Among resummation techniques for perturbative QCD in the context of collider and flavor physics, soft-collinear effective theory (SCET) has emerged as both a powerful and versatile tool, having been applied to a large variety of processes, from B-meson decays to jet production at the LHC. This book provides a concise, pedagogical introduction to this technique. It discusses the expansion of Feynman diagrams around the high-energy limit, followed by the explicit construction of the effective Lagrangian - first for a scalar theory, then for QCD. The underlying concepts are illustrated with the quark vector form factor at large momentum transfer, and the formalism is applied to compute soft-gluon resummation and to perform transverse-momentum resummation for the Drell-Yan process utilizing renormalization group evolution in SCET. Finally, the infrared structure of n-point gauge-theory amplitudes is analyzed by relating them to effective-theory operators. This text is suitable for graduate students and non-specialist researchers alike as it requires only basic knowledge of perturbative QCD.
Among resummation techniques for perturbative QCD in the context of collider and flavor physics, soft-collinear effective theory (SCET) has emerged as both a powerful and versatile tool, having been applied to a large variety of processes, from B-meson decays to jet production at the LHC. This book provides a concise, pedagogical introduction to this technique. It discusses the expansion of Feynman diagrams around the high-energy limit, followed by the explicit construction of the effective Lagrangian - first for a scalar theory, then for QCD. The underlying concepts are illustrated with the quark vector form factor at large momentum transfer, and the formalism is applied to compute soft-gluon resummation and to perform transverse-momentum resummation for the Drell-Yan process utilizing renormalization group evolution in SCET. Finally, the infrared structure of n-point gauge-theory amplitudes is analyzed by relating them to effective-theory operators. This text is suitable for graduate students and non-specialist researchers alike as it requires only basic knowledge of perturbative QCD.
Lo studio della formazione nella prima età moderna di un numero notevole di collegi romani o comunque sotto la supervisione di Roma, dove si doveva formare il clero dei paesi eurpei ed extra-europei, offre due interessanti possibilità ai ricercatori. In primo luogo permetee di seguire le strategie della Santa Sede per diffondere e difendere la fede cattolica in Europa e in Medio Oriente. In secondo luogo facilita l'analisi della cospicua presenza straniera nella città, perché spesso tali collegi divenivano il fulcro di veri e propri gruppi immigrati. Queste due prospettive possono essere incrociate e comparate su scala europea, poiché i collegi romani non erano a sé stanti, ma facevano parte di reti continentali, ben rivelate dalle carte dell'Archivio storico di Propaganda Fide.
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