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Título

Investigation of colour reconnection in WW events with the DELPHI detector at LEP-2

Autor Abdallah, J.; Martínez-Rivero, Celso ; Rivero, M.; Costa, María José ; Matorras, Francisco ; Cuevas, Javier ; Oyanguren, Arantza ; Marco, Jesús ; Tortosa, Pablo ; Ferrer, Antonio ; Salt, José ; Marco, Rafael ; García García, Carmen ; Gómez-Ceballos, Guillelmo; Rodríguez, David; Fuster, Juan ; Marín, J. C.; López, Juan M. ; Fernández Menéndez, Javier ; Piedra, Jonatan
Palabras clave Colour reconnection (CR)
Bose-Einstein Correlations
Hadronic Z(0) Decays
e(+)e(-) Collisions
w+w- events
Pair Production
Identified Particles
e+e- Annihilation
Charged Pions
Final-states
Fecha de publicación 5-may-2007
EditorSpringer
Società Italiana di Fisica
Citación European Physical Journal C 51(2): 249-269 (2007)
ResumenIn the reaction e(+)e(-) --> WW --> (q(1)(q)over-bar(2))(q(3)(q)over-bar(4)) the usual hadronization models treat the colour singlets q(1)(q)over-bar(2) and q(3)(q)over-bar(4) coming from two W bosons independently. However, since the final state partons may coexist in space and time, cross-talk between the two evolving hadronic systems may be possible during fragmentation through soft gluon exchange. This effect is known as colour reconnection. In this article the results of the investigation of colour reconnection effects in fully hadronic decays of W pairs in DELPHI at LEP are presented. Two complementary analyses were performed, studying the particle flow between jets and W mass estimators, with negligible correlation between them, and the results were combined and compared to models. In the framework of the SK-I model, the value for its κ parameter most compatible with the data was found to be: κ_{SK-I} = 2.2^{+2.5}_{-1.3} corresponding to the probability of reconnection P_{reco} to be in the range 0.31 < P_{reco} < 0.68 at 68% confidence level with its best value at 0.52.
Descripción 21 páginas, 18 figuras, 6 tablas.-- El Pdf del artículo es la versión pre-print: arXiv:0704.0597v1.-- DELPHI Collaboration: et al.
Versión del editorhttp://dx.doi.org/10.1140/epjc/s10052-007-0304-9
URI http://hdl.handle.net/10261/8524
DOI10.1140/epjc/s10052-007-0304-9
ISSN1434-6044 (Print)
1434-6052 (Online)
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