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Regge poles and cuts and the Lipatov vertex
/ Abreu, Samuel (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Falcioni, Giulio (U. Edinburgh, Higgs Ctr. Theor. Phys. ; CERN ; INFN, Turin) ; Gardi, Einan (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Milloy, Calum (Zurich U.) ; Vernazza, Leonardo (Zurich U.)
Scattering amplitudes in the high-energy limit can be described in terms of their singularity structure in the complex angular momentum plane, consisting of Regge poles and cuts. In QCD, gluon Reggeization has long been understood as a manifestation of a Regge pole, but until recently Reggeization violation remained largely obscure. [...]
arXiv:2412.20577.-
2024-09-17 - 17 p.
- Published in : PoS: LL2024 (2024) , pp. 085
Fulltext: 2412.20577 - PDF; document - PDF;
In : 17th Loops and Legs in Quantum Field Theory (LL 2024), Wittenberg, Germany, 14 - 19 Apr 2024, pp.085
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Four-loop two-mass tadpoles and the $\rho$ parameter
/ Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Behring, Arnd (CERN) ; McLeod, Andrew J. (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Page, Ben (CERN ; Gent U.)
We calculate four-loop QCD corrections to the electroweak $\rho$ parameter with a non-vanishing $b$ quark mass. At three loops, it was observed that elliptic integrals contribute to this observable. [...]
arXiv:2407.21700; CERN-TH-2024-129.-
2024-09-17 - 12 p.
- Published in : PoS: LL2024 (2024) , pp. 008
Fulltext: 2407.21700 - PDF; document - PDF;
In : 17th Loops and Legs in Quantum Field Theory (LL 2024), Wittenberg, Germany, 14 - 19 Apr 2024, pp.008
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All Two-Loop Feynman Integrals for Five-Point One-Mass Scattering
/ Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Chicherin, Dmitry (Annecy, LAPTH) ; Ita, Harald (PSI, Villigen ; Zurich U.) ; Page, Ben (CERN) ; Sotnikov, Vasily (Zurich U. ; Michigan State U.) ; Tschernow, Wladimir (Freiburg U.) ; Zoia, Simone (INFN, Turin)
We compute the complete set of two-loop master integrals for the scattering of four massless particles and a massive one. Our results are ready for phenomenological applications, removing a major obstacle to the computation of complete next-to-next-to-leading order (NNLO) QCD corrections to processes such as the production of a $H/Z/W$ boson in association with two jets at the LHC. [...]
arXiv:2306.15431.-
2024-04-01 - 7 p.
- Published in : Phys. Rev. Lett. 132 (2024) 141601
Fulltext: 2306.15431 - PDF; Publication - PDF;
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Two-Loop QCD Corrections for Three-Photon Production at Hadron Colliders
/ Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; De Laurentis, Giuseppe (PSI, Villigen) ; Ita, Harald (PSI, Villigen ; Zurich U.) ; Klinkert, Maximillian (Freiburg U.) ; Page, Ben (CERN) ; Sotnikov, Vasily (Zurich U. ; Michigan State U.)
We complete the computation of the two-loop helicity amplitudes for the production of three photons at hadron colliders, including all contributions beyond the leading-color approximation. We reconstruct the analytic form of the amplitudes from numerical finite-field samples obtained with the numerical unitarity method. [...]
arXiv:2305.17056; CERN-TH-2023-090; PSI-PR-23-16; ZU-TH 23/23.-
2023-10-12 - 37 p.
- Published in : SciPost Phys. 15 (2023) 157
Fulltext: document - PDF; 2305.17056 - PDF; Publication - PDF;
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Two-loop form factors for pseudo-scalar quarkonium production and decay
/ Abreu, Samuel (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Becchetti, Matteo (INFN, Turin) ; Duhr, Claude (U. Bonn, Phys. Inst., BCTP) ; Ozcelik, Melih A. (IJCLab, Orsay ; Karlsruhe U., TTP)
We present the analytic expressions for the two-loop form factors for the production or decay of pseudo-scalar quarkonia, in a scheme where the quarks are produced at threshold. We consider the two-loop amplitude for the process $\gamma \gamma \leftrightarrow {^1S_0^{[1]}}$, that was previously known only numerically, as well as for the processes $gg \leftrightarrow {^1S_0^{[1]}}$, $\gamma g \leftrightarrow {^1S_0^{[8]}}$ and $gg \leftrightarrow {^1S_0^{[8]}}$, which have not been computed before. [...]
arXiv:2211.08838; BONN-TH-2022-23; CERN-TH-2022-187; TTP22-068.-
2023-02-27 - 37 p.
- Published in : JHEP 2302 (2023) 250
Fulltext: document - PDF; 2211.08838 - PDF;
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The Diagrammatic Coaction
/ Gardi, Einan (Edinburgh U.) ; Abreu, Samuel (CERN ; Edinburgh U.) ; Britto, Ruth (Trinity Coll., Dublin) ; Duhr, Claude (Bonn U.) ; Matthew, James (Edinburgh U.)
The diagrammatic coaction underpins the analytic structure of Feynman integrals, their cuts and the differential equations they admit. The coaction maps any diagram into a tensor product of its pinches and cuts. [...]
arXiv:2207.07843; CERN-TH-2022-122; BONN-TH-2022-18.-
2022-10-20 - 19 p.
- Published in : PoS LL2022 (2022) 015
Fulltext: 2207.07843 - PDF; document - PDF;
In : 16th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theory 2022, Ettal, Germany, 25 - 30 Apr 2022, pp.015
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