scholarly journals Soft-collinear effective theory, light-cone gauge, and theT-Wilson lines

2011 ◽  
Vol 84 (1) ◽  
Author(s):  
Miguel García-Echevarría ◽  
Ahmad Idilbi ◽  
Ignazio Scimemi
Keyword(s):  
Light Cone ◽  
Effective Theory ◽  
Light Cone Gauge ◽  
Soft Collinear Effective Theory ◽  
Theory Light

scholarly journals Light-cone sum rules in soft-collinear effective theory

2006 ◽  
Vol 733 (1-2) ◽  
pp. 1-30 ◽  
Author(s):  
Fulvia De Fazio ◽  
Thorsten Feldmann ◽  
Tobias Hurth
Keyword(s):  
Light Cone ◽  
Sum Rules ◽  
Effective Theory ◽  
Soft Collinear Effective Theory

scholarly journals Precision calculations of B→V form factors from soft-collinear effective theory sum rules on the light-cone

2020 ◽  
Vol 101 (7) ◽  
Author(s):  
Jing Gao ◽  
Cai-Dian Lü ◽  
Yue-Long Shen ◽  
Yu-Ming Wang ◽  
Yan-Bing Wei
Keyword(s):  
Light Cone ◽  
Sum Rules ◽  
Form Factors ◽  
Effective Theory ◽  
Soft Collinear Effective Theory

scholarly journals Light-cone sum rules in soft-collinear effective theory (SCET)

2007 ◽  
Author(s):  
Tobias Hurth ◽  
Fulvia De Fazio ◽  
Thorsten Feldmann
Keyword(s):  
Light Cone ◽  
Sum Rules ◽  
Effective Theory ◽  
Soft Collinear Effective Theory

scholarly journals GREEN–SCHWARZ SUPERSTRINGS ON AdS3 AND THE BOUNDARY N=4 SUPERCONFORMAL ALGEBRA

1999 ◽  
Vol 14 (34) ◽  
pp. 2379-2391 ◽  
Author(s):  
KATSUSHI ITO
Keyword(s):  
Light Cone ◽  
Lie Superalgebra ◽  
Superconformal Algebra ◽  
Liouville Theory ◽  
Effective Theory ◽  
Light Cone Gauge ◽  
Hybrid Formulation ◽  
Free Fields ◽  
Field Redefinition

We study the hybrid formulation of Green–Schwarz superstrings on AdS3 with NS flux and the boundary N=4 superconformal algebra. We show the equivalence between the NSR and GS superstrings by a field redefinition. The boundary N=4 superconformal algebra is realized by the free fields of the affine Lie superalgebra A(1|1)(1). We also consider the light-cone gauge and obtain the N=4 super-Liouville theory which describes the effective theory of the single long string near the singularities of the D1–D5 system.

Effective Field Theory in Particle Physics and Cosmology

2020 ◽  
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Particle Physics ◽  
Large Scale ◽  
Effective Field ◽  
Effective Theory ◽  
Soft Collinear Effective Theory ◽  
Multiple Length Scales ◽  
Cosmological Observations ◽  
Standard Models

Effective field theory (EFT) is a general method for describing quantum systems with multiple-length scales in a tractable fashion. It allows us to perform precise calculations in established models (such as the standard models of particle physics and cosmology), as well as to concisely parametrize possible effects from physics beyond the standard models. EFTs have become key tools in the theoretical analysis of particle physics experiments and cosmological observations, despite being absent from many textbooks. This volume aims to provide a comprehensive introduction to many of the EFTs in use today, and covers topics that include large-scale structure, WIMPs, dark matter, heavy quark effective theory, flavour physics, soft-collinear effective theory, and more.

scholarly journals Consistent treatment of rapidity divergence in soft-collinear effective theory

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Junegone Chay ◽  
Chul Kim
Keyword(s):  
Heavy Quark ◽  
Soft Mode ◽  
Form Factors ◽  
Effective Theory ◽  
Large Rapidity ◽  
Soft Modes ◽  
Heavy Quark Mass ◽  
Soft Collinear Effective Theory ◽  
Matching Procedure ◽  
Consistent Treatment

Abstract In soft-collinear effective theory, we analyze the structure of rapidity divergence due to the collinear and soft modes residing in disparate phase spaces. The idea of an effective theory is applied to a system of collinear modes with large rapidity and soft modes with small rapidity. The large-rapidity (collinear) modes are integrated out to obtain the effective theory for the small-rapidity (soft) modes. The full SCET with the collinear and soft modes should be matched onto the soft theory at the rapidity boundary, and the matching procedure becomes exactly the zero-bin subtraction. The large-rapidity region is out of reach for the soft mode, which results in the rapidity divergence. The rapidity divergence in the collinear sector comes from the zero-bin subtraction, which ensures the cancellation of the rapidity divergences from the soft and collinear sectors. In order to treat the rapidity divergence, we construct the rapidity regulators consistently for all the modes. They are generalized by assigning independent rapidity scales for different collinear directions. The soft regulator incorporates the correct directional dependence when the innate collinear directions are not back-to-back, which is discussed in the N-jet operator. As an application, we consider the Sudakov form factor for the back-to-back collinear current and the soft-collinear current, where the soft rapidity regulator for a soft quark is developed. We extend the analysis to the boosted heavy quark sector and exploit the delicacy with the presence of the heavy quark mass. We present the resummed results of large logarithms in the form factors for various currents with the light and the heavy quarks, employing the renormalization group evolution on the renormalization and the rapidity scales.

scholarly journals Flat self-dual gravity

2021 ◽  
Vol 2021 (8) ◽  
Author(s):  
Kirill Krasnov ◽  
Evgeny Skvortsov
Keyword(s):  
Light Cone ◽  
Space Time ◽  
Kinetic Term ◽  
Light Cone Gauge ◽  
Yang Mills ◽  
Covariant Action ◽  
Chiral Interaction ◽  
Double Copy

Abstract We construct a new covariant action for “flat” self-dual gravity in four space-time dimensions. The action has just one term, but when expanded around an appropriate background gives rise to a kinetic term and a cubic interaction. Upon imposing the light-cone gauge, the action reproduces the expected chiral interaction of Siegel. The new action is in many ways analogous to the known covariant action for self-dual Yang-Mills theory. There is also a sense in which the new self-dual gravity action exhibits the double copy of self-dual Yang-Mills structure.

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