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CERN Document Server 12 records found  1 - 10próximo  jump to record: Search took 1.42 seconds. 
1.
Flow between extremal one-point energy correlators in QCD / Riembau, Marc (CERN ; EPFL, Lausanne, LPTP) ; Son, Minho (KAIST, Taejon)
The energy density generated by a vector current is characterized by a single parameter $a_{\mathcal{E}}$ bounded by unitarity to $-1/2 \leq a_{\mathcal{E}} \leq 1$, with extremal values saturated by free theories of different matter content. [...]
CERN-TH-2025-175 ; arXiv:2509.02669. - 8.
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 Boundaries of Universal theories / Riembau, Marc (speaker) (CERN)
2025 - 3109. TH institutes; Positivity, Amplitudes, and Phenomenology External links: Talk details; Event details In : Positivity, Amplitudes, and Phenomenology
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3.
Precise Extraction of <math display="inline"><mrow><msub><mrow><mi>α</mi></mrow><mrow><mi>em</mi></mrow></msub><mo stretchy="false">(</mo><msubsup><mrow><mi>m</mi></mrow><mrow><mi>Z</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo stretchy="false">)</mo></mrow></math> at the Tera-<math display="inline"><mi>Z</mi></math> Stage of a Future Circular Collider / Riembau, Marc (CERN)
The current projected sensitivity on the electromagnetic coupling $\alpha_\textit{em}(m_Z^2)$ represents a bottleneck for the precision electroweak program at FCC-ee. We propose a novel methodology to extract this coupling directly from $Z$-pole data. [...]
arXiv:2501.05508; CERN-TH-2025-005.- 2025-06-05 - 7 p. - Published in : Phys. Rev. Lett. 134 (2025) 221802 Fulltext: 2501.05508 - PDF; document - PDF;
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4.
One-point correlators of conserved and nonconserved charges in QCD / Riembau, Marc (CERN) ; Son, Minho (KAIST, Taejon)
One-point correlators of conserved charges are argued to be perturbatively IR safe in QCD, which includes not only the density of energy, but also those of electric charge, isospin and baryon number. Theoretical and phenomenological aspects of the density matrix of one-point correlators are discussed in the context of the states produced by a chiral current, as in the decay of a polarized electroweak boson. [...]
arXiv:2407.12082; CERN-TH-2024-113.- 2025-01-01 - 10 p. - Published in : Phys. Rev. D 111 (2025) 014004 Fulltext: 2407.12082 - PDF; Publication - PDF;
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5.
Recursion for Wilson-line Form Factors / Cohen, Timothy (CERN ; EPFL, Lausanne, LPTP ; Oregon U.) ; Riembau, Marc (CERN)
Matrix elements of Wilson-line dressed operators play a central role in the factorization of soft and collinear modes in gauge theories. When expressed using spinor helicity variables, these so-called form factors admit a classification starting from a Maximally Helicity Violating configuration, in close analogy with gauge theory amplitudes. [...]
arXiv:2406.03540; CERN-TH-2024-069.- 2024-10-17 - 28 p. - Published in : JHEP 2410 (2024) 132 Fulltext: 2406.03540 - PDF; document - PDF;
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6.
Boundaries of Universal Theories / McCullough, Matthew (CERN) ; Riembau, Marc (CERN) ; Ricci, Lorenzo (Maryland U.)
Universal theories are a broad class of well-motivated microscopic dynamics of the electroweak sector that go beyond the Standard Model description. The long distance physics is described by electroweak parameters which correspond to local operators in the Effective Field Theory. [...]
arXiv:2312.03834; CERN-TH-2023-231.- 2025-01-01 - 15 p. - Published in : Phys. Rev. D 111 (2025) 015031 Fulltext: PDF;
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Positivity constraints (20'+5') / Riembau Saperas, Marc (speaker) (CERN)
2023 - 1462. Open meetings; 6th General Meeting of the LHC EFT Working Group External links: Talk details; Event details In : 6th General Meeting of the LHC EFT Working Group
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8.
Full Unitarity and the Moments of Scattering Amplitudes / Riembau, Marc (CERN)
We study the impact of full unitarity on the moment structure of forward scattering amplitudes. [...]
arXiv:2212.14056 ; CERN-TH-2022-210. - 8 p.
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9.
IR side of positivity bounds / Bellazzini, Brando (IPhT, Saclay ; EPFL, Lausanne, LPTP ; CERN) ; Riembau, Marc (EPFL, Lausanne, LPTP) ; Riva, Francesco (Geneva U., Dept. Theor. Phys.)
We show how calculable IR loop effects impact positivity bounds in Effective Field Theories with causal and unitary UV completions. We identify infrared singularities which appear in dispersion relations at $|t|\lesssim m^2$. [...]
arXiv:2112.12561.- 2022-11-10 - 11 p. - Published in : Phys. Rev. D 106 (2022) 105008 Fulltext: 2112.12561 - PDF; Publication - PDF;
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10.
Positive Moments for Scattering Amplitudes / Bellazzini, Brando (IPhT, Saclay ; CERN) ; Elias Miró, Joan (ICTP, Trieste) ; Rattazzi, Riccardo (EPFL, Lausanne, LPTP) ; Riembau, Marc (EPFL, Lausanne, LPTP ; Geneva U., Dept. Theor. Phys.) ; Riva, Francesco (Geneva U., Dept. Theor. Phys.)
We find the complete set of conditions satisfied by the forward $2\to2$ scattering amplitude in unitarity and causal theories. These are based on an infinite set of energy dependent quantities -- the arcs -- which are dispersively expressed as moments of a positive measure defined at (arbitrarily) higher energies. [...]
arXiv:2011.00037.- 2021-08-01 - 17 p. - Published in : Phys. Rev. D 104 (2021) 036006 Fulltext: PDF; Fulltext from publisher: PDF;
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