出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In certain gauges, the Higgs sector of the standard model can be very well described by expanding perturbatively around the expectation value of the Higgs field. However, in general the gaugedependent Higgs expectation value can be zero, and thus a perturbative treatment in these gauges cannot provide an adequate description of experimental results. An example for such a gauge is the Landau limit of the ’t Hooft gauge. Such gauges therefore provide an ideal setting to study the non-perturbative origin of the Higgs effect. Here, these non-perturbative properties are determined using lattice gauge theory for the weak isospin sector of the standard model, i. e., the Higgs and the (in the absence of QED degenerate) W and Z gauge bosons. From the propagators of these particles it is found that the gauge bosons exhibit the spontaneous generation of a screeningmass, in close analogy to the confinement phase, and thus show the expected properties without an explicit breaking of the global weak isospin symmetry. At the same time the Higgs is only slightly modified against its renormalized treelevel behavior, and the running gauge coupling is found to be suppressed at small momenta.
