ATLAS detector at the LHC
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CEVENINI, FRANCESCO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;PATRICELLI, SERGIO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi E.;
2011
Abstract
Measurements are presented from proton???proton collisions at centre-of-mass energies of ???s = 0.9, 2.36 and 7 TeV recorded with the ATLAS detector at the LHC. Events were collected using a single-arm minimum- bias trigger. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the relationship between the mean transverse momentum and charged-particle multiplicity are measured. Measurements in different regions of phase space are shown, providing diffraction-reduced measurements as well as more inclusive ones. The observed distributions are corrected to well-defined phase-space regions, using model-independent corrections. The results are compared to each other and to various Monte Carlo (MC) models, including a new AMBT1 pythia6 tune. In all the kinematic regions considered, the particle multiplicities are higher than predicted by the MC models. The central charged-particle multiplicity per event and unit of pseudorapidity,fortrackswithpT>100MeV,ismeasuredtobe3.483±0.009 (stat) ± 0.106 (syst) at ???s = 0.9 TeV and 5.630 ± 0.003 (stat) ± 0.169 (syst) at ???s = 7 TeV.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
