https://doi.org/10.1051/epjconf/201920403014
Determination of centrality in nucleus-nucleus collisions at the MPD/NICA installation
1 Institute for Nuclear Research RAS, Moscow, Russia
2 Joint Institute for Nuclear Research, Dubna, Russia
* e-mail: kurepin@inr.ru
Published online: 3 April 2019
Measurement of the number of spectators in nucleus-nucleus collisions could be used to determine the number of nucleons participating in the interaction, i.e. get information about collision centrality. However, at energies of the NICA collider energy resolution of the forward hadron calorimeter is insufficient for separation of the amplitudes corresponding to different number of spectators. Uncertainty in the number of spectators leads to a large error in determining the centrality. For central events inaccuracy in determining the collision parameter is about 40%, for peripheral ones, no better than 30% at a beam energy of 2.5 A×GeV. The multiplicity scintillator detector will allow to obtain more accurate data. A certain method is proposed for determining the centrality, taking into account the real MPD installation geometry.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
