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BARTEL 1980D

JADE collaboration; Bartel, W. et al.
Observation of Planar Three Jet Events in e⁺ e^– Annihilation and Evidence for Gluon Bremsstrahlung
Phys. Lett. 91B (1980) 142;

Abstracts
Topological distributions of charged and neutral hadrons from the reaction e⁺e^– → multihadrons are studied at of about 30 GeV. An excess of planar events is observed at a rate which cannot be explained by statistical fluctuations in the standard two-jet process. The planar events, mostly consisting of a slim jet on one side and a broader jet on the other, are shown actually to possess three-jet structure by demonstrating that the broader jet itself consists of two collinear jets in its own rest system. Detailed agreement between data and predictions is obtained if the process e⁺e^– → q anti-qg is taken into account. This strongly suggests gluon bremsstrahlung as the origin of the planar three-jet events. By comparison of the data with the q anti-qg-model we obtain a value for the strong coupling constant of α_s(q²) = 0.17 ± 0.04.

Accelerator DESY-PETRA Detectors JADE

Related references
See also
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S. Brand and H. D. Dahmen, Z. Phys. C1 (1979) 61;
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Reactions

	e+ e– 2hadron (hadrons)	30 GeV (Ecm)	ang
	e+ e– (jets) 2jet	30 GeV (Ecm)	ang
	e+ e– q anti-q gluon
	q jet
	anti-q jet
	gluon jet

Particles studied

gluon

ex

Record comments
Confirmation of gluon jets.

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