On Color rearrangement in hadronic W+ W- events
Oct, 199363 pages
Published in:
- Z.Phys.C 62 (1994) 281-310
e-Print:
- hep-ph/9310242 [hep-ph]
DOI:
Report number:
- CERN-TH-7011-93,
- DTP-93-74
Citations per year
Abstract: (CERN)
We discuss the possibility of colour rearrangement in \ee \to \W~+ \W~- \to \q_1 \qbar_2 \q_3 \qbar_4 events, i.e.\ that the original colour singlets \q_1 \qbar_2 and \q_3 \qbar_4 may be transmuted, for instance, into new singlets \q_1 \qbar_4 and \q_3 \qbar_2. The effects on event properties could be quite large if such a rearrangement would occur instantaneously, so that gluon emission would be restricted to each of the new singlets separately. We argue that such a scenario is unlikely for two reasons. Firstly, the \W~+ and \W~- usually decay at separate times after the \W~+\W~- production, which leads to large relative phases for energetic radiation off the two constituents of a rearranged system, and a corresponding dampening of the QCD cascades. Secondly, within the perturbative scenario the colour transmutation appears only in order and is colour-suppressed. Colour reconnection at longer time scales is quite feasible, however, and may affect the fragmentation phase. If so, the nature of non-perturbative QCD can be probed in a new way. We formulate several alternative toy models and use these to estimate the colour reconnection probability as a function of the event kinematics. Possible consequences for LEP2 events are illustrated, with special attention to systematic- electron positron: annihilation
- annihilation: electron positron
- W: pair production
- pair production: W
- W: electroproduction
- electroproduction: W
- W: nonleptonic decay
- nonleptonic decay: W
- final state: (2quark 2antiquark)
- (2quark 2antiquark): final state
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