Measurement of the longitudinal, transverse and asymmetry fragmentation functions at LEP

OPAL Collaboration

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


The fragmentation function for the process e+e-→h+X, where h represents a hadron, may be decomposed into transverse, longitudinal and asymmetric contributions by analysis of the distribution of polar production angles. A number of new tests of QCD have been proposed using these fragmentation functions, but so far no data have been published on the separate components. We have performed such a separation using data on charged particles from hadronic Z0 decays at Opal, and have compared the results with the predictions of QCD. By integrating the fragmentation functions, we determine the average charged particle multiplicity to be {Mathematical expression}. The longitudinal to total cross-section ratio is determined to be σLtot=0.057±0.005. From the longitudinal fragmentation function we are able to extract the gluon fragmentation function. The connection between the asymmetry fragmentation function and electroweak asymmetrics is discussed.

Original languageEnglish
Pages (from-to)203-213
Number of pages11
JournalEuropean Physical Journal C
Issue number2
StatePublished - 1 Jun 1995
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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