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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 invari-ance 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)
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)
A NNLO analysis of certain logarithmic expansions, developed for precision studies of the evolution of the QCD parton distributions (pdf) at the large hadron collider, is presented. We elaborate on their relations to all the solutions of the DGLAP equations that have been hitherto obtained from Mellin space, to which are equivalent. Exact expansions,(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)
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 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 200 GeV 2 and 2 M 7 GeV is examined. The Drell–Yan asymmetries turn out to be large, in the range 20 − 40%. We show that the double(More)
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