Dilaton interactions and the anomalous breaking of scale invariance of the Standard Model

Claudio Corianò, Luigi Delle Rose, Antonio Quintavalle, Mirko Serino

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We discuss the main features of dilaton interactions for fundamental and effective dilaton fields. In particular, we elaborate on the various ways in which dilatons can couple to the Standard Model and on the role played by the conformal anomaly as a way to characterize their interactions. In the case of a dilaton derived from a metric compactification (graviscalar), we present the structure of the radiative corrections to its decay into two photons, a photon and a Z, two Z gauge bosons and two gluons, together with their renormalization properties. We prove that, in the electroweak sector, the renormalization of the theory is guaranteed only if the Higgs is conformally coupled. For such a dilaton, its coupling to the trace anomaly is quite general, and determines, for instance, an enhancement of its decay rates into two photons and two gluons. We then turn our attention to theories containing a non-gravitational (effective) dilaton, which, in our perturbative analysis, manifests as a pseudo-Nambu Goldstone mode of the dilatation current (J D ). The infrared coupling of such a state to the two-photons and to the two-gluons sector, and the corresponding anomaly enhancements of its decay rates in these channels, is critically analyzed.

Original languageEnglish
Article number77
JournalJournal of High Energy Physics
Issue number6
StatePublished - 1 Jan 2013
Externally publishedYes


  • Beyond Standard Model
  • Large Extra Dimensions
  • Technicolor and Composite Models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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