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Determination of semi-muonic branching ratios and fragmentation functions of heavy quarks ine + e − annihilation at ⟨s√⟩ =34.6 GeV

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  • JADE Collaboration
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<mark>Journal publication date</mark>1987
<mark>Journal</mark>Zeitschrift für Physik C Particles and Fields
Issue number3
Volume33
Number of pages11
Pages (from-to)339-349
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

Muon inclusive multihadronic final states ine + e − annihilation at ⟨s√⟩ =34.6 GeV, collected by the JADE detector at PETRA, have been analysed in terms of the semi-muonic branching ratios and fragmentation functions of heavy quarks. Defining the fragmentation variable, ζ, as z=(E+p∥)hadron(E+p)quark we find <z c >=(77±3±5)% and <z b >=(86±4±5)%. The corresponding semi-muonic branching ratios are measured to be BR(c→μv μ X)=7.8±1.5±2)% and BR (b→μv μ X)=(11.7±1.6±1.5)%. Defining ζ as xE=EhadronEbeam we observe an expected softening effect in the fragmentation due mainly to gluon emission, but find that this definition leads to semi-muonic branching ratiomeasurements which are strongly affected by uncertainties in the fragmentation process and the WCD calculation.