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

Authors: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, J.
Piedra, Jonatan
Keywords: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
Issue Date:5-May-2007
Società Italiana di Fisica
Citation:European Physical Journal C 51(2): 249-269 (2007)
Abstract:In 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.
Description:21 páginas, 18 figuras, 6 tablas.-- El Pdf del artículo es la versión pre-print: arXiv:0704.0597v1.-- DELPHI Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1140/epjc/s10052-007-0304-9
ISSN:1434-6044 (Print)
1434-6052 (Online)
Appears in Collections:(IFCA) Artículos
(IFIC) Artículos

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