Results 21 to 30 of about 2,966 (100)
Nuclear uncertainties in the determination of proton PDFs
European Physical Journal C: Particles and Fields, 2019 We show how theoretical uncertainties due to nuclear effects may be incorporated into global fits of proton parton distribution functions (PDFs) that include deep-inelastic scattering and Drell–Yan data on nuclear targets.
Richard D. Ball +2 more
doaj +1 more source
Large gauge effects and the structure of amplitudes
Journal of High Energy Physics, 2023 We show that large gauge transformations modify the structure of momentum conservation leading to non-vanishing three-point amplitudes in a simple toy model of a gravitational wave event.
Andrea Cristofoli +3 more
doaj +1 more source
Infrared singularities of QCD scattering amplitudes in the Regge limit to all orders
Journal of High Energy Physics, 2018 Scattering amplitudes of partons in QCD contain infrared divergences which can be resummed to all orders in terms of an anomalous dimension. Independently, in the limit of high-energy forward scattering, large logarithms of the energy can be resummed ...
Simon Caron-Huot +3 more
doaj +1 more source
One-loop central-emission vertex for two gluons in N $$ \mathcal{N} $$ = 4 super Yang-Mills theory
Journal of High Energy Physics, 2022 A necessary ingredient for extending the BFKL equation to next-to-next-to-leading logarithmic (NNLL) accuracy is the one-loop central emission vertex (CEV) for two gluons which are not strongly ordered in rapidity. Here we consider the one-loop six-gluon
Emmet P. Byrne +4 more
doaj +1 more source
Electromagnetic finite-size effects beyond the point-like approximation [PDF]
EPJ Web of Conferences, 2022 We present a model-independent and relativistic approach to analytically derive electromagnetic finite-size effects beyond the point-like approximation.
Di Carlo Matteo +3 more
doaj +1 more source
Journal of High Energy Physics, 2017 We present results for the decay constants of the D and D s mesons computed in lattice QCD with N f = 2 + 1 dynamical flavours. The simulations are based on RBC/UKQCD’s domain wall ensembles with both physical and unphysical light-quark masses and ...
The RBC/UKQCD collaboration +6 more
doaj +1 more source
Journal of High Energy Physics, 2021 The on-shell matrix elements, or couplings g H H ∗ H 1 γ $$ {g}_{H{H}^{\ast}\left({H}_1\right)\upgamma} $$ , describing the B D q ∗ $$ B{(D)}_q^{\ast } $$ → B(D) q γ and B 1q → B q γ (q = u, d, s) radiative decays, are determined from light-cone sum ...
Ben Pullin, Roman Zwicky
doaj +1 more source
Isospin mass differences of the B, D and K
Journal of High Energy Physics, 2023 We compute the electromagnetic mass difference for the B-, D- and K-mesons using QCD sum rules with double dispersion relations. For the B- and D-mesons we also compute the linear quark mass correction, whereas for the K the standard soft theorems prove ...
Matthew Rowe, Roman Zwicky
doaj +1 more source
Relating amplitude and PDF factorisation through Wilson-line geometries
Journal of High Energy Physics, 2019 We study long-distance singularities governing different physical quantities involving massless partons in perturbative QCD by using factorisation in terms of Wilson-line correlators. By isolating the process-independent hard-collinear singularities from
Giulio Falcioni +2 more
doaj +1 more source
Renormalization of gluonic leading-twist operators in covariant gauges
Journal of High Energy Physics, 2022 We provide the all-loop structure of gauge-variant operators required for the renormalisation of Green’s functions with insertions of twist-two operators in Yang-Mills theory.
Giulio Falcioni, Franz Herzog
doaj +1 more source