Investigation of Colour Reconnection in WW Events with the DELPHI detector at LEP-2

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dc.creatorThe DELPHI Collaboration
dc.creatorAbdallah, J.
dc.date2007-04-04
dc.date.accessioned2026-07-07T11:56:31Z
dc.date.available2026-07-07T11:56:31Z
dc.descriptionIn the reaction e+e- -> WW -> (q_1 qbar_2)(q_3 qbar_4) the usual hadronization models treat the colour singlets q_1 qbar_2 and q_3 qbar_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 kappa parameter most compatible with the data was found to be: kappa_{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.
dc.description39 pages, 18 figures, Accepted by Eur. Phys. J. C
dc.identifierhttps://arxiv.org/abs/0704.0597
dc.identifierhttp://arxiv.org/abs/0704.0597
dc.identifierEur.Phys.J.C51:249-269,2007
dc.identifierdoi:10.1140/epjc/s10052-007-0304-9
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205564
dc.subjectHigh Energy Physics - Experiment
dc.titleInvestigation of Colour Reconnection in WW Events with the DELPHI detector at LEP-2
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