EAN: 9783319148472

INTRODUCTION TO SOFT-COLLINEAR EFFECTIVE THEORY...

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.

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