Results 21 to 30 of about 17,630 (246)
Journal of High Energy Physics, 2021 The renormalization constant Z J of the flavor-singlet axial-vector current with a non-anticommuting γ 5 in dimensional regularization is determined to order α s 3 $$ {\alpha}_s^3 $$ in QCD with massless quarks.
Taushif Ahmed, Long Chen, Michał Czakon
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Master integrals for bipartite cuts of three-loop photon self energy
Journal of High Energy Physics, 2021 We calculate the master integrals for bipartite cuts of the three-loop propagator QED diagrams. These master integrals determine the spectral density of the photon self energy.
R. N. Lee, A. I. Onishchenko
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Efficiency improvements for the numerical computation of NLO corrections [PDF]
Journal of High Energy Physics, 2012 In this paper we discuss techniques, which lead to a significant improvement of the efficiency of the Monte Carlo integration, when one-loop QCD amplitudes are calculated numerically with the help of the subtraction method and contour deformation. The techniques discussed are: holomorphic and non-holomorphic division into sub-channels, optimisation of ...
Becker, Sebastian +2 more
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Journal of High Energy Physics, 2020 We consider the on-shell mass and wave function renormalization constants Z m OS $$ {Z}_m^{\mathrm{OS}} $$ and Z 2 OS $$ {Z}_2^{\mathrm{OS}} $$ up to three-loop order allowing for a second non-zero quark mass.
Matteo Fael +2 more
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Journal of High Energy Physics, 2017 We compute the two-loop master integrals required for the leading QCD corrections to the interaction vertex of a massive neutral boson X 0, e.g. H, Z or γ∗, with a pair of W bosons, mediated by a SU(2) L quark doublet composed of one massive and one ...
Stefano Di Vita +3 more
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Functional reduction of Feynman integrals
Journal of High Energy Physics, 2019 A method for reducing Feynman integrals, depending on several kinematic variables and masses, to a combination of integrals with fewer variables is proposed. The method is based on iterative application of functional equations proposed by the author. The
O. V. Tarasov
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Resummed photon spectrum from dark matter annihilation for intermediate and narrow energy resolution
Journal of High Energy Physics, 2019 The annihilation cross section of weakly interacting TeV scale dark matter particles χ 0 into photons is affected by large quantum corrections due to electroweak Sudakov logarithms and the Sommerfeld effect. We extend our previous work on the resummation
M. Beneke +4 more
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Journal of High Energy Physics, 2020 We consider QCD corrections to two loops for the polarized amplitudes of q q ¯ $$ q\overline{q} $$ → Z + Higgs boson. First we show how the polarized amplitudes of b b ¯ $$ b\overline{b} $$ → Zh associated with a non-vanishing b-quark Yukawa coupling and
Taushif Ahmed +3 more
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Precise yield of high-energy photons from Higgsino dark matter annihilation
Journal of High Energy Physics, 2020 The impact of electroweak Sudakov logarithms on the endpoint of the photon spectrum for wino dark matter annihilation was studied intensively over the last several years. In this work, we extend these results to Higgsino dark matter χ 1 0 $$ {\chi}_1^0 $$
M. Beneke +3 more
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