Transverse momentum correlations in hadronic Z decays
Collaboration
18 pages
Published in:
- Z.Phys.C 73 (1997) 421-432
Report number:
- CERN-PPE-96-085
Experiments:
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Abstract: (Springer)
Using data obtained with the ALEPH detector at the Z resonance, a measure based on transverse momentum is shown to exhibit a correlation between the two halves of a hadronic event which cannot be explained by energy-momentum conservation, flavour conservation, the imposition of an event axis or imperfect event reconstruction. Two possible interpretations based on existing Monte Carlo models are examined: a) ARIADNE, with the correlation forming early in the parton shower and with the transition from partons to hadrons playing only a minor part; b) JETSET, with the correlation forming at the fragmentation stage. A correlation technique based on a jet cluster analysis is used to make a comparison of the models with the data. It is concluded that both non-perturbative and perturbative effects make important contributions to the observed correlation.- electron positron: colliding beams
- electron positron: annihilation
- Z0: electroproduction
- Z0: hadronic decay
- transverse momentum: correlation
- showers: parton
- correlation: parton
- string model
- model: fragmentation
- event shape analysis: cluster
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