Abstract
The azimuthal anisotropy of charged particles in heavy ion collisions is an important probe of quark-gluon plasma evolution at early stages. The nuclear reaction plane can be determined independently by different detector subsystems and using different analysis methods. This paper reports the capability of the CMS detector at the LHC to reconstruct the reaction plane of the collision and to me asure elliptic flow with calorimetry and a tracking system. The analysis is based on a full CMS detector simulation of Pb + Pb events with the HYDJET event generator.
Highlights
In non-central collisions between two nuclei the beam direction and the impact parameter vector define a reaction plane for each event
A measurement of the azimuthal anisotropy of particle production with respect to the reaction plane is one of the important tools for studying the properties of the dense matter created in ultra relativistic heavy-ion collisions
This report is dedicated to studying the capability of the CMS detector at the LHC to reconstruct the reaction plane and to measure elliptic flow, using calorimetry (HCAL, Hadron CALorimeter; and ECAL, Electromagnetic CALorimeter) and the tracking system
Summary
In non-central collisions between two nuclei the beam direction and the impact parameter vector define a reaction plane for each event. A measurement of the azimuthal anisotropy of particle production with respect to the reaction plane is one of the important tools for studying the properties of the dense matter created in ultra relativistic heavy-ion collisions. The magnitude, the ¢¡ and hadron mass dependencies of the radial and elliptic flows below £¡¥¤§¦ GeV/ ̈ are well described by ideal hydrodynamic models whose space-time evolution starts with a realistic QGP equation of state (EoS) with initial energy densities ©¤ GeV/fm at thermalization times ¤ "! This report is dedicated to studying the capability of the CMS detector at the LHC to reconstruct the reaction plane and to measure elliptic flow, using calorimetry (HCAL, Hadron CALorimeter; and ECAL, Electromagnetic CALorimeter) and the tracking system. The high tracking efficiency and low rate of fake tracks, together with a large calorimetric coverage, provide a precise measurement of global event characteristics, event by event
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