Anomalous Sudakov form factors

Ciafaloni, M.; Ciafaloni, Paolo; Comelli, Denis

doi:10.1007/jhep03(2010)072

Cited by 10 publications

(13 citation statements)

References 28 publications

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“…The analysis of the Infrared virtual corrections to gauge non invariant amplitudes, i.e. amplitudes proportionals to the higgs vev, has been recently performed in[22].…”

mentioning

confidence: 99%

Weak corrections are relevant for dark matter indirect detection

Ciafaloni

Comelli

Riotto

et al. 2011

J. Cosmol. Astropart. Phys.

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359

438

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The computation of the energy spectra of Standard Model particles originated from the annihilation/decay of dark matter particles is of primary importance in indirect searches of dark matter. We compute how the inclusion of electroweak corrections significantly alter such spectra when the mass M of dark matter particles is larger than the electroweak scale: soft electroweak gauge bosons are copiously radiated opening new channels in the final states which otherwise would be forbidden if such corrections are neglected. All stable particles are therefore present in the final spectrum, independently of the primary channel of dark matter annihilation/decay. Such corrections are model-independent.

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“…The analysis of the Infrared virtual corrections to gauge non invariant amplitudes, i.e. amplitudes proportionals to the higgs vev, has been recently performed in[22].…”

mentioning

confidence: 99%

Weak corrections are relevant for dark matter indirect detection

Ciafaloni

Comelli

Riotto

et al. 2011

J. Cosmol. Astropart. Phys.

Self Cite

359

438

View full text Add to dashboard Cite

show abstract

“…It arises in a way that is completely analogous to the presence of large double-logarithms in the matrix elements of electroweak currents, see e.g. [17][18][19], which are usually called electroweak Sudakov doublelogarithms in analogy to the original QED Sudakov factors that are associated to the vanishing photon mass.…”

Section: Ir-divergences and Sudakov Double-logarithmsmentioning

confidence: 99%

Gravitational Causality and the Self-Stress of Photons

Bellazzini,

Isabella,

Lewandowski

et al. 2021

Preprint

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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 energymomentum tensor -the self-stress-that controls the quantum interaction between two on-shell photons and one off-shell graviton. The self-stress determines in turn the phase shift and time delay in the scattering of photons against a spectator particle of any spin in the eikonal regime. We show that the sign of the β-function associated to the running gauge coupling is related to the sign of time delay at small impact parameter. Our results show that, at first post-Minkowskian order, asymptotic causality, where the time delay experienced by any particle must be positive, is respected quantum mechanically. Contrasted with asymptotic causality, we explore a local notion of causality, where the time delay is longer than the one of gravitons, which is seemingly violated by quantum effects.

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“…As DGLAP evolution is derivable from perturbative methods, it is possible to decompose them into helicity components as done, for example, in refs. [91][92][93][94][95]. Alternatively, one can pragmatically bypass a numerical extraction of f k λ /p (ξ, µ f ) by noting that massless SU(3) c ⊗U(1) QED is a parity-invariant theory.…”

Section: Jhep04(2020)082mentioning

confidence: 99%

Automated predictions from polarized matrix elements

Franzosi

Mattelaer

Ruiz

et al. 2020

J. High Energ. Phys.

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The anticipated experimental resolution and data cache of the High Luminosity Large Hadron Collider will enable precision investigations of polarization in multiboson processes. This includes, for the first time, vector boson scattering. To facilitate such studies, we report the automation of polarized matrix element computations in the publicly available Monte Carlo tool suite, MadGraph5 aMC@NLO. This enables scattering and decay simulations involving helicity-polarized asymptotic or intermediate states, preserving both spin-correlation and off-shell effects. As demonstrations of the method, we investigate the leading order production and decay of polarized weak gauge bosons in the process pp → jjW + λ W − λ , with helicity eigenstates (λ, λ) defined in various reference frames. We consider the Standard Model at both O(α 4) and O(α 2 α 2 s) as well as a benchmark composite Higgs scenario. We report good agreement with polarization studies based on the On-Shell Projection (OSP) technique. Future capabilities are discussed.

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Anomalous Sudakov form factors

Cited by 10 publications

References 28 publications

Weak corrections are relevant for dark matter indirect detection

Weak corrections are relevant for dark matter indirect detection

Gravitational Causality and the Self-Stress of Photons

Automated predictions from polarized matrix elements

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