The self-couplings of vector bosons: does LEP-1 obviate LEP-2?
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Rújula, Álvaro de; Gavela, María Belén; Hernández Gamazo, Pilar; Massó, Eduard
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Aquest document és un/a article, creat/da en: 1992
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Theories beyond the standard model (¿meta-theories¿) are severely constrained by the current body of data and must necessarily respect the standard gauge symmetry. We analyze the constraints on two generic types of meta-theory, in which fundamental scalar do or do not exist. The novel low-energy effects can be comprehensively described by grafting onto the standard lagrangian new operators that - in the sense of a Taylor expansion - form a complete set. Completeness calls for consideration of previously discarded operators, and for a thorough exploitation of the equations of motion. We illustrate the current strictures by focusing on the allowed range of departures from the most crucial, untested, precise standard prediction: the size and structure of the triple gauge-boson vertices. We conclude that their direct measurement at LEP-2, while phenomenologically very interesting, is, alas, unlikely to provide new information.
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