A centrality detector concept

Sourav Tarafdar, Zvi Citron, Alexander Milov

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The nucleus-nucleus impact parameter and collision geometry of a heavy ion collision are typically characterized by assigning a collision "centrality". In all present heavy ion experiments centrality is measured indirectly, by detecting the number of particles or the energy of the particles produced in the interactions, typically at high rapidity. Centrality parameters are associated to the measured detector response using the Glauber model. This approach suffers from systematic uncertainties related to the assumptions about the particle production mechanism and limitations of the Glauber model. In the collider based experiments there is a unique possibility to measure centrality parameters by registering spectator fragments remaining from the collision. This approach does not require model assumptions and relies on the fact that spectators and participants are related via the total number of nucleons in the colliding species. This paper describes the concept of a centrality detector for heavy ion experiment, which measures the total mass number of all fragments by measuring their deflection in the magnetic field of the collider elements.

Original languageEnglish
Pages (from-to)170-178
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - 21 Dec 2014
Externally publishedYes


  • Centrality
  • Hadron collider
  • Heavy ions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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