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Zeitschrift für Physik C
ISSN: 0170-9739 (printed version)
ISSN: 1431-5858 (electronic version)
Abstract Volume 74 Issue 3 (1997) pp 493-500
Perturbative rates and colour rearrangement effects in four-jet events at LEP2
A. Ballestrero (1), V. A. Khoze (2), E. Maina (1), S. Moretti (1)(3), W. J. Stirling (2)(4)
(1) Dipartimento di Fisica Teorica, Università di Torino, and I.N.F.N., Sezione di Torino, Via Pietro Giuria 1, 10125 Torino, Italy
(2) Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK
(3) Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK
(4) Department of Mathematical Sciences, University of Durham, South Road, Durham DH1 3LE, UK
Received: 6 June 1996
Abstract. An important issue in the direct reconstruction method of determining the W mass from qq\=QQ\= events at LEP2 concerns the impact of the relatively unknown QCD interconnection effects. It has been suggested that a study of `short string' states, in which colour singlet states are formed from qQ\= and Qq\= pairs with small phase-space separation, could shed important light on this issue. We show that such configurations can also be generated by conventional background e+e-->4 parton processes, in particular QCD qq\=gg and qq\=QQ\= and non-resonant electroweak qq\=QQ\= production. We study the colour and kinematic structure of these background contributions, and estimate the event rate to be expected at LEP2. We find that the QCD processes are heavily suppressed, but that non-resonant qq\=QQ\= production may be comparable in rate to the expected `short string' signal from W+W- production.
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