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Percorrer por autor "Lourenco, Carlos"

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  • Minimal physical constraints on the angular distributions of two-body boson decays
    Publication . Faccioli, Pietro; Lourenco, Carlos; Seixas, Joao; Woehri, Hermine
    The angular distribution of the two-body decay of a boson of unknown properties is strongly constrained by angular momentum conservation and rotation invariance, as well as by the nature of the detected decay particles and of the colliding ones. Knowing the border between the "physical" and "unphysical" parameter domains defined by these "minimal constraints" (excluding specific hypotheses on what is still subject of measurement) is a useful ingredient in the experimental determinations of angular distributions and can provide model-independent criteria for spin characterizations. In particular, analysing the angular decay distribution with the general parametrization for the J = 2 case can provide a model-independent discrimination between the J = 0 and J = 2 hypotheses for a particle produced by two real gluons and decaying into two real photons.
    2013-08-05Artigo científico Acesso aberto Ver mais
  • Quarkonium production in the LHC era: a polarized perspective
    Publication . Faccioli, Pietro; Knünz, Valentin; Lourenco, Carlos; Seixas, João; Wöhri, Hermine K.
    Polarization measurements are usually considered as the most difficult challenge for the QCD description of quarkonium production. In fact, global data fits for the determination of the non-perturbative parameters of bound-state formation traditionally exclude polarization observables and use them as a posteriori verifications of the predictions, with perplexing results. With a change of perspective, we move polarization data to the centre of the study, advocating that they actually provide the strongest fundamental indications about the production mechanisms, even before we explicitly consider perturbative calculations.
    2014-09-07Artigo científico Acesso aberto Ver mais