Observables in Higgsed Theories

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• 作者：Axel Maas¹ ; ^{Axel.Maas@uni-graz.at" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Higgs sector ; Brout-Englert-Higgs effect ; Gauge symmetry ; Observables ; Lattice ; 2-Higgs-doublet model
• 刊名：Nuclear and Particle Physics Proceedings
• 出版年：2016
• 出版时间：April-June 2016
• 年：2016
• 卷：273-275
• 期：Complete
• 页码：1604-1610
• 全文大小：209 K

文摘

In gauge theories, observable quantities have to be gauge-invariant. In general, this requires composite operators, which usually have substantially different properties, e. g. masses, than the elementary particles. Theories with a Higgs field, in which the Brout-Englert-Higgs effect is active, provide an interesting exception to this rule. Due to an intricate mechanism, the Fröhlich-Morchio-Strocchi mechanism, the masses of the composite operators with the same J^P$J^P$ quantum numbers, but modified internal quantum numbers, have the same masses. This mechanism is supported using lattice gauge theory for the standard-model Higgs sector, i. e. Yang-Mills-Higgs theory with gauge group SU(2) and custodial symmetry group SU(2). Furthermore, the extension to the 2-Higgs-doublet-model is briefly discussed, and some preliminary results are presented.