Gluon fusion processes like single and double Higgs production exhibit slow convergence and pose severe computational challenges. We show how the top-quark mass dependence of the virtual amplitudes can be reconstructed with a conformal mapping and Pad\'e approximants based on the expansion in the inverse top-quark mass and the non-analytic terms in the expansion around the top threshold. The method is then applied at two- and three-loop order.

Top quark condensate

10.48550/arxiv.1912.04097

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Global Sensitivity Analysis of a Novel Signaling Network for Heart Growth With Local IGF1 Production

International Journal for Numerical Methods in Biomedical Engineering (2025)

Christian Bilas Claus Kratzer Arne Hinrichs Andreas Maier Stephen M. Wildhirt

Signaling networks can be used to describe the dynamic interplay of hormonal and mechanical factors that regulate heart growth. However, a qualitative analysis of signaling networks is often difficult due to their complexity and nonlinear behavior. In this work, a global sensitivity analysis of signaling networks is conducted to determine the most influential factors for heart growth over a range of model inputs. Furthermore, the local production of the hormone insulin-like growth factor 1 (IGF1) in response to high mechanical stretches as recently described by Zaman et al.(Immunity, 54, 2057) and Wong et al.(Immunity, 54, 2072) is incorporated. The computational results show that this increases the influence of mechanical stretch on heart growth significantly. Further key influential factors are the hormones norepinephrine (NE), angiotensin II (AngII), and globally produced IGF1 (g-IGF1). Our sensitivity analysis indicates that the novel consideration of local IGF1 (l-IGF1) production has to be considered in signaling networks for heart growth.

10.1002/cnm.3906

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The Gravitational Potential of Two Point Masses at Five Loops

arXiv (Cornell University) (2019)

J. Blümlein Andreas Maier Peter Marquard

Corrections to the Newtonian gravitational potential from general relativity can be derived in a combined expansion around flat spacetime and a small velocity of the interacting bodies. We present the calculation of the static five-loop corrections in an effective field theory framework using techniques from multi-loop computations in particle physics.

Newtonian potential

Gravitational potential

Point particle

Source

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Nachhaltig, regional, entwickelt?

Raumforschung und Raumordnung / Spatial Research and Planning (2000)

Andreas Maier

The first section of this article deals with the concept of “sustainability” and examines the broader conditions affecting strategies to bring about sustainable regional development. Part Two extends the discussion to include the two lead projects undertaken in the Pyhrn-Eisenwurzen region of Austria— the “Kalkalpen National Park” and the State Exhibition entitled “Land of the Hammers”. Part Three draws on the product-cycle model in an attempt to identify potential breaks with the trends of development found in Pyhrn-Eisenwurzen. The article concludes by presenting some general conclusions regarding the status and prospects of a policy of sustainable regional development in Europe.

Section (typography)

10.1007/bf03185186

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NNNLO determination of the bottom-quark mass from non-relativistic sum rules

Andreas Maier Martin Beneke Jan Piclum Thomas Rauh

The mass of the bottom quark can be determined with high precision from moments of the pair-production cross section σ (e + e -→ b b) near threshold.We present the first complete NNNLO determination from non-relativistic sum rules, obtaining a bottom-quark mass of m PS b (2 GeV) = 4.532 +0.013 -0.039 GeV in the potential-subtracted scheme.For the mass in the MS scheme we find m MS b (m MS b ) = 4.203 +0.016 -0.034 GeV using the recently computed four-loop correction to the scheme conversion.

Pair production

10.22323/1.235.0035

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Enhancing Cross-Modality Synthesis: Subvolume Merging for MRI-to-CT Conversion

arXiv (Cornell University) (2024)

Fuxin Fan Jingna Qiu Yixing Huang Andreas Maier

Providing more precise tissue attenuation information, synthetic computed tomography (sCT) generated from magnetic resonance imaging (MRI) contributes to improved radiation therapy treatment planning. In our study, we employ the advanced SwinUNETR framework for synthesizing CT from MRI images. Additionally, we introduce a three-dimensional subvolume merging technique in the prediction process. By selecting an optimal overlap percentage for adjacent subvolumes, stitching artifacts are effectively mitigated, leading to a decrease in the mean absolute error (MAE) between sCT and the labels from 52.65 HU to 47.75 HU. Furthermore, implementing a weight function with a gamma value of 0.9 results in the lowest MAE within the same overlap area. By setting the overlap percentage between 50% and 70%, we achieve a balance between image quality and computational efficiency.

Modality (human–computer interaction)

10.48550/arxiv.2409.05982

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Quantum-enhanced quantum Monte Carlo: an industrial view

arXiv (Cornell University) (2023)

Maximilian Amsler Peter Deglmann Matthias Degroote Michael P. Kaicher Matthew Kiser

In this work, we test a recently developed method to enhance classical auxiliary-field quantum Monte Carlo (AFQMC) calculations with quantum computers against examples from chemistry and material science, representatives of classes of industry-relevant systems. As molecular test cases, we calculate the energy curve of H4 and relative energies of ozone and singlet molecular oxygen with respect to triplet molecular oxygen, which are industrially relevant in organic oxidation reactions. We find that trial wave functions beyond single Slater determinants improve the performance of AFQMC and allow to generate energies close to chemical accuracy compared to full configuration interaction (FCI) or experimental results. As a representative for material science we study a quasi-1D Fermi-Hubbard model derived from CuBr2, a compound displaying electronic structure properties analogous to cuprates. We find that trial wave functions with both, significantly larger fidelities and lower energies over a Hartree-Fock solution, do not necessarily lead to better AFQMC results.

Full configuration interaction

Quantum Chemistry

10.48550/arxiv.2301.11838

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Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report

arXiv (Cornell University) (2018)

J. Bendavid Fabrizio Caola V. Ciulli Robert Harlander Gudrun Heinrich

This Report summarizes the proceedings of the 2017 Les Houches workshop on Physics at TeV Colliders. Session 1 dealt with (I) new developments relevant for high precision Standard Model calculations, (II) theoretical uncertainties and dataset dependence of parton distribution functions, (III) new developments in jet substructure techniques, (IV) issues in the theoretical description of the production of Standard Model Higgs bosons and how to relate experimental measurements, (V) phenomenological studies essential for comparing LHC data from Run II with theoretical predictions and projections for future measurements, and (VI) new developments in Monte Carlo event generators.

10.48550/arxiv.1803.07977

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Event Generators for High-Energy Physics Experiments

arXiv (Cornell University) (2022)

J. M. Campbell M. Diefenthaler T. J. Hobbs Stefan Höche Joshua Isaacson

We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of active development, and opportunities for future improvements. Particular emphasis is given to physics models and algorithms that are employed across a variety of experiments. These common themes in event generator development lead to a more comprehensive understanding of physics at the highest energies and intensities, and allow models to be tested against a wealth of data that have been accumulated over the past decades. A cohesive approach to event generator development will allow these models to be further improved and systematic uncertainties to be reduced, directly contributing to future experimental success. Event generators are part of a much larger ecosystem of computational tools. They typically involve a number of unknown model parameters that must be tuned to experimental data, while maintaining the integrity of the underlying physics models. Making both these data, and the analyses with which they have been obtained accessible to future users is an essential aspect of open science and data preservation. It ensures the consistency of physics models across a variety of experiments.

Event data

Experimental data

Event generator

10.48550/arxiv.2203.11110

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Citations (45)