A5039656997- Particle physics theoretical and experimental studies
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Electromagnetic Scattering and Analysis
- Distributed and Parallel Computing Systems
- Dark Matter and Cosmic Phenomena
- Advanced Data Storage Technologies
- Computational Physics and Python Applications
- International Science and Diplomacy
- Neutrino Physics Research
- Matrix Theory and Algorithms
- Cryptography and Residue Arithmetic
- Mathematical Approximation and Integration
- Algebraic and Geometric Analysis
- Mathematical functions and polynomials
- ICT Impact and Policies
- Atomic and Subatomic Physics Research
- Interconnection Networks and Systems
- Medical Imaging and Analysis
- Electromagnetic Simulation and Numerical Methods
European Organization for Nuclear Research
2017-2021
Max Planck Society
2012-2019
Humboldt-Universität zu Berlin
2018
Michigan State University
2018
UCLouvain
2018
University of Oxford
2018
Max Planck Institute for Physics
2012-2018
University of California, Santa Barbara
2016
University of Zurich
2014-2016
Institute for Physics
2016
We present the calculation of cross section and invariant mass distribution for Higgs boson pair production in gluon fusion at next-to-leading order (NLO) QCD. Top-quark masses are fully taken into account throughout calculation. The virtual two-loop amplitude has been generated using an extension program GoSam supplemented with interface to Reduze integral reduction. occurring integrals have calculated numerically SecDec. Our results, including full top-quark dependence first time, allow us...
We study the effects of exact top quark mass-dependent two-loop corrections to Higgs boson pair production by gluon fusion at LHC and a 100 TeV hadron collider. perform detailed comparison full next-to-leading order result various approximations level differential distributions also analyse non-standard self-coupling scenarios. find that different differ from up 50 percent in relevant distributions. This clearly stresses importance NLO result.
The purely numerical evaluation of multi-loop integrals and amplitudes can be a viable alternative to analytic approaches, in particular the presence several mass scales, provided sufficient accuracy achieved an acceptable amount time. For many integrals, fraction time required perform integration is significant it therefore beneficial have efficient well-implemented methods. With this goal mind, we present new stand-alone integrator based on use (quasi-Monte Carlo) rank-1 shifted lattice...
Abstract Predictions for the Higgs masses are a distinctive feature of supersymmetric extensions Standard Model, where they play crucial role in constraining parameter space. The discovery boson and remarkably precise measurement its mass at LHC have spurred new efforts aimed improving accuracy theoretical predictions models. “ Precision SUSY Mass Calculation Initiative ” (KUTS) was launched 2014 to provide forum discussions between different groups involved these efforts. This report aims...
Results are presented for the momentum-dependent two-loop contributions of $$\mathcal{O}(\alpha _t\alpha _s)$$ to masses and mixing effects in Higgs sector MSSM. They obtained Feynman-diagrammatic approach using a mixed on-shell/ $$\overline{{\mathrm {DR}}}$$ renormalization that can directly be matched onto higher-order corrections included code FeynHiggs. The new diagrams evaluated with program SecDec. combination contribution existing one- scheme leads an improved prediction light MSSM...
Reaching a theoretical accuracy in the prediction of lightest MSSM Higgs-boson mass, M_h, at level current experimental precision requires inclusion momentum-dependent contributions two-loop level. Recently two groups presented QCD corrections to Mh [1,2], using hybrid on-shell--DRbar scheme, with apparently different results. We show that differences can be traced back renormalization top-quark and claim [2] an inconsistency [1] is incorrect. furthermore compare consistently results for M_h...
Higher-order corrections to the MSSM Higgs-boson masses are desirable for accurate predictions currently testable at LHC. By comparing prediction with measured value of discovered Higgs signal, viable parameter regions can be inferred. For an improved theory accuracy, we compute all two-loop involving strong coupling mass spectrum complex parameters. Apart from dependence on coupling, these contributions depend weak and Yukawa couplings, leading terms $$\mathcal {O}{\left( \alpha _s\right)...
A bstract We compute the two-loop massless QCD corrections to four-point amplitude g + → H resulting from effective operator insertions that describe interaction of a Higgs boson with gluons in infinite top quark mass limit. This is an essential ingredient third-order pair production. have implemented our results numerical code can be used for further phenomenological studies.
A bstract We present a sensitivity study on the cubic and quartic self couplings in double Higgs production via gluon fusion at hadron colliders. Considering relevant operators Standard Model Effective Field Theory up to dimension eight, we calculate dominant contributions two-loop level, where first dependence interaction appears. Our approach allows independent variations of two clearly identify terms necessary satisfy gauge invariance obtain UV-finite results order by perturbation theory....
The future 100-km circular collider FCC at CERN is planned to operate in one of its modes as an electron-positron FCC-ee machine. We give overview comparing the theoretical status experimental demands four foreseen operating stages, Z-boson resonance energy physics, called Tera-Z stage for short. will deliver highest integrated luminosities well very small systematic errors a study Standard Model (SM) with unprecedented precision. In fact, allow least more perturbative order quantum field...
The Future Circular Collider (FCC) at CERN, a proposed 100-km circular facility with several colliders in succession, culminates 100 TeV proton-proton collider. It offers vast new domain of exploration particle physics, orders magnitude advances terms Precision, Sensitivity and Energy. implementation plan foresees, as first step, an Electroweak Factory electron-positron This high luminosity facility, operating between 90 365 GeV centre-of-mass energy, will study the heavy particles Standard...
Predictions for the Higgs masses are a distinctive feature of supersymmetric extensions Standard Model, where they play crucial role in constraining parameter space. The discovery boson and remarkably precise measurement its mass at LHC have spurred new efforts aimed improving accuracy theoretical predictions models. "Precision SUSY Mass Calculation Initiative" (KUTS) was launched 2014 to provide forum discussions between different groups involved these efforts. This report aims present...
Loopedia is a new database at loopedia.org for information on Feynman integrals, intended to provide both bibliographic as well results made available by the community. Its bibliometry complementary that of SPIRES or arXiv in sense it admits searching integrals graph-theoretical objects, e.g. its topology.
A bstract An algorithm for the systematic analytical approximation of multi-scale Feynman integrals is presented. The produces algebraic expressions as functions kinematical parameters and mass scales appearing in integrals, allowing fast numerical evaluation. results are valid all regions, both above below thresholds, up to principle arbitrary orders dimensional regulator. scope demonstrated by presenting selected two-loop threepoint four-point with an internal scale that appear amplitudes...
In this thesis, major developments in the publicly available program SecDec are presented, extending numerical evaluation of multi-loop multi-scale integrals from Euclidean to physical kinematics. The power new feature is shown two phenomenological applications. first, results for several massive two-loop four-point functions shown. its second application within leading momentum-dependent corrections neutral $\mathcal{CP}$-even MSSM Higgs-boson masses calculated. included code FeynHiggs.