Marco Guzzi

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We present a study of the trilinear gauge interactions in extensions of the Standard Model (SM) with several anomalous extra U (1)'s, identified in various constructions, from special vacua of string theory to large extra dimensions. In these models an axion and generalized Chern-Simons interactions for anomalies cancellation are present. We derive(More)
The Standard Model indicates the realization of grand unified structures in nature, and can only be viewed as an effective theory below a higher energy cutoff. While the renormalizable Standard Model forbids proton decay mediating operators due to accidental global symmetries, many extensions of the Standard Model introduce such dimension four, five and six(More)
Extensions of the Standard Model with extra neutral currents due to additional anomalous abelian gauge factors are considered. We summarize the main features of the effective action associated to these theories. They are characterized by an axion-like particle (the axi-higgs) which can be (almost) massless, with its mass generated non-perturbatively in the(More)
We analyze the effective actions of anomalous models where a four-dimensional version of the Green-Schwarz mechanism is invoked for the cancellation of the anomalies and we compare it against those models where gauge invariance is restored by the presence of a Wess-Zumino term. Some issues concerning an apparent violation of unitarity of the mechanism,(More)
Projected parameters of the EIC are well-suited for testing for the existence of the nonperturbative intrinsic mechanism for charm quark production. We present estimates for semi-inclusive DIS charm production for various EIC congurations and examine the eects of intrinsic charm contributions. In the variable avor number (VFN) factorization scheme [1, 2,(More)
Discovery potentials for extra neutral interactions at the Large Hadron Collider in forthcoming experiments are analyzed using resonant leptoproduction. For this purpose we use high precision next-to-next-to-leading order (NNLO) determinations of the QCD background in this channel, at the tail of the Drell-Yan distributions, in the invariant mass region(More)
High-statistics deep-inelastic scattering at the EIC can elucidate several open questions about the structure of nucleons and nuclei that cannot be answered solely by measurements at the Large Hadron Collider. These questions include avor composition of PDFs; nuclear correction factors; eect of isospin violation on the PDFs; and behavior of the longitudinal(More)
We analyze the effective actions of anomalous models in which a four-dimensional version of the Green-Schwarz mechanism is invoked for the cancellation of the anomalies, and we compare it with those models in which gauge invariance is restored by the presence of a Wess-Zumino term. Some issues concerning an apparent violation of unitarity of the mechanism,(More)
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may(More)