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Il Nuovo Cimento A (1965-1970)

, Volume 107, Issue 5, pp 697–711 | Cite as

On the determination of the impact parameter from particle multiplicity measurements in heavy-ion collisions

  • A. Del Zoppo
  • C. Agodi
  • R. Alba
  • G. Bellia
  • R. Coniglione
  • P. Finocchiaro
  • C. Maiolino
  • E. Migneco
  • P. Piattelli
  • D. Santonocito
  • P. Sapienza
Article
  • 23 Downloads

Summary

The event-by-event determination of the impact parameter from particle multiplicity emitted in heavy-ion collisions is considered. The associate problem of the determination of the particle multiplicity on both multi-event and event-by-event basis is formulated and discussed. It is shown that a multi-event data analysis procedure allows an accurate determination of the multipolicity distribution of the emitted particles even with not necessarily large total efficiency and granularity detection systems. In the event-by-event data analysis procedure a fold-to-multiplicity conversion based on the Bayes strategy is adopted. It is shown that a reliable event-by-event multiplicity determination and multiplicity resolution definition cannot prescind from a multi-event analysis of the full data set. It is found that the resolution of the event-by-event fold-to-multiplicity conversion procedure depends on the characteristics of the detection system, but not exclusively. The dependence on the particular multiplicity distribution investigated is discussed. It is concluded that event-by-event high-resolution impact parameter measurements can only be performed with very efficient and granular detection systems, but a gross event classification into central and peripheral collisions can be performed even with detection efficiency as low asΩ=0.3.

PACS

24.90 - Other topics in nuclear reactions and scattering: general 

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Copyright information

© Società Italiana di Fisica 1994

Authors and Affiliations

  • A. Del Zoppo
    • 1
  • C. Agodi
    • 1
  • R. Alba
    • 1
  • G. Bellia
    • 1
    • 2
  • R. Coniglione
    • 1
  • P. Finocchiaro
    • 1
  • C. Maiolino
    • 1
  • E. Migneco
    • 1
    • 2
  • P. Piattelli
    • 1
  • D. Santonocito
    • 1
  • P. Sapienza
    • 1
  1. 1.INFN, Laboratorio Nazionale del SudCatania
  2. 2.Dipartimento di Fisica dell’UniversitàCatania

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