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CERN Document Server 13 ჩანაწერია ნაპოვნი  1 - 10შემდეგი  ჩანაწერთან გადასვლა: ძიებას დასჭირდა 1.31 წამი. 
1.
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;
2.
Gravitational Causality and the Self-Stress of Photons / Bellazzini, Brando (IPhT, Saclay ; CERN) ; Isabella, Giulia (IPhT, Saclay ; IJCLab, Orsay) ; Lewandowski, Matthew (Northwestern U.) ; Sgarlata, Francesco (Cornell U., LEPP)
We study causality in gravitational systems beyond the classical limit. Using on-shell methods, we consider the one-loop corrections from charged particles to the photon energy-momentum tensor - the self-stress - that controls the quantum interaction between two on-shell photons and one off-shell graviton. [...]
arXiv:2108.05896.- 2022-05-24 - 36 p. - Published in : JHEP 2205 (2022) 154 Fulltext: 2108.05896 - PDF; document - PDF;
3.
Gravitational Causality and the Self-Stress of Photons / Bellazzini, Brando ; Isabella, Giulia ; Lewandowski, Matthew ; Serra, Javi ; Sgarlata, Francesco
We study causality in gravitational systems beyond the classical limit. [...]
CERN-TH-2021-029.
- 2021. - 29.
4.
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;
5.
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
6.
Beyond Positivity Bounds and the Fate of Massive Gravity / Bellazzini, Brando (IPhT, Saclay ; Padua U.) ; Riva, Francesco (CERN) ; Serra, Javi (CERN) ; Sgarlata, Francesco (INFN, Trieste ; SISSA, Trieste)
We constrain effective field theories by going beyond the familiar positivity bounds that follow from unitarity, analyticity, and crossing symmetry of the scattering amplitudes. As interesting examples, we discuss the implications of the bounds for the Galileon and ghost-free massive gravity. [...]
arXiv:1710.02539; CERN-TH-2017-201.- 2018-04-18 - 7 p. - Published in : Phys. Rev. Lett. 120 (2018) 161101 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
7.
The other effective fermion compositeness / Bellazzini, Brando (IPhT, Saclay ; Padua U.) ; Riva, Francesco (CERN) ; Serra, Javi (CERN) ; Sgarlata, Francesco (SISSA, Trieste)
We discuss the only two viable realizations of fermion compositeness described by a calculable relativistic effective field theory consistent with unitarity, crossing symmetry and analyticity: chiral-compositeness vs goldstino-compositeness. We construct the effective theory of $\mathcal{N}$ Goldstini and show how the Standard Model can emerge from this dynamics. [...]
arXiv:1706.03070; CERN-TH-2017-119.- 2017-11-07 - 32 p. - Published in : JHEP 11 (2017) 020 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
8.
R-axion at colliders / Bellazzini, Brando (IPhT, Saclay ; Padua U.) ; Mariotti, Alberto (Brussels U., IIHE ; Intl. Solvay Inst., Brussels) ; Redigolo, Diego (Tel Aviv U. ; Weizmann Inst.) ; Sala, Filippo (Paris, LPTHE) ; Serra, Javi (CERN)
We study the effective theory of a generic class of hidden sectors where supersymmetry is broken together with an approximate R-symmetry at low energy. The light spectrum contains the gravitino and the pseudo-Nambu-Goldstone boson of the R-symmetry, the R-axion. [...]
arXiv:1702.02152; CERN-TH-2017-032; Saclay-t17/014.- 2017-10-05 - 6 p. - Published in : Phys. Rev. Lett. 119 (2017) 141804 Fulltext: 10.1103_PhysRevLett.119.141804 - PDF; arXiv:1702.02152 - PDF;
9.
Goldstones in Diphotons / Bellazzini, Brando (IPhT, Saclay ; Padua U.) ; Franceschini, Roberto (CERN) ; Sala, Filippo (Paris, LPTHE) ; Serra, Javi (CERN ; Padua U.)
We study the conditions for a new sub-TeV scalar resonance to be observed first in diphotons at the LHC Run-2. We focus on scenarios where the scalar arises either from an internal or spacetime symmetry broken spontaneously, for which the mass is naturally below the cutoff and the low-energy interactions are fixed by the couplings to the broken currents, UV anomalies, and selection rules. [...]
arXiv:1512.05330; CERN-PH-TH-2015-307; CERN-PH-TH-2015-307.- 2016-04-13 - 25 p. - Published in : JHEP 04 (2016) 072 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
10.
Quantum Critical Higgs / Bellazzini, Brando (IPhT, Saclay ; Padua U.) ; Csáki, Csaba (Cornell U., LEPP ; Cornell U., Phys. Dept.) ; Hubisz, Jay (Syracuse U.) ; Lee, Seung J. (Korea Inst. Advanced Study, Seoul ; Korea U.) ; Serra, Javi (CERN) ; Terning, John (UC, Davis)
The appearance of the light Higgs boson at the LHC is difficult to explain, particularly in light of naturalness arguments in quantum field theory. However light scalars can appear in condensed matter systems when parameters (like the amount of doping) are tuned to a critical point. [...]
arXiv:1511.08218; CERN-PH-TH-2015-275; Saclay-t15-206; CERN-PH-TH-2015-275.- Geneva : CERN, 2016-12-14 - 17 p. - Published in : Phys. Rev. X 6 (2016) 041050 Fulltext: arXiv:1511.08218 - PDF; 10.1103_PhysRevX.6.041050 - PDF; External link: Preprint

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