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

Abdallah, J. and Sopczak, Andre and The DELPHI Collaboration, et al. (2007) Investigation of colour reconnection in WW events with the DELPHI detector at LEP-2. European Physical Journal C: Particles and Fields, 51 (2). pp. 249-269. ISSN 1434-6044

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Abstract

In the reaction e+e-→WW→(q1q̄2)(q3q̄4) the usual hadronization models treat the colour singlets q1q̄2 and q3q̄4 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: κSK-I=2.2+2.5 -1.3 corresponding to the probability of reconnection to be in the range at 68% confidence level with its best value at 0.52.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 18646
Deposited By: ep_ss_importer
Deposited On: 30 Oct 2008 15:29
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:20
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/18646

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