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.

Transverse momentum correlations in hadronic Z decays / Focardi, E., Debonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.P., Lucotte, A., Minard, M.N., Nief, J.Y., Odier, P., Pietrzyk, B., Casado, M.P., Chmeissani, M., Crespo, J.M., Delfino, M., Efthymiopoulos, I., Fernandez, E., Fernandezbosman, M., Garrido, L., Juste, A., et al.. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - STAMPA. - 73:(1997), pp. 421-432. [10.1007/s002880050331]

Transverse momentum correlations in hadronic Z decays

FOCARDI, ETTORE;CIULLI, VITALIANO;
1997

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.
1997
73
421
432
Focardi, Ettore; Debonis, I.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J. P.; Lucotte, A.; Minard, M. N.; Nief, J. Y.; Odier, P.; Pietrzyk, B.; Casado, M....espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/772456
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