[en] Deep seated fluids generate remarkable geochemical processes when forced toward the earth's surface. Intense water-gas-rock interaction reactions characterise fluid motion in the earth's crust due to changes in pressure-volume-temperature conditions. Due to their chemical characteristics noble gases have been indicated as tracers of fluid dynamic changes. Among them ²²²Rn plays an important role due to wide distribution of U, and to low cost monitoring equipment. A correct understanding of transport phenomena is crucially important in data interpretation. The general features of ²²²Rn migration processes are discussed. (author)

[en] Lattice results for matrix elements of light quark operators are reviewed. The discussion is focused on recent theoretical progress and new numerical calculations which appeared after the Lattice 2000 Conference

[en] In this review, three subjects are discussed: a phenomenological application of lattice predictions to K⁰-K-bar⁰ mixing in supersymmetry; a discussion of the non-perturbative renormalization methods for four-fermion operators and a new approach to extract weak matrix elements in effective theories denoted as OPE without OPE (operator product expansion without operator product expansion)

[en] These lectures have been conceived to serve as an elementary introduction to this fascinating field and to offer to non-experts a survey of the most relevant results. The plan of the lectures is the following: in Sect. 2. I will introduce general ingredients and basic concepts of lattice gauge theories and I will present the results for quark confinement in the strong and weak coupling regime. In Sect. 3 I will briefly discuss the problems which arise when one puts fermions on the lattice. In Sect. 4 the strategy of the computation of the hadron mass spectrum and of related quantities relevant for hadron physics will be described and the most important results will be reported. Finally in Sect. 5 I will present the results that have been so far obtained for QCD at finite temperature, a subject which is of great interest for people working in heavy ion collisions

[en] We compute the two-loop term in the perturbation series for the quark-mass in the lattice Heavy Quark Effective Theory (HQET). This is an ingredient in the matching factor required to obtain the b-quark mass from lattice simulations of the HQET at first-order in the Heavy Quark Expansion. Combining our calculation with numerical results from quenched simulations by the APE collaboration, we find, at two-loop order, m-bar_b ≡ m_b^MS-bar(m_b^MS-bar = 4.38 ± 0.05 ± 0.10 GeV. It was expected that the two-loop term would have a significant effect, and this is indeed what we find. Depending on the choice of 'reasonable' coupling constant in the one-loop estimates, the result for m-bar_b can change by several hundred MeV when the two-loop terms are included

[en] We present a calculation of the distribution of high transverse momentum lepton pairs in Drell-Yan processes up to order αsub(S)sup(2)

[en] The author reports some recent theoretical and numerical results about lattice calculation of weak transition amplitudes using Wilson fermions

[en] The theoretical framework for the calculation of ε'/ε is discussed and present predictions are compared to the experimental measurements. Possible contributions from physics beyond the Standard Model will also be considered. The presentation is divided into 6 parts: 1) general theoretical framework, 2) ε'/ε in the Standard Model, 3) the operators of the effective weak Hamiltonian, 4) calculation of the operator matrix elements, 5) ε'/ε beyond the Standard Model, and 6) conclusion and outlook

[en] The results of a phenomenological analysis of heavy flavour production which includes the recently calculated O(α_s³) corrections is presented

[en] The latest results on several weak hadronic amplitudes that have been computed in numerical simulations are reviewed. Many of these results have already had, or are expected to have, a significant impact on the phenomenology of weak interactions, and in particular on understanding of CP violation. The main topics discussed in this review are: leptonic decay constants of pseudoscalar heavy-light mesons, B-B mixing amplitudes, semi-leptonic decays of D and B mesons, radiative decays of B mesons and the Isgur-Wise function