Titlebook: Introduction to Soft-Collinear Effective Theory; Thomas Becher,Alessandro Broggio,Andrea Ferroglia Book 2015 Springer International Publis

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Introduction,quantum field theory. EFTs allow one to expand physical quantities in the small ratio of the scales and to separate the low-energy contributions from the high-energy part. Performing the expansion usually greatly simplifies the problem and is often necessary in order to be able to attack a field-the

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Scalar SCET, were considered in the previous section. Initially we restrict our discussion to the case of a scalar .. theory. The procedure outlined in the following will be applied to QCD in Chap. .; however, since the different components of the quark and gluon fields scale differently, the effective Lagrangi

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Generalization to QCD,lar .. theory in the previous section; in addition, many elements are the same as in the scalar case. In particular, the same momentum regions appear, since only the numerators of the diagrams differ between the .. theory case and the QCD case.

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Resummation by RG Evolution, out the full computation of the resummed cross section in the case of Drell-Yan scattering. Here, in order to keep our discussion simple, we first consider the case of the Sudakov form factor in QCD for which the relevant factorization (in the sense of scale separation) theoremwas obtained at the e

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,-Jet Processes and IR Divergences of Gauge Theory Amplitudes,an cross section. However, many processes involve multiple directions of large energy flow. These include collider processes with several jets of energetic particles in the final state. In this section, we will discuss the effective theory relevant for observables which involve . directions of large

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Generalization to QCD,lar .. theory in the previous section; in addition, many elements are the same as in the scalar case. In particular, the same momentum regions appear, since only the numerators of the diagrams differ between the .. theory case and the QCD case.

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