Abstract
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.
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References
P. Abreu et al., DELPHI collab., Z. Phys. C 50 (1991) 185
P. Abreu et al., DELPHI collab., Phys. Lett. B 276 (1992) 254
R. Akers et al., OPAL collab., Phys. Lett. B 320 (1994) 417
D. Decamp et al., ALEPH collab., Nucl.Instr. Meth. A 294 (1990) 121
D. Buskulic et al., ALEPH collab., Nucl. Inst. Meth. A 360 (1995) 481
T. Sjöstrand and M. Bengston, Comp. Phys. Comm. 43 (1987) 367
M. Bengston and T. Sjöstrand, Phys. Lett. B 185 (1987) 435
D. Buskulic et al., ALEPH collab., Z. Phys. C 55 (1992) 209
D. Buskulic et al., ALEPH collab., Phys. Lett. B 313 (1993) 535
B. Andersson, G. Gustafson and B. Söderberg, Z. Phys. C 20 (1983) 317
L. Lönnblad, Comp. Phys. Comm. 71 (1992) 15
B. Andersson, G. Gustafson and C. Sjögren, Nucl. Phys. B 380 (1992) 391
Ya.I. Azimov et al., Phys.Lett. B 165 (1985) 147; Z. Phys. C 27 (1985) 65
W.J. Stirling, J. Phys. G 17 (1991) 1567
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ALEPH Collaboration. Transverse momentum correlations in hadronic Z decays. Z Phys C - Particles and Fields 73, 421–432 (1997). https://doi.org/10.1007/s002880050331
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DOI: https://doi.org/10.1007/s002880050331