Renormalization and scale evolution of the soft-quark soft function
A bstract Soft functions defined in terms of matrix elements of soft fields dressed by Wilson lines are central components of factorization theorems for cross sections and decay rates in collider and heavy-quark physics. While in many cases the relevant soft functions are defined in terms of gluon o...
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Published in | The journal of high energy physics Vol. 2020; no. 7; pp. 1 - 37 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.07.2020
Springer Nature B.V Springer Berlin SpringerOpen |
Subjects | |
Online Access | Get full text |
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Summary: | A
bstract
Soft functions defined in terms of matrix elements of soft fields dressed by Wilson lines are central components of factorization theorems for cross sections and decay rates in collider and heavy-quark physics. While in many cases the relevant soft functions are defined in terms of gluon operators, at subleading order in power counting soft functions containing quark fields appear. We present a detailed discussion of the properties of the soft-quark soft function consisting of a quark propagator dressed by two finite-length Wilson lines connecting at one point. This function enters in the factorization theorem for the Higgs-boson decay amplitude of the
h → γγ
process mediated by light-quark loops. We perform the renormalization of this soft function at one-loop order, present a conjecture for its two-loop anomalous dimension and discuss solutions to its renormalization-group evolution equation in momentum space, in Laplace space and in the “diagonal space”, where the evolution is strictly local in the momentum variable. |
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Bibliography: | LA-UR-20-28935 German Research Foundation (DFG) USDOE Office of Science (SC), Nuclear Physics (NP) FG02-04ER41338; AC52-06NA25396; 39083149; 89233218CNA000001 |
ISSN: | 1029-8479 1029-8479 |
DOI: | 10.1007/JHEP07(2020)104 |