Measurement of the longitudinal cross-section using the direction of the thrust axis in hadronic events at LEP

OPAL Collaboration

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

In the process e+e- → hadrons, one of the effects of gluon emission is to modify the (1 + cos2θ) form of the angular distribution of the thrust axis, an effect which may be quantified by the longitudinal cross-section. Using the OPAL detector at LEP, we have determined the longitudinal to total cross-section ratio to be σLtot = 0.0127 ± 0.0016 ± 0.0013 at the parton level, in good agreement with the expectation of QCD computed to script O sign(α2s). Comparisons at the hadron level with Monte Carlo models are presented. The dependence of the longitudinal cross-section on the value of thrust has also been studied, and provides a new test of QCD.

Original languageEnglish
Pages (from-to)393-402
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume440
Issue number3-4
DOIs
StatePublished - 19 Nov 1998
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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