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CERN Document Server 14 notices trouvées  1 - 10suivant  aller vers la notice: La recherche a duré 1.46 secondes. 
1.
Planar Six-Point Feynman Integrals for Four-Dimensional Gauge Theories / Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Monni, Pier Francesco (CERN) ; Page, Ben (Gent U.) ; Usovitsch, Johann (CERN ; Humboldt U., Berlin, Inst. Math. ; Humboldt U., Berlin)
We compute all planar two-loop six-point Feynman integrals entering scattering observables in massless gauge theories such as QCD. [...]
CERN-TH-2024-221 ; HU-EP-24/40-RTG ; arXiv:2412.19884. - 32.
Fulltext
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2.
Towards the next Kira release / Lange, Fabian (Zurich U. ; PSI, Villigen) ; Usovitsch, Johann (CERN) ; Wu, Zihao (HIAS, UCAS, Hangzhou)
The reduction of Feynman integrals to a basis of master integrals plays a crucial role for many high-precision calculations and Kira is one of the leading tools for this task. In these proceedings we discuss some of the new features and improvements currently being developed for the next release..
arXiv:2407.01395; ZU-TH 32/24; PSI-PR-24-14; CERN-TH-2024-096.- 2024-09-17 - 13 p. - Published in : PoS LL2024 (2024) 070 Fulltext: document - PDF; 2407.01395 - PDF;
In : 17th Loops and Legs in Quantum Field Theory (LL 2024), Wittenberg, Germany, 14 - 19 Apr 2024, pp.070
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3.
Conservative Black Hole Scattering at Fifth Post-Minkowskian and First Self-Force Order / Driesse, Mathias (Humboldt U., Berlin) ; Jakobsen, Gustav Uhre (Humboldt U., Berlin ; Potsdam, Max Planck Inst.) ; Mogull, Gustav (Humboldt U., Berlin ; Potsdam, Max Planck Inst.) ; Plefka, Jan (Humboldt U., Berlin) ; Benjamin Sauer (Humboldt U., Berlin) ; Usovitsch, Johann (CERN)
We compute the 5PM order contributions to the scattering angle and impulse of classical black hole scattering in the conservative sector at first self-force order (1SF) using the worldline quantum field theory formalism. This challenging four-loop computation required the use of advanced integration-by-parts and differential equation technology implemented on high-performance computing systems. [...]
arXiv:2403.07781; HU-EP-24/08-RTG; CERN-TH-2024-032.- 2024-06-13 - 12 p. - Published in : Phys. Rev. Lett. 132 (2024) 241402 Fulltext: 2403.07781 - PDF; Publication - PDF;
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4.
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Improved Integral Reduction with Kira / Usovitsch, Johann (speaker) (CERN)
The focus will be on improved integral reduction with the Kira program. I will present a seeding algorithm that can improve the reduction time by more than one order of magnitude compared to the current algorithm in Kira. [...]
2023 - 1878. Conferences, Workshops & Schools; QCD Meets Gravity 2023 External links: Talk details; Event details In : QCD Meets Gravity 2023
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5.
The Higgs-gluon form factor at three loops in QCD with three mass scales / Niggetiedt, Marco (Garching, Max Planck Inst.) ; Usovitsch, Johann (CERN)
We report on the complete three-loop corrections to the Higgs-gluon form factor in QCD. While previous calculations are based on QCD with a single heavy quark of arbitrary mass, we extend the study to QCD involving two different massive quark flavors. [...]
arXiv:2312.05297; MPP-2023-280; CERN-TH-2023-236.- 2024-02-14 - 22 p. - Published in : JHEP 2402 (2024) 087 Fulltext: document - PDF; 2312.05297 - PDF;
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6.
Third order correction to semileptonic $b\to u$ decay: fermionic contributions / Fael, Matteo (CERN) ; Usovitsch, Johann (CERN)
We present the QCD corrections of order $\alpha_s^3$ to the decay rate of $b \to u \ell \bar \nu_\ell$, with $\ell = e,\mu$, originating from diagrams with closed fermion loops and neglecting the mass of the up quark. Our calculation relies on integration-by-parts reduction of Feynman integrals with one propagator raised to a symbolic power in Kira and the numerical evaluation of master integrals with AMFlow. [...]
arXiv:2310.03685; CERN-TH-2023-181.- 2023-12-01 - 5 p. - Published in : Phys. Rev. D 108 (2023) 114026 Fulltext: 2310.03685 - PDF; Publication - PDF;
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7.
Kira and the block-triangular form / Usovitsch, Johann (CERN)
For many state-of-the-art cross section computations the standard approach of Feynman integral reduction with the Laporta algorithm is the main bottleneck of the computation. We study a new approach of Feynman integral reduction by introducing a block-triangular form, which is a smaller system of equations compared to the system of equations which is generated with the Laporta algorithm. [...]
2022 - 8 p. - Published in : PoS LL2022 (2022) 071 Fulltext: PDF;
In : 16th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theory 2022, Ettal, Germany, 25 - 30 Apr 2022, pp.071
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8.
Feynman parameter integration through differential equations / Hidding, Martijn (Uppsala U.) ; Usovitsch, Johann (CERN)
We present a new method for numerically computing generic multi-loop Feynman integrals. The method relies on an iterative application of Feynman's trick for combining two propagators. [...]
arXiv:2206.14790; UUITP-31/22; CERN-TH-2022-111.- 2023-08-01 - 11 p. - Published in : Phys. Rev. D 108 (2023) 036024 Fulltext: Publication - PDF; 2206.14790 - PDF;
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9.
Evaluation of multiloop multiscale Feynman integrals for precision physics / Dubovyk, Ievgen (Silesia U.) ; Freitas, Ayres (Pittsburgh U.) ; Gluza, Janusz (Silesia U.) ; Grzanka, Krzysztof (Silesia U.) ; Hidding, Martijn (Uppsala U.) ; Usovitsch, Johann (CERN)
Modern particle physics is increasingly becoming a precision science that relies on advanced theoretical predictions for the analysis and interpretation of experimental results. The planned physics program at the LHC and future colliders will require three-loop electroweak and mixed electroweak-QCD corrections to single-particle production and decay processes and two-loop electroweak corrections to pair production processes, all of which are beyond the reach of existing analytical and numerical techniques in their current form. [...]
arXiv:2201.02576; CERN-TH-2021-230; UUITP-66/21.- 2022-12-01 - 7 p. - Published in : Phys. Rev. D 106 (2022) L111301 Fulltext: 2201.02576 - PDF; Publication - PDF;
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10.
Developments since Kira 2.0 / Lange, Fabian (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IAP) ; Maierhöfer, Philipp (Freiburg U.) ; Usovitsch, Johann (CERN)
Last year we released version 2.0 of the Feynman integral reduction program Kira. In this contribution we first report on changes and new features since then and, secondly, on new features for upcoming releases..
arXiv:2111.01045; CERN-TH-2021-178 ; TTP21-045; P3H-21-087; CERN-TH-2021-178; TTP21-045; P3H-21-087.- 2022-06-21 - 6 p. - Published in : SciPost Phys. Proc. 7 (2022) 017 Fulltext: 2111.01045 - PDF; document - PDF;
In : 15th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology AND LoopFest XIX: Workshop on Radiative Corrections for the LHC and Future Colliders (Radcor and LoopFest 2021), Tallahassee, FL, United States, 16 - 21 May 2021, pp.017
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CERN Document Server : 14 notices trouvées   1 - 10suivant  aller vers la notice:
Voir aussi: noms d'auteurs similaires
3 Usovitsch, J
20 Usovitsch, Johann
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