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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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Bounds on photon scattering
/ Häring, Kelian (CERN ; Ecole Polytechnique, Lausanne) ; Hebbar, Aditya (Ecole Polytechnique, CPHT ; Ecole Polytechnique, Lausanne) ; Karateev, Denis (U. Geneva (main) ; Ecole Polytechnique, Lausanne) ; Meineri, Marco (U. Geneva (main) ; Ecole Polytechnique, Lausanne) ; Penedones, João (Ecole Polytechnique, Lausanne)
We study 2-to-2 scattering amplitudes of massless spin one particles in $d=4$ space-time dimensions, like real world photons. We define a set of non-perturbative observables (Wilson coefficients) which describe these amplitudes at low energies. [...]
arXiv:2211.05795; CERN-TH-2022-161.-
2024-10-11 - 95 p.
- Published in : JHEP 2410 (2024) 103
Fulltext: 2211.05795 - PDF; document - PDF;
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Parametrized classifiers for optimal EFT sensitivity
/ Chen, Siyu (EPFL, Lausanne, LPTP) ; Glioti, Alfredo (EPFL, Lausanne, LPTP) ; Panico, Giuliano (INFN, Florence ; Florence U.) ; Wulzer, Andrea (EPFL, Lausanne, LPTP ; CERN ; U. Padua, Dept. Phys. Astron.)
We study unbinned multivariate analysis techniques, based on Statistical Learning, for indirect new physics searches at the LHC in the Effective Field Theory framework. We focus in particular on high-energy $ZW$ production with fully leptonic decays, modeled at different degrees of refinement up to NLO in QCD. [...]
arXiv:2007.10356.-
2021-05-27 - 34 p.
- Published in : JHEP 2105 (2021) 247
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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5.
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Hypermagnetogenesis from axion inflation: model-independent estimates
/ Gorbar, E.V. (Taras Shevchenko U. ; BITP, Kiev) ; Schmitz, K. (CERN) ; Sobol, O.O. (Taras Shevchenko U. ; EPFL, Lausanne, LPPC) ; Vilchinskii, S.I. (Taras Shevchenko U. ; Geneva U.)
Axion inflation coupled to the Standard Model (SM) hypercharge gauge sector represents an attractive scenario for the generation of primordial hypermagnetic fields. The description of this scenario is, however, complicated by the Schwinger effect, which gives rise to highly nonlinear dynamics. [...]
arXiv:2111.04712; CERN-TH-2021-185.-
2022-02-15 - 22 p.
- Published in : Phys. Rev. D 105 (2022) 043530
Fulltext: PDF;
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Gravity from quantum mechanics of finite matrices
/ Komatsu, Shota (CERN) ; Martina, Adrien (EPFL, Lausanne, FSL) ; Penedones, João (EPFL, Lausanne, FSL) ; Suchel, Noé (EPFL, Lausanne, FSL ; LPENS, Paris) ; Vuignier, Antoine (EPFL, Lausanne, FSL) ; Zhao, Xiang (EPFL, Lausanne, FSL)
We revisit the Berenstein-Maldacena-Nastase (BMN) conjecture relating M-theory on a PP-wave background and Matrix Quantum Mechanics (MQM) of $N\times N$ matrices. [...]
arXiv:2401.16471.
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70 p.
Fulltext
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Gauge-field production during axion inflation in the gradient expansion formalism
/ Gorbar, E.V. (Taras Shevchenko U. ; BITP, Kiev) ; Schmitz, K. (CERN) ; Sobol, O.O. (Taras Shevchenko U. ; EPFL, Lausanne, LPPC) ; Vilchinskii, S.I. (Taras Shevchenko U. ; EPFL, Lausanne, LPPC)
We study the explosive production of gauge fields during axion inflation in a novel gradient expansion formalism that describes the time evolution of a set of bilinear electromagnetic functions in position space. Based on this formalism, we are able to simultaneously account for two important effects that have thus far been mostly treated in isolation: (i) the backreaction of the produced gauge fields on the evolution of the inflaton field and (ii) the Schwinger pair production of charged particles in the strong gauge-field background. [...]
arXiv:2109.01651; CERN-TH-2021-128.-
2021-12-02 - 24 p.
- Published in : Phys. Rev. D 104 (2021) 123504
Fulltext: 2109.01651 - PDF; PhysRevD.104.123504 - PDF;
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