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CERN Document Server 31 notices trouvées  1 - 10suivantfin  aller vers la notice: La recherche a duré 1.52 secondes. 
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No EFT for massive higher spins / Riva, Francesco (speaker)
Massive resonances with spin larger or equal 2 are ubiquitous in physics, but their mass is always larger than their inverse size (the EFT cutoff). I will show that this condition follows from the requirement that the underlying theory be unitary and causal..
2023 - 2029. Conferences, Workshops & Schools; QCD Meets Gravity 2023 External links: Talk details; Event details In : QCD Meets Gravity 2023
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Microscopic Bounds on Macroscopic Theories / Riva, Francesco (speaker)
I will discuss Effective Field Theories that can originate from microscopic unitary theories, and their relation to moment theory. I will discuss the implications for pion physics, as well as showing that massive gravity, theories with isolated massive higher-spin particles, and theories with very irrelevant interactions, don’t posses healthy UV completions..
2023 - 4128. Theory Colloquia External link: Event details In : Microscopic Bounds on Macroscopic Theories
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Explaining Nonlinearities in Black Hole Ringdowns from Symmetries / Kehagias, Alex (Natl. Tech. U., Athens ; CERN) ; Perrone, Davide (Geneva U.) ; Riotto, Antonio (Geneva U.) ; Riva, Francesco (Geneva U.)
It has been recently pointed out that nonlinear effects are necessary to model the ringdown stage of the gravitational waveform produced by the merger of two black holes giving rise to a remnant Kerr black hole. We show that this nonlinear behaviour is explained, both on the qualitative and quantitative level, by near-horizon symmetries of the Kerr black hole within the Kerr/CFT correspondence..
arXiv:2301.09345.- 2023-07-10 - 5 p. - Published in : Phys. Rev. D 108 (2023) L021501 Fulltext: PDF;
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4.
Cornering Large-$N_c$ QCD with Positivity Bounds / Fernandez, Clara (Barcelona, IFAE ; BIST, Barcelona) ; Pomarol, Alex (Barcelona, IFAE ; BIST, Barcelona ; Barcelona, Autonoma U. ; CERN) ; Riva, Francesco (Geneva U., Dept. Theor. Phys.) ; Sciotti, Francesco (Barcelona, IFAE ; BIST, Barcelona)
The simple analytic structure of meson scattering amplitudes in the large-$N_c$ limit, combined with positivity of the spectral density, provides precise predictions on low-energy observables. Building upon previous studies, we explore the allowed regions of chiral Lagrangian parameters and meson couplings to pions. [...]
arXiv:2211.12488.- 2023-06-16 - 39 p. - Published in : JHEP 2306 (2023) 094 Fulltext: 2211.12488 - PDF; document - PDF;
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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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Truncation, validity, uncertainties / Brivio, Ilaria (Heidelberg U. ; Zurich U.) ; Dawson, Sally (Brookhaven) ; de Blas, Jorge (CAFPE, Granada ; Granada U., Theor. Phys. Astrophys. ; CERN) ; Durieux, Gauthier (CERN) ; Petrucciani, Giovanni (CERN) ; Savard, Pierre (Toronto U.) ; Berger, Nicolas (Annecy, LAPP) ; Contino, Roberto (Rome U.) ; Degrande, Céline (Louvain U., CP3) ; Falkowski, Adam (IJCLab, Orsay) et al.
The truncation of the standard-model effective field theory, its validity and the associated uncertainties have been discussed in meetings of the LHC EFT WG. Proposals were made by participants to address these issues. [...]
CERN-LHCEFTWG-2021-002; CERN-LPCC-2022-01; arXiv:2201.04974.- 21 - 8 p. Fulltext: PDF; v2 draft: PDF;
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Positive Moments and Loops / Riva, Francesco (speaker)
2021 - 3470. Conferences & Workshops; Positivity and the Bootstrap External links: Talk details; Event details In : Positivity and the Bootstrap
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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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Positive Moments for Scattering Amplitudes / Bellazzini, Brando ; Miro, Joan Elias ; Rattazzi, Riccardo ; Riembau, Marc ; Riva, Francesco
We find the complete set of conditions satisfied by the forward 2-to-2 scattering amplitude in unitarity and causal theories. [...]
CERN-TH-2020-161. - 2020. - 17.
Full text
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BSM Benchmarks for Effective Field Theories in Higgs and Electroweak Physics / Marzocca, David (INFN Trieste Italy) ; Riva, Francesco (Universite de Geneve (CH)) ; Criado, J (CAFPE Granada (Spain)) ; Dawson, S (BNL (US)) ; de Blas Mateo, Jorge (Universita e INFN, Padova (IT) and Durham University (UK)) ; Henning, Brian Quinn (CERN) ; Liu, D (Argonnne (US)) ; Low, I (Argonne (US)) ; Murphy, C (BNL (US)) ; Perez-Victoria Moreno De Barreda, Manuel Maria (Universidad de Granada (ES)) et al.
Effective Field Theories (EFTs) capture effects from heavy dynamics at low en- ergy and represent an essential ingredient in the context of Standard Model (SM) precision tests. This document gathers a number of relevant scenarios for heavy physics beyond the SM and presents explicit expressions for the Wilson coeffi- cients in their low-energy EFT. [...]
LHCHXSWG-2019-006.- Geneva : CERN, 2019 LHCHXSWG-2019-006: PDF;
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11 Riva, F.
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