QCD@LHC 2026

Session

Joint: New techniques & Amplitudes

1 Oct 2026, 14:00

University of Oxford

94. Efficient Calculation of Soft functions

Jonathan Richard Gaunt (University of Cyprus)

Joint: New techniques & Amplitudes

Standard slot

Over the past several years, a collection of techniques have enabled the efficient computation of new soft and beam functions at NNLO. In this talk, I show how we have used some of those techniques to compute new soft functions at NNLO, firstly for generalised event shapes at $e^+e^-$ colliders, and secondly for the measurement of boson transverse momentum along with a rapidity-dependent jet...

131. Feynman integral relations from infrared singularities

Federico Coro (Ghent University)

Joint: New techniques & Amplitudes

Standard slot

Precision predictions for LHC processes at NNLO and beyond rely on the efficient reduction of multi-loop Feynman integrals to a small set of master integrals, a task that becomes increasingly computationally expensive as the number of loops and external legs grows. We present a new strategy that constructs integration-by-parts relations directly from the soft and collinear singularities of the...

33. Leading Singularities and Canonical Bases Beyond Polylogarithms

Felix Forner (TUM)

Joint: New techniques & Amplitudes

Standard slot

By now, using differential equations rather than direct integration has become a standard method for computing multi-loop Feynman integrals. The notion of canonical bases, where these differential equations take a particularly simple form, is well understood for integrals that evaluate to multiple polylogarithms. In particular, it is well-known that canonical integrals can be understood as...

77. Local Infrared Factorisation: a Road to Numerical Scattering Amplitudes

Dr Giulio Gambuti (ETH Zurich)

Joint: New techniques & Amplitudes

Standard slot

A detailed picture of the infrared factorisation properties of scattering-amplitude integrands can be exploited to derive finite-remainder representations which are amenable to direct numerical integration. This provides an alternative to the usual analytic approaches. In this talk, I will present a proof-of-concept result: integrand representations for generic two-loop QED amplitudes which...

31. QCD–Gravity Duality and Discrete BFKL Evolution in Multi-Regge Kinematics

Josep Rubi Bort (Instituto de Física Teórica (IFT))

Joint: New techniques & Amplitudes

Standard slot

We present a novel approach to computing duality relations between Quantum Chromodynamics (QCD) and gravity in the Multi-Regge Kinematics (MRK) limit. This framework leverages Mathematica-based tools—FeynArts, FeynCalc, and FeynGrav—with a new implementation that integrates FeynGrav into FeynArts, enabling significantly faster generation of gravity diagrams. We outline the procedure through...

126. Taking the First Steps Toward Higgs Production at N4LO in QCD

Adi Suresh (SLAC)

Joint: New techniques & Amplitudes

Standard slot

We present recent progress toward the inclusive gluon-fusion Higgs-boson and Drell–Yan cross sections at next-to-next-to-next-to-next-to-leading order (N4LO) in perturbative QCD. Our main results concern the single-real contributions, involving three QCD partons together with a Higgs boson or virtual photon. These comprise the interference of one- and two-loop amplitudes and, in the...

58. Three-loop full-color QCD corrections to Higgs-plus-jet amplitudes

Xin Guan (SLAC)

Joint: New techniques & Amplitudes

Standard slot

Higgs-plus-jet production provides direct access to Higgs production at nonzero transverse momentum. In this talk, I will present our calculation of the three-loop full-color QCD corrections to the Higgs-plus-jet amplitudes in the heavy-top limit.

102. Tropical Monte Carlo Integration

Felix Tellander (Trinity College Dublin)

Joint: New techniques & Amplitudes

Standard slot

I will present the method of tropical Monte Carlo integration for scalar Feynman integrals in the software feyntrop. In order to apply this approach in the physical regime, I introduce a parametric representation of Feynman integrals that implements the causal $i\varepsilon$ prescription concretely while retaining projective invariance. feyntrop can efficiently evaluate dimensionally...

61. Two-loop Feynman integrals for ttgamma hadron production in the leading colour approximation

Federico Ripani

Joint: New techniques & Amplitudes

Standard slot

We complete the calculation of the two-loop Feynman integrals required to obtain next-to-next-to-leading order (NNLO) QCD predictions for on-shell top-antitop production in association with a photon at hadron colliders in the leading-colour approximation.
The integrals computed here are also relevant to the subleading-colour contributions to top-antitop production in association with a jet....

35. Two-loop QCD corrections for Higgs plus two-jet production through gluon fusion

Viktor Kuschke (Paul Scherrer Institut, Universitaet Zuerich)

Joint: New techniques & Amplitudes

Standard slot

We present two-loop scattering amplitudes in QCD for the hadronic production of a Higgs boson in association with two jets mediated by the top-quark Yukawa coupling.
Our results cover the dominant contributions for all partonic channels, which are computed in the heavy top-mass limit in the leading-color approximation.
We obtained analytic expressions of the amplitudes decomposed in an...