High Precision for Hard Processes (HP2 2026)

Contribution List

7. Konferenzdinner

10/8/26, 7:00 PM

Höpfner Burghof

55. $N$-jettiness Soft function with massive partons at NNLO

Prem Agarwal

The soft function is a key ingredient in the implementation of $N$-jettiness slicing. At next-to-next-to-leading order (NNLO), $N$-jettiness soft functions are known for arbitrary $N$ in the case of massless particles. We present an extension of this calculation to processes involving massive partons, thereby enabling applications to processes with top quarks, such as $t \bar t$ + jet...

64. A first extraction of gluon TMDs at N3LL from Higgs data

Giuseppe Bozzi (University of Cagliari and INFN, Cagliari)

We present the first extraction of the unpolarised gluon transverse-momentum-dependent (TMD) parton distribution from Higgs-boson production data at the LHC.
The analysis is based on the currently available set of ATLAS and CMS measurements of the Higgs qT distribution at √s= 8 and 13 TeV in the diphoton and four-lepton decay channels.
Theoretical predictions are computed up to N3LL...

74. A parton-shower inspired subtraction scheme for double-real corrections in color-singlet decays

Max Knobbe (Fermilab)

We introduce a local infrared subtraction method for next-to-next-to-leading
order QCD calculations in color singlet decays, with counterterms based on
scalar radiators and pure splitting functions. Overlapping singularities in the
multipole radiation pattern are disentangled by partial fractioning, and the
kinematics mapping corresponds to iterated next-to-leading order...

59. A perturbative framework to probe infrared sensitivity in non-Abelian gauge theories

Dennis Horstmann (KIT)

Understanding the infrared sensitivity of perturbative predictions in QCD is important for assessing the magnitude of possible non-perturbative power corrections to processes with large momentum transfer. In renormalon models, this sensitivity can be related to computable dependences of perturbative quantities on a small gluon mass. However, this procedure cannot be applied to collider...

18. Acyclicity, causality and infrared singularities

Germán Rodrigo (IFIC UV-CSIC)

One of the main strengths of the Loop-Tree Duality representation of scattering amplitudes is that it provides a particularly transparent description of the origin of infrared singularities. This talk will review recent progress in elucidating how infrared singularities emerge and cancel at the level of vacuum amplitudes, how finite integrals can easily be constructed, and will also present a...

71. Analytic form of the elliptic master integrals for gg->hg at two loops

Bakul Agarwal (University of Edinburgh)

We present our analytic calculation of the master integrals for gg->gh at 2-loops with internal top quarks, considering the planar elliptic family. We bring the system of differential equations into the epsilon-factorised form using transformations involving elliptic integrals. We present our approach to find a suitable variable change from the kinematic space to the punctured torus. Using...

23. Analytic two-loop amplitudes for $t\bar{t}j$ production at lepton colliders

Ming-Ming Long (INFN-LNF)

In this talk, I will present an analytic calculation of the two-loop amplitudes for $e^+e^- \to t\bar{t}j$ at leading-colour approximation. The amplitudes are decomposed into linear combinations of independent tensor structures and scalar form factors. The relevant Feynman integrals are computed analytically via the method of differential equation. After transforming the differential equations...

21. Automated calculation of gluon jet functions

Kevin Marc Brune (JGU Mainz)

We present an automated framework for the computation of gluon jet functions to next-to-next-to-leading order (NNLO) in perturbation theory. Our formalism builds on the SoftSERVE strategy that is used to isolate the implicit phase-space divergences of the collinear matrix elements, keeping the observable-specific measurement function generic. This separation enables the numerical evaluation of...

6. Automated matching of a QED parton shower with NLO EW at a future lepton collider

Lois Flower (University of Liverpool)

NLO parton shower matching has been one of the triumphs of QCD research and Monte Carlo development in the past 20 years. With high-precision future electron-positron colliders planned, however, there is an urgent need for theory advances in QED and the electroweak sector. In this talk I will present an automated matching of a QED parton shower with NLO EW calculations for processes at a...

15. Bootstrapping Six-Gluon QCD Amplitudes

Qinglin Yang (Max Planck Institute for Physics, Garching, Germany)

We present a bootstrap construction of planar two-loop six-gluon scattering amplitudes, focusing on the ``most complicated terms'' in the sense of Lipatov. From an analysis of on-shell diagrams, we identify a complete and conformally invariant set of leading singularities. Combining these results with recent advances in understanding the relevant function space and with insights from...

30. Collinear functions up to NNLO in QCD

Prasanna Dhani (University of Zurich)

The singular behaviour of QCD squared amplitudes in the collinear limit is factorized and controlled by splitting kernels with a process-independent structure. We use these kernels to define collinear functions that can be used in resummation formulae of hard-scattering observables. Different collinear functions are obtained by integrating the splitting kernels over different phase-space...

26. DIS-secting the universe with high-energy neutrinos

Lorenzo Guerra (Max Planck Institute for Physics)

We revisit the impact of electroweak (EW) radiative corrections on the kinematic distributions of charged leptons in neutrino-induced Charged-Current (CC) Deep Inelastic Scattering (DIS). We implement full Next-to-Leading Order (NLO) EW corrections to CC DIS in a flexible Monte Carlo framework, supplemented with higher-order logarithmically enhanced final-state QED radiation. We compare our...

72. Efficient Reconstruction of Scattering Amplitudes

Anton Olsson (Karlsruhe Institute of Technology)

We present a new method for reconstructing scattering amplitudes directly in partial-fractioned form. By evaluating the amplitude on its singular surfaces, we derive constraints on the coefficients in the partial-fractioned ansatz. These constraints significantly reduce the number of integration-by-parts samples required for the reconstruction. The resulting amplitude representation is...

50. Electroweak effects in Higgs boson pair production: The quark case

Philipp Rendler (Institute for Theoretical Physics, Karlsruhe Institute of Technology)

We present a study of quark-initiated contributions to Higgs boson pair production. Our result include the NLO QCD corrections to the electroweak quark-antiquark channel and the interference between the electroweak and QCD quark-initiated amplitudes. We compute the two-loop amplitudes analytically using the method of differential equations, with boundary conditions obtained from the large-mass...

65. Event isotropy in perturbative QCD

Daniele Atzori (LPTHE Paris & INFN Genova)

It has recently been proposed that collider events can be equipped with a metric, the Energy Mover’s Distance (EMD), which allows one to rephrase multiple aspects of jet physics in a geometric language. Further, the EMD can be exploited to define new observables that measure the distance between a given event and an idealised one. For instance, event isotropy quantifies the resemblance of an...

17. Exponentially Converging Numerical Evaluation of Iterated Integrals

Thomas Stone (Technical University of Munich (TUM))

We present a method for the high-precision numerical evaluation of transcendental functions appearing in Feynman integrals, based on a natural extension of known techniques for approximating transcendental numbers by rationals. The method easily achieves 100+ digits of precision, is systematically improvable and applies broadly to periods of elliptic curves and Calabi-Yau manifolds, as well as...

36. FeynGraph - A Modern High-Performance Feynman Diagram Toolkit

Jens Braun (Institute for Theoretical Physics (ITP))

We present FeynGraph, a modern high-performance Feynman diagram generation toolkit designed to integrate seamlessly with modern computational workflows for calculating scattering amplitudes. FeynGraph is designed as a high-performance Rust library with easy-to-use Python bindings, allowing it to be readily used in other tools. With additional features like custom diagram selection filters,...

3. Feynman Integrals from First Principles: Positivity, Analyticity, and Padé Approximants

Johannes Henn (Max Planck Institute for Physics)

Precise predictions for cross-sections at present and future particle colliders require reliable methods for evaluating multi-loop Feynman integrals, which are often beyond the reach of direct analytic techniques. In this talk, I will present new numerical approaches that exploit general structural properties of quantum field theory—such as positivity and analyticity—to compute Feynman...

76. Feynman Integrals Meet Second-Order Partial Differential Equations

Hantian Zhang (CERN)

We propose a second-order partial differential equation method to solve multi-loop Feynman integrals as an equilibrium problem. As a proof-of-concept demonstration, we perform a Galerkin discretization of the corresponding variational form and employ the finite element method to compute two-loop four-point Feynman integrals. This method can solve the integral over a broad region of...

48. Feynman integrals numerical evaluation with LINE

Renato Maria Prisco (Max Planck Institute for Physics)

We present the latest developments in LINE, a publicly available computer program for the numerical evaluation of Feynman integrals. By solving differential equations through series expansions, LINE computes boundary values and propagates them efficiently across different kinematic regions while maintaining a strict control over numerical precision. Designed for large-scale computations to...

19. From Leading Singularities to Canonical Bases

Christoph Nega (Max Planck Institut für Gravitationsphysik)

The relationship between unit leading singularities and canonical differential equations has played a central role in modern multi-loop calculations. While this connection is well understood for polylogarithmic integrals, its extension to more general classes of functions has remained unclear.

In this talk, I will present a generalized notion of leading singularities that naturally extends...

75. Full electroweak corrections to Higgs boson pair production in gluon fusion

Augustin Vestner (KIT-ITP)

One of the main goals for the HL-LHC is the measurement of the
trilinear Higgs self-coupling, which can be accessed directly in
processes producing two Higgs bosons simultaneously. Higher order
perturbative corrections to gluon fusion, the dominant production
channel, have a sizable impact on the extracted constraints. In
particular, NLO electroweak corrections distort the...

24. ggxy: Fast and flexible NLO QCD corrections to ZH and VV in gluon fusion

Daniel Stremmer (KIT)

We present the C++ library ggxy, which can be used for the fast and flexible calculation of partonic and hadronic cross sections to gluon-initiated top-mediated processes such as $gg\to HH$. We have extended the functionality of ggxy with the implementation of the $gg\to ZH$ and $gg\to VV$ processes. While all other parts are exact, the two-loop amplitudes with internal top quarks have been...

32. Gluon Jet Function for transverse-momentum-like variables in NNLO QCD

Giovanbattista Favorito (University of Zurich)

We present the computation of the gluon jet function for transverse-momentum-like resolution variables at next-to-next-to-leading order in perturbative QCD. We discuss the relevance of the computation in the context of slicing methods for multi-jet production processes, obtaining results for two jet recombination schemes, namely the E-scheme and the WTA-scheme. The emergence of rapidity...

39. Hadron Fragmentation at Past, Present and Future Colliders

Francesco Merlotti (ETH Zürich)

The production of identified hadrons in collider experiments provides a unique window into Quantum Chromodynamics (QCD) across a wide range of energy scales.
Precision measurements at past, present, and future colliders increasingly demand equally precise theoretical predictions, requiring the interplay of perturbative calculations and global analyses of non-perturbative inputs.
Most...

11. Heavy-quark charge current DIS at NNLO

Pooja Mukherjee (Universität Hamburg)

The contribution of quarks with masses m ≫ ΛQCD is the only part of the structure functions in deep-inelastic scattering (DIS) which is not yet known at the next-to-next-to-leading order (NNLO) of perturbative QCD. We present improved partial NNLO results for the most important structure function F_2 .

66. Higgs boson decay to massive bottom quarks at $\mathcal{O}(\alpha_s^4)$

Marco Niggetiedt (University of Zurich)

The decay into bottom quarks is the dominant decay channel of a Standard Model Higgs boson. Its precise theory description is crucial for extracting the bottom quark Yukawa coupling and mass from experimental measurements. The decay width has been computed through $\mathcal{O}(\alpha_s^4)$ assuming massless final states.
We report on the status of the corresponding four-loop calculation...

49. Higgs Mass Predictions in the CP-Violating High-Scale NMSSM

Dr Christoph Borschensky (Karlsruhe Institute of Technology)

In a supersymmetric theory, large mass hierarchies can lead to large uncertainties in fixed-order calculations of the SM-like Higgs mass. Reliable predictions in an effective field theory (EFT) framework involve the matching to the full supersymmetric theory at the high scale to include contributions from the heavy particles, and a subsequent renormalization-group running down to the low...

60. Higgs-Pair Production via Gluon Fusion: Top-Yukawa- and light-quark-induced electroweak Corrections

Sauro Carlotti (Karlsruher Institut für Technologie - ITP)

After the discovery of the Higgs boson in 2012, the measurements of the Higgs self coupling is still a challenge for current and future experiments in particle physics.
Higgs-boson pair production via gluon fusion is a loop-induced process. In order to increase the accuracy of the theoretical predictions for this process, higher-order corrections are necessary to reduce theoretical...

69. Higher Intersection Pairings for Hard Processes

Giacomo Brunello (Scuola Normale Superiore)

Precision predictions for collider and gravitational-wave observables rely on the efficient evaluation and reduction of multi-loop Feynman integrals. I will present a method for constructing differential equations for Feynman integrals directly from multivariate intersection numbers, bypassing the solution of large systems of integration-by-parts identities. The method exploits the...

40. Infrared divergences and Feynman integral reduction

Pavel Novichkov (Ghent University)

One of the bottlenecks in multiloop amplitude calculations is integration-by-parts (IBP) reduction of the underlying Feynman integrals. In this talk, I will present a recent approach that organizes IBP reduction according to the infrared singularity structure encoded in the Landau equations. More precisely, I will show how syzygy solutions describing unitarity-compatible IBP relations are...

52. Local Analytic Sector Subtraction with initial-state hadrons: Infrared kernels and their integration

Yashasvee Goel (University of Torino and INFN Torino)

In this talk, I will present our recent work on the analytic integration of infrared kernels within the framework of Local Analytic Sector Subtraction. We derive integrated counterterms for initial-state soft and collinear radiation using exact phase-space factorisations. Together with previous work on final-state radiation, these results provide the analytic building blocks needed for generic...

16. Local factorisation of arbitrary two-loop QED amplitudes

Christian Biello (ETHZ)

We present an integrand-level representation of generic two-loop amplitudes in massless Quantum Electrodynamics (QED) that is free of IR singularities. We define building blocks that render the integrand manifestly polarised and Ward-identity preserving, in such a way that spurious (transient) singularities are removed. The full integrands are then assembled by gluing these building blocks...

46. Next-to-Leading-Order QCD and EW Corrections to the Dark Matter Relic Density in the Framework of the CxSM

Karim Elyaouti (KIT - Institut für Theoretische Physik)

This talk presents the computation of the next-to-leading-order (NLO) QCD and electroweak (EW) corrections to the annihilation of dark matter particles into the dominant final states, processes that play a key role in determining the dark matter relic density. The analysis is performed within the Complex Singlet Extension of the Standard Model (CxSM), which enlarges the Standard Model scalar...

44. NLO corrections to inclusive $\bar{B} \to X_s \gamma$ decays at subleading power

Riccardo Bartocci (KIT (Karlsruhe Institute of Technology))

Theoretical predictions in hadron physics are often limited by non-perturbative uncertainties in QCD. Nevertheless, several phenomenologically important processes require improved theoretical control. Effective field theories, such as Soft-Collinear Effective Theory (SCET) and Heavy Quark Effective Theory (HQET), provide powerful tools to overcome these limitations by exploiting...

28. NLO EW corrections to 𝑔𝑔 → 𝐻𝐻 in the forward limit

Dominik Grau (Karlsruher Institute of Technology)

We present an analytical approach for the calculation of the top quark contribution to the two-loop electroweak 𝑔𝑔 → 𝐻𝐻 amplitude. The amplitude is considered in the forward limit, where the Mandelstam variable 𝑡 is small. We expand the amplitude at the level of the integrands and obtain good approximations for large parts of the phase space.

42. NNLO QCD predictions for identified hadron production in association with neutral electroweak gauge bosons.

Gabriele Fiore (ETH Zurich)

Identified hadron production in association with an electroweak gauge boson provides a powerful probe of QCD dynamics and hadron fragmentation in proton-proton collisions. We present next-to-next-to-leading-order (NNLO) QCD predictions for the associated production of a neutral electroweak gauge boson and an identified hadron at high energy colliders. The calculation employs the antenna...

27. NNLO QCD Predictions for Top-Quark Pair Production in Association with a Jet at the LHC

Heribertus Bayu Hartanto (Asia Pacific Center for Theoretical Physics)

I will present next-to-next-to-leading-order (NNLO) QCD predictions for top-quark pair production in association with a jet at the LHC. I will first describe the computation of the two-loop scattering amplitudes in the leading-colour approximation and discuss the impact of the higher-order corrections on the total cross section and selected differential distributions.

13. NNLO QCD predictions for ttW production at hadron colliders

Mattia Pozzoli (University of Bologna and INFN)

In this talk I will present NNLO QCD predictions for the production of a top-antitop quark pair in association with a W boson. While results for this process have previously been obtained employing dynamical approximations for the two-loop virtual correction, this computation is based on the first direct calculation of the two-loop QCD amplitude in the leading-colour approximation. I will...

25. NNLO+PS Higgs-pair production in MiNNLOPS

Francesco Garosi (Max Planck Institut für Physik)

While many of the Higgs couplings have already been measured with remarkable precision, the structure of the Higgs potential is still largely unconstrained. In this context, Higgs-boson pair production plays a special role, as it provides direct access to the Higgs self-coupling.
In this talk, I will present results for Higgs-boson pair production in gluon fusion at hadron colliders at...

45. Non-factorisable electroweak corrections at two-loop order

Fazila Ahmadova (University of Zurich)

In view of the high-precision physics programmes of current and future collider experiments, accurate theoretical predictions for processes involving heavy unstable particles, such as the W and Z bosons or the top quark, are essential. Achieving the required level of precision demands the evaluation of two-loop corrections to the corresponding high-multiplicity and multi-scale amplitudes,...

12. Numerical Evaluation of Multivariate Hypergeometric Functions Using HyperPrecision

Souvik Bera (Asia Pacific Center for Theoretical Physics)

Multivariate hypergeometric functions appear in many areas of theoretical physics and mathematics. We present HyperPrecision, a Mathematica package for the high-precision numerical evaluation of multivariate hypergeometric functions and their $\varepsilon$-expansions. In this talk, we will discuss the algorithm and demonstrate the use of the package, with applications including Feynman...

62. On non-factorizable corrections to vector boson fusion Higgs production

Linus Götzfried (Universität Regensburg)

In this talk, I discuss non-factorizable loop contributions entering the NNLO QCD prediction for Higgs boson production via vector boson fusion at the LHC. Firstly, I present a calculation of the one-loop amplitude to higher orders in the dimensional regulator $\varepsilon$, which is required for infrared subtraction terms. Secondly, for two of the relevant two-loop five-point Feynman integral...

63. OpenLoops+LTD: new developments at NLO and beyond

Nicolo Giraudo (University of Zurich)

OpenLoops+LTD is a new automated NLO parton-level generator that combines aspects of the Loop-Tree Duality technique with the OpenLoops approach. The first part of the talk deals with methodological aspects, with focus on double and triple-cut singularities and local IR cancellations. This is complemented by first NLO QCD results for multi-jet plus multi-boson production at electron-positron...

9. Polarized Scattering at NLO+PS Accuracy in the POWHEG BOX

Ignacio Borsa (Tübingen University)

We present new Monte-Carlo tools for precision phenomenology in longitudinally polarized scattering processes, providing next-to-leading order QCD predictions matched to parton showers (NLO+PS) within the POWHEG BOX framework for di-jet production in polarized proton–proton collisions and polarized deep inelastic scattering. The generators are designed to deliver fully differential predictions...

14. Precise predictions for Higgsstrahlung at future colliders

Aude Gehrmann-De Ridder (ETH Zurich)

We shall present the computation of differential observables including higher order QCD corrections up to NNLO level.

68. Precision physics for quarkonium production and decay

Shubhendu Prasad MANDAL (IJCLab, Universite Paris-Saclay)

The study of quarkonia, which are bound states consisting of a heavy quark and their anti-particle, is quite interesting as these can be used to probe the content of the proton in hadron-hadron collisions. As the strong coupling constant is not too small around the scale of the charm quark mass, perturbative QCD corrections can be large and significant for quarkonium phenomenology. In this...

37. Progress towards numerical reduction at two-loops within the HELAC framework

Dr Aris Spourdalakis (NCSR Demokritos)

I will present the current status in constructing a generic two-loop amplitude reduction algorithm within the HELAC computational framework. Following HELAC tree- and one-loop paradigm, we have completed the generation and validation of the two-loop amplitude-integrand as well as the algebraic reduction for Leading Color gg -> gg. I will present numerical construction and reduction results of...

8. QCD decoupling @ five loops

Peter Marquard (DESY)

We present new results for the decoupling of the strong coupling constant at five loop order

53. Recent developments in NNLOCAL

Gabor Somogyi (HUN-REN Wigner Research Centre for Physics)

Recently, we presented an extension of the CoLoRFulNNLO local subtraction framework for computing higher-order radiative corrections to hadron-initiated processes. Specifically, initial-state radiation has been regularized by introducing analytically integrable counterterms that lead to a relatively small number of counter-events. We have also released a proof-of-concept code, NNLOCAL, which...

33. Recent progress in NNLO QCD predictions for ttW production at hadron colliders

Dr Xiang Chen (University of Zurich)

The production of a top–antitop quark pair in association with a W boson constitutes one of the heaviest final states currently studied at the Large Hadron Collider (LHC). In this talk, I will present recent progress in NNLO QCD predictions for ttW production, enabled by the first direct computation of the required two-loop amplitudes in the generalised leading-colour limit, and discuss the...

41. Reconstructing distributions from Monte-Carlo simulations using orthogonal basis functions

Ivan Novikov (KIT)

Reconstruction of distributions from Monte-Carlo simulations is a standard problem in high-energy physics.
Traditionally, this is done by collecting the generated events in histograms. I will present an alternative approach, the main idea of which is to approximate the target distribution as a sum of orthogonal basis functions with coefficients that are given by certain moments of the target...

22. Recursive reduction of two-loop tensor integrals for automated NNLO calculations

Fabian Lange (Universität Zürich and PSI Center for Neutron and Muon Sciences)

Next-to-next-to-leading order corrections are essential for meeting the precision goals of the LHC and future colliders, making efficient automated NNLO tools increasingly important. Within the OpenLoops framework, the calculation involves loop-momentum tensor integrals, process-dependent tensor coefficients, and process-independent UV and rational counterterms. We present a new recursive...

57. Renormalization of the general Two-Higgs-Doublet Model

Martin Gabelmann (U. Freiburg)

Fully exploiting the precision of current and future collider measurements requires theory predictions of matching accuracy, and hence observables computed at next-to-leading order (NLO) and beyond. For any Beyond-the-Standard-Model scenario, such higher-order calculations require a complete and consistent renormalization of the model. We address this task for the general Two-Higgs-Doublet...

5. Resonance aware QCD+EW MC@NLO matched parton showers

Joanne Roper (Durham University)

Parton showers are an essential feature of event generation that provide a numerical resummation of the large logarithms that enhance soft and collinear radiation. Matching them to higher order calculations requires careful treatment in order to avoid double-counting real radiation and preserve fixed order accuracy through matching algorithms such as MC@NLO. As we approach HL-LHC, there is a...

56. Soft-photon resummation for low-energy e⁺e⁻ scattering

Jeremy Paltrinieri (University of Liverpool)

Precision studies of low-energy e⁺e⁻ annihilation, most notably the extraction of the hadronic vacuum polarisation contribution to the muon anomalous magnetic moment, require theoretical control over the multi-photon radiation phase-space. This demands inclusion of soft photon emission to all orders, consistently matched to fixed-order cross-sections.
I present a Fortran implementation of...

70. Spin covariance and polarization of helicity amplitudes with massive vector bosons

Matteo Tresoldi (KIT TTP)

Loop amplitudes describing the transition of an electroweak vector boson into QCD partons are important ingredients for precision phenomenology at the LHC. Existing compact analytic results are commonly expressed in the massless spinor-helicity formalism using a leptonic current in place of the vector-boson polarization vector and, therefore, appear to describe only its transverse polarization...

61. Stable NNLO QCD predictions for quarkonium production and decay

Lukas Simon (LPTHE - CNRS et Sorbonne Université)

Perturbative instabilities at next-to-next-to-leading order (NNLO) have become a recurring challenge in theoretical predictions for quarkonium production and decay within the NRQCD framework, often leading to large corrections, enhanced scale dependence, or even unphysical negative cross sections and decay widths. In this talk, I will present our recent work addressing the origin of these...

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

Adi Prasanna Suresh (SLAC and Stanford U.)

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...

77. The emerging importance of high energy logarithms for LHC studies

Sebastian Jaskiewicz (Bern U.)

In this talk, I will discuss the growing importance of controlling high-energy logarithms in predictions for LHC processes. In a recent ATLAS measurement [arXiv:2403.02793], state-of-the-art matched parton-shower predictions for a hard photon or an electroweak
vector boson in association with at least two jets (pp→{γ,Z,W}+jj) deviate systematically from data as the partonic collision energy...

31. Three-loop amplitudes for quark-initiated diboson production in the leading-color approximation

Dhimiter Canko (University of Turin)

I will present the computation of the three-loop QCD scattering amplitudes for the production of two massive vector bosons in the quark annihilation channel, in the generalized leading-color approximation. These amplitudes constitute a key ingredient for the virtual contribution to the N3LO QCD corrections for electroweak gauge-boson pair production at hadron colliders and represent an...

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

Xin Guan (SLAC)

We present helicity amplitudes at three loops in the heavy-top quark effective theory of QCD for the scattering of a Higgs boson and three light partons with full-color dependence. We observe that sub-leading color contributions at three loops are numerically as significant as leading-color terms. Our amplitudes are key ingredients for precision LHC phenomenology, for example in production...

29. Three-loop mixed QCD-EW form factors to the on-shell $Z$ production at hadron colliders

Tanmoy Pati (NISER-HBNI)

The Drell Yan process serves as standard candle in order to identify beyond Standard Model signatures. In this talk, we plan to focus on the virtual correction to the Z-production at the order $\mathcal{O}(\alpha_s^2\alpha)$, which constitute a subset of the factorizable electroweak-QCD corrections to Drell-Yan at resonance. Our results are complete analytic, which offers advantages in...

51. Three-loop QCD corrections to gg->HH at leading power in the high-energy limit

Ajjath A H (IISc, Bangalore, India)

We report progress toward understanding quark-mass effects in the (gg \rightarrow HH) amplitude at NNLO, at leading power in the high-energy limit (s, |t|, |u| \gg m_t^2 \gg m_H^2). The logarithmic behavior of this process in this regime has recently been shown to follow a predictable, factorized pattern at leading power. We present results for the three-loop virtual QCD corrections in...

54. Threshold resummation of rapidity distributions at fixed partonic rapidity

Davide Maria Tagliabue (KIT (TTP))

I present an all-order direct-QCD resummation of rapidity distributions in the threshold limit at fixed partonic rapidity. The formalism is applied to Drell–Yan production, where matching to NNLO determines the resummation coefficients up to NNLL accuracy. I then show the equivalence between our approach and the corresponding SCET formulation.

20. Top quark mass effects in WW production through gluon fusion

Mateusz Pawel Czaja (KIT TTP)

The di-boson WW production is an important process for the precision tests of the Standard Model at the electroweak scale. In addition, it is one of the most significant backgrounds in the H→WW decay. While the gluon fusion production channel contributes only around 5% of the cross section, it is expected to receive sizable QCD corrections that will become significant during the High...

10. Top Quark Pair Production and Decay: The 1-Higgs-Singlet Model and Pseudoscalar Decay

Vishakha Lingadahally (Royal Holloway, University of London)

The process of top quark pair production through the decay of the scalars in the 1 Higgs Singlet extension of the Standard Model is associated with large interference effects between the loop-induced 'SM-like' Higgs and the heavy Higgs amplitudes, and the QCD continuum background. We attach leptonic decays to the di-top final state at NLO and study the effects of spin correlation in the...

58. Towards NNLO QED corrections to radiative return processes

Mr Thomas Dave (University of Liverpool), Mr Pau Petit Rosas (University of Liverpool), William Torres Bobadilla (Universidad de Salamanca)

We present the analytic calculation of the two-loop QED corrections to the process $e^+e^-\to\gamma\gamma^*\to \pi^+\pi^- (\mu^+\mu^-)$, focusing on the initial-state radiation contribution, where the energetic photon is emitted from the leptonic line. The calculation is performed retaining the full dependence on all kinematic invariants, without resorting to small-mass approximations. This...

38. Two-loop Feynman integrals for $t \bar{t} \gamma$ hadron production in the leading colour approximation

Colomba Brancaccio (University of Turin)

In this talk, I will present the calculation of the Feynman integrals entering the two-loop scattering amplitudes for top–antitop pair production in association with a photon, in the leading-colour approximation, required for NNLO QCD predictions at hadron colliders.
The kinematics of the process, involving six independent invariants and up to three massive propagators, leads to a high degree...

67. Two-loop mixed QCD-EW corrections to quark-induced Higgs production at hadron colliders

Federico Ripani

We present the exact next-to-leading-order QCD corrections to the light-quark part of the mixed QCD-EW contributions to quark-induced Higgs production at the Large Hadron Collider, for a center-of-mass energy of 13 TeV, with exact EW-boson mass dependence. The relevant two-loop real-emission matrix elements, $gq(\overline{q})\to q(\overline{q})H$ and $q\overline{q}\to gH$, are computed using...

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

Viktor Kuschke (PSI, UZH)

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...

35. Universal feature of NLP corrections

Sourav Pal (JGU Mainz)

The inclusion of next-to-leading-power (NLP) corrections is essential for achieving the percent-level theoretical precision required at the LHC. We present a new approach, based on soft theorems, for calculating leading logarithms at NLP for a variety of jet-associated processes and demonstrate their universal features for both soft-gluon and soft-quark radiation.

4. Untangling the IBP equations

Junhan William Liu (University of Cambridge)

In this talk, we will present a general strategy for solving integration-by-parts (IBP) identities. Our approach is based on the diagonalisation of the IBP system, which effectively reduces it to single-variable recurrence relations. To the best of our knowledge, this is achieved here for the first time of its use. This framework yields an iterative reduction procedure that enables highly...

43. ZH production in gluon fusion at NLO QCD within SMEFT

Benjamin Campillo (KIT)

Gluon-induced production of a Higgs boson in association with a Z-boson is an important Higgs production channel at the LHC. Precise theoretical predictions for this channel are therefore required, both within the Standard Model and beyond. Effects beyond the SM can be parametrized using the Standard Model Effective Field Theory (SMEFT).
In this talk, we present the NLO QCD predictions for...