Eric Laenen
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View article: Next-to-leading power jet functions in the small-mass limit in QED
Next-to-leading power jet functions in the small-mass limit in QED Open
A bstract We investigate the factorization properties of the massive fermion form factor in QED, to next-to-leading power in the fermion mass, and up to two-loop order. For this purpose we define new jet functions that have multiple connec…
View article: NNLL-fast 2.0: Coloured sparticle production at the LHC run 3 with $\sqrt{S}$ = 13.6 TeV
NNLL-fast 2.0: Coloured sparticle production at the LHC run 3 with $\sqrt{S}$ = 13.6 TeV Open
We report on updated precision predictions for total cross sections of coloured supersymmetric particle production at the LHC with a centre-of-mass energy of \sqrt{S} = 13.6 TeV, computed with the modern PDF4LHC21 set. The cross sect…
View article: Next-to-soft radiation from a different angle
Next-to-soft radiation from a different angle Open
Soft and collinear radiation in collider processes can be described in a universal way, that is independent of the underlying process. Recent years have seen a number of approaches for probing whether radiation beyond the leading soft appr…
View article: Event shape distribution and the NLP corrections
Event shape distribution and the NLP corrections Open
For the event shapes thrust and c-parameter at next-to-leading order, we examine the origins of next-to-leading power corrections. We track down the origin of these factors for each shape of the event and compare our findings with a recent…
View article: Region analysis of QED massive fermion form factor
Region analysis of QED massive fermion form factor Open
We perform an analysis of the one- and two-loop massive quark form factor in QED in a region expansion, up to next-to-leading power in the quark mass. This yields an extensive set of regional integrals, categorized into three topologies, a…
View article: Flow Oriented Perturbation Theory
Flow Oriented Perturbation Theory Open
Flow Oriented Perturbation Theory (FOPT) is a novel approach to Feynman diagrams based on the coordinate (position) space description of Quantum Field Theories (QFT). FOPT offers interesting features regarding the computation of higher-loo…
View article: Next-to-leading power resummed rapidity distributions near threshold for Drell-Yan and diphoton production
Next-to-leading power resummed rapidity distributions near threshold for Drell-Yan and diphoton production Open
A bstract We consider Drell-Yan production and QCD-induced diphoton production and compute their rapidity distributions up to next-to-leading power (NLP) in the threshold variable. We give results for rapidity distributions of the Drell-Ya…
View article: Flow Oriented Perturbation Theory
Flow Oriented Perturbation Theory Open
Flow Oriented Perturbation Theory (FOPT) is a novel approach to Feynman diagrams based on the coordinate (position) space description of Quantum Field Theories (QFT). FOPT offers interesting features regarding the computation of higher-loo…
View article: Resurgence analysis of the Adler function at $$ \mathcal{O} $$(1/$$ {N}_f^2 $$)
Resurgence analysis of the Adler function at $$ \mathcal{O} $$(1/$$ {N}_f^2 $$) Open
A bstract We compute non-perturbative contributions to the Adler function, the derivative of the vacuum polarization function in gauge theory, using resurgence methods and Borel-summed gauge field propagators. At 2-loop, to order 1 /N f , …
View article: Next-to-soft radiation from a different angle
Next-to-soft radiation from a different angle Open
Soft and collinear radiation in collider processes can be described in a universal way, that is independent of the underlying process. Recent years have seen a number of approaches for probing whether radiation beyond the leading soft appr…
View article: Next-to-leading power resummed rapidity distributions near threshold for Drell-Yan and diphoton production
Next-to-leading power resummed rapidity distributions near threshold for Drell-Yan and diphoton production Open
We consider Drell-Yan production and QCD-induced diphoton production and compute their rapidity distributions up to next-to-leading power (NLP) in the threshold variable. We give results for rapidity distributions of the Drell-Yan process …
View article: Next-to-leading power corrections to the event shape variables
Next-to-leading power corrections to the event shape variables Open
We investigate the origin of next-to-leading power corrections to the event shapes thrust and $c$-parameter, at next-to-leading order. For both event shapes we trace the origin of such terms in the exact calculation, and compare with a rec…
View article: Resurgence analysis of the Adler function at order $1/N_f^2$
Resurgence analysis of the Adler function at order $1/N_f^2$ Open
We compute non-perturbative contributions to the Adler function, the derivative of the vacuum polarization function in gauge theory, using resurgence methods and Borel-summed gauge field propagators. At 2-loop, to order $1/N_f$, we constru…
View article: Flow-oriented perturbation theory
Flow-oriented perturbation theory Open
We introduce a new diagrammatic approach to perturbative quantum field theory, which we call flow-oriented perturbation theory (FOPT). Within it, Feynman graphs are replaced by strongly connected directed graphs (digraphs). FOPT is a coord…
View article: Towards all-order factorization of QED amplitudes at next-to-leading power
Towards all-order factorization of QED amplitudes at next-to-leading power Open
We generalize the factorization of Abelian gauge theory amplitudes to next-to-leading power (NLP) in a soft scale expansion, following a recent generalization for Yukawa theory. From an all-order power counting analysis of leading and next…
View article: The role of soft quarks in next-to-leading power threshold effects
The role of soft quarks in next-to-leading power threshold effects Open
Cross sections in perturbative QCD are plagued by large corrections from soft and collinear radiation. The most singular terms are known to be universal, which allows their resummation to all orders in the coupling. In our work, we have ex…
View article: Next-to-leading power threshold effects for resummed prompt photon production
Next-to-leading power threshold effects for resummed prompt photon production Open
We assess and compare different methods for including leading threshold logarithms at next-to-leading-power in prompt photon production at hadron colliders, for both the direct and parton fragmentation mechanisms. We do this in addition to…
View article: Universality of next-to-leading power threshold effects for colourless final states in hadronic collisions
Universality of next-to-leading power threshold effects for colourless final states in hadronic collisions Open
We consider the production of an arbitrary number of colour-singlet particles near partonic threshold, and show that next-to-leading order cross sections for this class of processes have a simple universal form at next-to-leading power (NL…
View article: QCD
QCD Open
In these lecture notes I describe the theory of QCD and its application, through perturbation theory, at particle colliders.
View article: Threshold logarithms at next-to-leading power
Threshold logarithms at next-to-leading power Open
We present recent results in an ongoing program to construct a resummation formalism for threshold logarithms at next-to-leading power (NLP) in the threshold expansion.We discuss a factorised expression for the Drell-Yan scattering amplitu…
View article: Next-to-leading power threshold logarithms: a status report
Next-to-leading power threshold logarithms: a status report Open
There is ample evidence, dating as far back as Low's theorem, that the universality of soft emissions extends beyond leading power in the soft energy.This universality can, in principle, be exploited to generalise the formalism of threshol…
View article: NNLL resummation for stop pair-production at the LHC
NNLL resummation for stop pair-production at the LHC Open
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View article: Next-to-leading power threshold logarithms: a status report
Next-to-leading power threshold logarithms: a status report Open
There is ample evidence, dating as far back as Low's theorem, that the universality of soft emissions extends beyond leading power in the soft energy. This universality can, in principle, be exploited to generalise the formalism of thresho…