First measurement of the quark to photon fragmentation function
Collaboration
23 pages
Published in:
- Z.Phys.C 69 (1996) 365-378
DOI:
Report number:
- CERN-PPE-95-089,
- CERN-PPE-95-89
Experiments:
View in:
Citations per year
Abstract: (Springer)
Earlier measurements at LEP of isolated hard photons in hadronic Z decays, attributed to radiation from primary quark pairs, have been extended in the ALEPH experiment to include hard photon productioninside hadron jets. Events are selected where all particles combine democratically to form hadron jets, one of which contains a photon with a fractional energyz≥0.7. After statistical subtraction of non-prompt photons, the quark-to-photon fragmentation function,D(z), is extracted directly from the measured 2-jet rate. By taking into account the perturbative contributions toD(z) obtained from anO(ααs) QCD calculation, the unknown non-perturbative component ofD(z) is then determined at highz. Provided due account is taken of hadronization effects nearz=1, a good description of the other event topologies is then found.- electron positron: colliding beams
- colliding beams: electron positron
- electron positron: annihilation
- annihilation: electron positron
- Z0: electroproduction
- electroproduction: Z0
- Z0: hadronic decay
- hadronic decay: Z0
- jet: multiple production
- multiple production: jet
References(20)
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