Hadron formation in deep-inelastic positron scattering in a nuclear environment

HERMES Collaboration

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The influence of the nuclear medium on the production of charged hadrons in semi-inclusive deep-inelastic scattering has been studied by the HERMES experiment at DESY using a 27.5 GeV positron beam. The differential multiplicity of charged hadrons and identified charged pions from nitrogen relative to that from deuterium has been measured as a function of the virtual photon energy nu and the fraction z of this energy transferred to the hadron. There are observed substantial reductions of the multiplicity ratio R-M(h) at low nu and at high z, both of which are well described by a gluon-bremsstrahlung model of hadronization. A significant difference of the nu -dependence of R-M(h) is found between positive and negative A hadrons. This is interpreted in terms of a difference between the formation times of protons and pions, using a phenomenological model to describe the nu- and z-dependence of R-M(h).
Original languageEnglish
Pages (from-to)479-486
Number of pages8
JournalEuropean Physical Journal C
Volume20
Issue number3
DOIs
Publication statusPublished - 1 May 2001
Externally publishedYes

Keywords

  • COLOR TRANSPARENCY
  • ELECTROMAGNETIC CORRECTIONS
  • ELECTROPRODUCTION
  • QUARKS
  • FRAGMENTATION
  • ATTENUATION
  • TARGETS
  • MESONS
  • TIME

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