Summary
Some basic properties of renormalized coupling constants are discussed in the framework of spontaneously broken gauge symmetries. It is pointed out that conventional definitions lead to some difficulties connected with infra-red divergences and two possible solutions are suggested. The ultraviolet divergent contributions to the lowest-order particular examples, how these divergent terms cancel in the interrelations between renormalized coupling constants and masses. The specific calcula-tions are carried out in the unitary gauge of theSU 2xU 1 gauges model, using thev-dimensional regularization method.
Riassunto
Si discutono alcume proprietà fondamentali delle costanti di accoppiamento rinorma-lizzate nel contesto delle simmetrie di gauge spontaneamente infrante. Si mette in rilievo che le definizioni convenzionali portano as alcune difficoltà connesse con le diver-genze infrarosse e si suggeriscono due possibili soluzioni. Si studiano poi i contributi alle correzioni di ordine inferiore divergenti nell'ultravioletto e si mostra esplicitamente, con numerosi esempi particolari, come questi termini divergenti si eliminano nelle inter-relazioni fra costanti di accoppiamento rinormalizzate e masse. Si eseguono i calcoli specifici nella gauge unitaria del modello di gaugeSU 2xU 1, facendo uso del metodo di regolarizzazionev-dimensionale.
Резюме
В рамках спонтанно нарушенных калбровочных симметрий обсуж-даются некоторые основные свойства перенорнрованныу констант связи. Отме-чается, что общепринятые оиределения приводят к некоторым трудностям, связан-ным с инфракрасными расходимостями. Предлагаются два возможных рещения. Затем исследуются ультрафиолетовые расуодящиеся вклады в поправки низщего порядка и явно показывается наов, как эти расходящиеся члены взаимно уничтожтся в соотнощениях между перенормированными константами вычисления в унитарной калибровке для SU2xU1 калибровочной модели, используя v-мерный метод регуляризащии.
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This point was already emphasized in ref. (5).
A. Sirlin:Phys. Rev. D,5, 436 (1972). See, in particular, Sect.4 where the method is applied to the study of the pion decay constant. A similar procedure has been used to isolate the infra-red divergent contributions in the electromagnetic corrections to β decay: seeA. Sirlin:Proceedings of the Topical Conference on Weak Interactions, CERN 1969, edited byJ. Prentki andJ. Steinberger (Geneva, 1969), p. 408.
Note, however, that for the evaluation of the finite corrections to the relations among renormalized quantities, it is important to give a precise definition of the coupling constants which takes into account the infra-red difficulty.
Rigorously speaking, the inclusion of the multiplets such as quarks is necessary in order to eliminate the Adler anomalies (see, for example, B. W. LEE's review cited in footnote (2)). As the difficulties associated with the Adler anomalies do not manifest themselves to the order of our calculations, and as there are many different ways to introduce the hadrons, we have neglected them altogether.
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Note added in proofs. - After having submitted this paper for publication we have received a preprint entitled Renormalizatiou of Gauge theories W-decay and μ-decay byT. W. Appelquist, J. R. Primack and H. R. Quinn. Among other subjects, these authors have independently studied the renormalization of theSU 2xU 1 model in the unitary gauge, and have also analysed in detail the role of the infrared divergences in the renormalization program.
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Consejo Nacional de Investigaciones Científicas y Técnicas.
Supported in part by the National Science Foundation.
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Bollini, C.G., Giambiagi, J. & Sirlin, A. Remarks concerning the renormalized coupling constants of the gauge theories. Nuov Cim A 16, 423–436 (1973). https://doi.org/10.1007/BF02819429
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DOI: https://doi.org/10.1007/BF02819429