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Elementary particle phenomenology


Our group has been working for more than 15 years on elementary particle phenomenology. In particular, we have analyzed several aspects of the electroweak and strong interactions within the framework of the Standard Model (SM). We have also explored the phenomenological consequences of some extensions of the SM. Our interests are not only limited to the formal aspects of the theory, but also to the relationship between theory and experiments. The goal of this proposal is to obtain support to maintain our research projects which includes the following topics: Charmonium Production: Experimental data obtained by the CDF Collaboration at Fermilab clearly indicate that charmonium production is not well described by the so-called color singlet model. In this project, we analyze the phenomenology of alternative mechanisms for charmonium production, which do not require the formation of the asymptotic state during the hard event. This class of models includes the color evaporation modeI and the color octet model; Diffractive Physics (Rapidity Gaps): The color evaporation model provides a good and simple description of the production of events exhibiting two jets separated by a rapidity gap. In this project, we will compare the predictions of this model with the available data for other diffractive processes, like the diffractive production of W's or jets accompanied by a forward rapidity gap. Our goal is to further confirm this model for hard diffractive events or to uncover its limitations. Perturbative QCD: In hadronic colliders, like the Tevatron and the LHC, the inclusion of higher order QCD correction is necessary in order to perform accurate measurements or to derive precise bounds on new physics. In this project we evaluate next-to-leading order QCD corrections to the production of new particles predicted by extensions of the SM. Extensions to the Standard Model: We shall study the properties and phenomenological consequences of extensions of the standard model, like extra dimensions or supersymmetric theories with bilinear R-parity breaking. Collider study of New Particles and Interactions: We shall continue to analyze the production and decay of new particles predicted by alternative models (e.g. leptoquarks, excited fermions, super-symmetric particles, etc.) and to study new interactions in the bosonic sector of the Standard Model using effective Lagrangians. (AU)

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