Marco Guzzi

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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 show that effective anomalous models in four dimensions in which gauge invariance is restored with Wess-Zumino counterterms or with an anomaly inflow from extra dimensions are both affected by the presence of anomaly poles in certain amplitudes which break unitarity in the ultraviolet. In the case of extra dimensions the breaking takes place after any(More)
Exclusive processes mediated by the weak force are an area of investigation which will gather, we believe, a wide interest in the forthcoming years due to the various experimental proposals to detect neutrino oscillations at intermediate energy using neutrino factories and superbeams, [1]. Also, neutrino scattering on nucleons in the deeply virtual(More)
We present next-to-leading order predictions for double transverse-spin asymmetries in Drell–Yan dilepton production initiated by proton–antiproton scattering. The kinematic region of the proposed PAX experiment at GSI: 30 . s . 200GeV and 2 . M . 7GeV is examined. The Drell–Yan asymmetries turn out to be large, in the range 20 − 40%. We show that 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)
Discovery potentials for extra neutral interactions at the Large Hadron Collider in forthcoming experiments are analyzed in Drell-Yan. For this purpose we use high precision next-to-next-to-leading order (NNLO) determination of the invariant mass distributions and of the total cross sections in the kinematic region around 1 TeV. In this region we explore(More)
We present a supersymmetric extension of the Standard Model (USSM-A) with an anomalous U(1) and Stückelberg axions for anomaly cancellation, generalizing similar non-supersymmetric constructions. The model, built by a bottom-up approach, is expected to capture the low-energy supersymmetric description of axionic symmetries in theories with gauged anomalous(More)