Measurement of three-jet distributions sensitive to the gluon spin ine+e− annihilations at\(\sqrt s = 91\) GeV
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- OPAL Collaboration, Alexander, G., Allison, J. et al. Z. Phys. C - Particles and Fields (1991) 52: 543. doi:10.1007/BF01562326
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Three-jet variables constructed from multi-hadronic events produced byZ0 decays are compared to theoretical calculations assuming a vector gluon or a hypothetical scalar gluon. The data yield conclusive direct evidence for the former case. The distributions of the reduced energy of the second-most energetic jet and of the cosine of the Ellis-Karliner angle are chosen to demonstrate this effect.