Abstract
The main purpose of the FHCal is to provide an experimental measurement of a heavy-ion collision centrality (impact parameter) and orientation of its reaction plane. FHCal consists of two identical arms placed at the left/right sides from the beam collision point. Due to the fine modular structure and detection of spectators in both forward/backward regions, the angular resolution of the reaction plane reconstruction is below 30 degrees. Since the heavy fragments escape into beam holes, it is not possible to distinguish the central and peripheral collisions using only the deposited energies in FHCal. The subdivision of the calorimeter into two, inner and outer parts, and the calculation of the energy depositions separately in these calorimeter parts allow one to construct a new observable, the energy asymmetry. Taking the two-dimensional correlation between the energy asymmetry and full energy deposition in the calorimeter, it would be possible to resolve the ambiguity in the centrality determination.
Highlights
The goal of the MPD experiment at NICA is to of highly compressed and hot baryonic matter einxptlhoererethgeioQnCoDf tphheacsoelldiidaegrraemneirngythe√rseNgNio=n4 - 11 GeV [1]
The origin of confinement, vacuum properties, and the symmetries of the QCD are among the main topics of the MPD experiment studies.The basic strategy of the MPD experiment is to measure a large variety of observables for heavy-ion collisions as a function of the collision energy, centrality, and the system size
The collision centrality can be determined either by the multiplicity of produced particles in the participant zone or by measuring the energy carried by non-interacting nucleons and detected by the forward hadron calorimeter
Summary
The goal of the MPD experiment at NICA is to of highly compressed and hot baryonic matter einxptlhoererethgeioQnCoDf tphheacsoelldiidaegrraemneirngythe√rseNgNio=n. An experimental estimates of global event characteristics in nucleus-nucleus collisions such as the centrality of the collision which is related to the number of participating nucleons and the reaction plane orientation are challenging tasks for any high-energy heavy-ion experiments including the MPD experiment at NICA. In heavy-ion interactions the event-by-event determination of the collision centrality is used to study observables like the collective flow, particle multiplicities and fluctuations which vary strongly with centrality. The collision centrality can be determined either by the multiplicity of produced particles in the participant zone or by measuring the energy carried by non-interacting nucleons (projectile spectators) and detected by the forward hadron calorimeter. The measurement of the number of projectile spectators allows one to estimate the number of the participants and, the impact parameter b, which are strongly correlated
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