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    TH Thursday Seminar

    Spontaneous breaking of colour in the QCD-vacuum

    by Christof WETTERICH (ITP Heidelberg)

    → Europe/Zurich
    TH Auditorium (CERN)

    TH Auditorium

    CERN
    Description
    The vacuum of QCD is characterized by the Higgs mechanism. Colour is 'spontaneously broken' by a quark-antiquark condensate in the octet representation.The massive gluons carry integer electric charges and are identified with the observed vector mesons. The fermionic excitations consist of the low mass baryon octet and a singlet. The interactions between these particles and the light pseudoscalar octet are largely determined by chiral symmetry and a non-linear local symmetry. A consistent phenomenological picture of strong interactions at long distances arises from a simple effective action. Instanton-induced interactions provide the dynamical mechanism for colour symmetry breaking. At high temperature the melting of the octet condensate leads to simultaneous restoration of chiral symmetry and deconfinement.