Colour Connections in e+e- annihilation

Christer Friberg, Gösta Gustafson, Jari Häkkinen

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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.
    Original languageEnglish
    Pages (from-to)289-305
    JournalNuclear Physics, Section B
    VolumeB490
    DOIs
    Publication statusPublished - 1997

    Subject classification (UKÄ)

    • Subatomic Physics

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