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Gösta Gustafson. Photo.

Gösta Gustafson

Post retirement professor

Gösta Gustafson. Photo.

Colour Connections in e+e- annihilation

Author

  • Christer Friberg
  • Gösta Gustafson
  • Jari Häkkinen

Summary, in English

We have a very limited knowledge about how the confinement mechanism works in

processes like $\epea\epe\ra\epq\epqa\ggn\ldots\ggn$, when there are identical

colour charges. In this case the partons can be colour connected by a string or

a cluster chain in several different ways. We do not know if in such a situation

Nature chooses a particular configuration at random, or if some configuration is

dynamically favoured. Also in the perturbative parton cascade we have no well

founded recipe for describing the interference effects, which correspond to non

planar diagrams and are caused by identical colour charges. We have studied two

different models, and are in particular interested in the possibility that a

colour singlet gluon system hadronizes isolated from the remainder of the state.

Using double tagged events with heavy $\epc\epca$ or $\epb\epba$ quarks, it

appears to be possible to find a significant signal, if such events appear in

Nature.



If this type of (re)connected states appear in Z decays it may also be an

indication that reconnection might appear between the decay products of two W's

in the reaction $\epea\epe\ra\gwp\gwm\ra\epq_1\epqa_2\epQ_1\epQa_2$ at LEP2.

This would be important e.g. for a precision measurement of the W mass.

Department/s

  • Theoretical Particle Physics
  • Department of Astronomy and Theoretical Physics

Publishing year

1997

Language

English

Pages

289-305

Publication/Series

Nuclear Physics, Section B

Volume

B490

Document type

Journal article

Publisher

North-Holland

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0550-3213