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Discussion: Perturbative IR divergences in massless gauge theory / Magnea, Lorenzo (speaker) (University of Torino) ; Dixon, Lance (speaker) (SLAC/Stanford University)
2025 - 4120. TH institutes; Infrared Surprises of Scattering Amplitudes External links: Talk details; Event details In : Infrared Surprises of Scattering Amplitudes

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Exploring the infrared structure of massless gauge theories / Magnea, Lorenzo (speaker)
The problem of infrared divergences in gauge-theory scattering amplitudes is as old as quantum field theory, and has been `solved’ many times, with increasing degrees of sophistication. Perhaps surprisingly, it is still at the forefront of current research, both in view of new theoretical developments, and for phenomenological applications. [...]
2024 - 4468. Theory Colloquia External link: Event details In : Exploring the infrared structure of massless gauge theories

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The Infrared Structure of Perturbative Gauge Theories / Agarwal, Neelima (Chaitanya Bharathi Inst. Tech.) ; Magnea, Lorenzo (CERN ; INFN, Turin ; Turin U.) ; Signorile-Signorile, Chiara (KIT, Karlsruhe, IAP) ; Tripathi, Anurag (Indian Inst. Tech., Hyderabad)
Infrared divergences in the perturbative expansion of gauge theory amplitudes and cross sections have been a focus of theoretical investigations for almost a century. New insights still continue to emerge, as higher perturbative orders are explored, and high-precision phenomenological applications demand an ever more refined understanding. [...]
arXiv:2112.07099; CERN-TH-2021-145.- 2022-11-11 - 188 p. - Published in : Phys. Rep. 994 (2023) 1-120 Fulltext: PDF;

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Non-abelian infrared divergences on the celestial sphere / Magnea, Lorenzo (CERN ; INFN, Turin ; Turin U.)
We consider the infrared factorisation of non-abelian multi-particle scattering amplitudes, and we study the form of the universal colour operator responsible for infrared divergences, when expressed in terms of coordinates on the `celestial sphere' intersecting the future light-cone at asymptotic distances. We find that colour-dipole contributions to the infrared operator, to all orders in perturbation theory, have a remarkably simple expression in these coordinates, with scale and coupling dependence factorised from kinematics and colour. [...]
arXiv:2104.10254; CERN-TH-2021-063.- 2021-05-31 - 23 p. - Published in : JHEP 2105 (2021) 282 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;

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Cwebs beyond three loops in multiparton amplitudes / Agarwal, Neelima (Chaitanya Bharathi Inst. Tech.) ; Magnea, Lorenzo (CERN ; Turin U. ; INFN, Turin) ; Pal, Sourav (Indian Inst. Tech., Hyderabad) ; Tripathi, Anurag (Indian Inst. Tech., Hyderabad)
Correlators of Wilson-line operators in non-abelian gauge theories are known to exponentiate, and their logarithms can be organised in terms of collections of Feynman diagrams called webs. In [1] we introduced the concept of Cweb, or correlator web, which is a set of skeleton diagrams built with connected gluon correlators, and we computed the mixing matrices for all Cwebs connecting four or five Wilson lines at four loops. [...]
arXiv:2102.03598.- 2021-03-19 - 52 p. - Published in : JHEP 2103 (2021) 188 Article from SCOAP3: PDF; Fulltext: PDF;

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Analytic integration of soft and collinear radiation in factorised QCD cross sections at NNLO / Magnea, Lorenzo (CERN ; Turin U. ; INFN, Turin) ; Pelliccioli, Giovanni (Wurzburg U.) ; Signorile-Signorile, Chiara (Turin U. ; INFN, Turin ; KIT, Karlsruhe, Dept. Phys.) ; Torrielli, Paolo (Turin U. ; INFN, Turin) ; Uccirati, Sandro (Turin U. ; INFN, Turin)
Within the framework of local analytic sector subtraction, we present the full analytic integration of double-real and real-virtual local infrared counterterms that enter NNLO QCD computations with any number of massless final-state partons. We show that a careful choice of phase-space mappings leads to simple analytic results, including non-singular terms, that can be obtained with conventional integration techniques..
arXiv:2010.14493; P3H-20-061; TTP20-036; CERN-TH-2020-178.- 2021-02-03 - 42 p. - Published in : JHEP 2102 (2021) 037 Article from SCOAP3: PDF; Fulltext: PDF;

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On next-to-eikonal exponentiation / Laenen, Eric (NIKHEF, Amsterdam ; Utrecht U. ; Amsterdam U.) ; Magnea, Lorenzo (CERN ; Turin U. ; INFN, Turin) ; Stavenga, Gerben (Fermilab) ; White, Chris D. (Durham U., IPPP)
The eikonal approximation is at the heart of many theoretical and phenomenological studies involving multiple soft gauge boson emissions in high energy physics. We describe our efforts towards the extension of the eikonal approximation for scattering amplitudes to the first subleading power in the soft momentum..
arXiv:1007.0624; FERMILAB-CONF-10-767-T.- 2010 - 6 p.
Fulltext: arXiv:1007.0624 - PDF; fermilab-conf-10-767-t - PDF; External link: Fermilab Library Server (fulltext available)
In : 10th DESY workshop on elementary particle theory: loops and legs in quantum field theory, Wörlitz, Germany, 25 - 30 Apr 2010, pp.260-265

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The SM and NLO multileg working group: Summary report / Binoth, T. (Edinburgh U.) ; Dissertori, G. (Zurich, ETH) ; Huston, J. (Michigan State U.) ; Pittau, R. (Granada U.) ; Andersen, J.R. (CERN) ; Archibald, J. (Durham U.) ; Badger, S. (DESY) ; Ball, R.D. (Edinburgh U.) ; Bevilacqua, G. (Democritos Nucl. Res. Ctr.) ; Bierenbaum, I. (Valencia U.) et al. /SM and NLO Multileg Working Group
This report summarizes the activities of the SM and NLO Multileg Working Group of the Workshop "Physics at TeV Colliders", Les Houches, France 8-26 June, 2009..
arXiv:1003.1241; SLAC-PUB-14871; FERMILAB-CONF-10-780-T.- 2010 - 169 p. - Published in : , pp. 21-189 Fulltext: arXiv:1003.1241 - PDF; fermilab-conf-10-780-t - PDF; External links: SLAC Document Server; Fermilab Library Server (fulltext available)
In : 6th Workshop on Physics at TeV Colliders, Les Houches, France, 8 - 26 Jun 2009, pp.21-189

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All-order results for infrared and collinear singularities in massless gauge theories / Dixon, Lance J (Stanford U.) ; Gardi, Einan (Edinburgh U.) ; Magnea, Lorenzo (CERN)
We review recent results concerning the all-order structure of infrared and collinear divergences in massless gauge theory amplitudes. While the exponentiation of these divergences for nonabelian gauge theories has been understood for a long time, in the past couple of years we have begun to unravel the all-order structure of the anomalous dimensions that build up the perturbative exponent. [...]
arXiv:1001.4709; SLAC-PUB-13938; EDINBURGH 02-2010; CERN-PH-TH-2010-017; DFTT 01-2010.- 2010 - Published in : PoS RADCOR2009 (2010) 007 Published Version from PoS: PDF; External link: Preprint
In : 9th International Symposium On Radiative Corrections : applications Of Quantum Field Theory To Phenomenology, Ascona, Switzerland, 25 Oct - 30 Oct 2009, pp.007

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On soft singularities at three loops and beyond / Dixon, Lance J (SLAC) ; Gardi, Einan (Edinburgh U.) ; Magnea, Lorenzo (Turin U. ; INFN, Turin ; CERN)
We report on further progress in understanding soft singularities of massless gauge theory scattering amplitudes. Recently, a set of equations was derived based on Sudakov factorization, constraining the soft anomalous dimension matrix of multi-leg scattering amplitudes to any loop order, and relating it to the cusp anomalous dimension. [...]
arXiv:0910.3653; SLAC-PUB-13816; EDINBURGH 08-2009; DFTT 69-2009.- 2010 - Published in : JHEP 02 (2010) 081 Springer Open Access article: PDF; External link: Preprint

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See also: similar author names
53	Magnea, L
43	Magnea, Lorenzo

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