Automatic Integral Reduction for Higher Order Perturbative Calculations [PDF]
Journal of High Energy Physics, 2004 Contains fulltext : 60133.pdf (Author’s version preprint ) (Open Access)We present a program for the reduction of large systems of integrals to master integrals.
C Anastasiou, Achilleas Lazopoulos
exaly +10 more sources
An analysis of Bayesian estimates for missing higher orders in perturbative calculations [PDF]
Journal of High Energy Physics, 2021 With current high precision collider data, the reliable estimation of theoretical uncertainties due to missing higher orders (MHOs) in perturbation theory has become a pressing issue for collider phenomenology.
Szafron, Robert +3 more
core +6 more sources
An extensive survey of the estimation of uncertainties from missing higher orders in perturbative calculations [PDF]
Journal of High Energy Physics, 2015 We consider two approaches to estimate and characterise the theoretical uncertainties stemming from the missing higher orders in perturbative calculations in Quantum Chromodynamics: the traditional one based on renormalisation and factorisation scale ...
Guffanti, Alberto +7 more
core +8 more sources
On high-order perturbative calculations at finite density [PDF]
, 2016 We discuss the prospects of performing high-order perturbative calculations in systems characterized by a vanishing temperature but finite density. In particular, we show that the determination of generic Feynman integrals containing fermionic chemical ...
Säppi, Saga +13 more
core +3 more sources
Bayesian uncertainty quantification of perturbative QCD input to the neutron-star equation of state [PDF]
Journal of High Energy Physics, 2023 The equation of state of neutron-star cores can be constrained by requiring a consistent connection to the perturbative Quantum Chromodynamics (QCD) calculations at high densities.
Tyler Gorda +2 more
exaly +2 more sources
Second-Order Perturbation Theory in Continuum Quantum Monte Carlo Calculations [PDF]
Physical Review Research, 2023 We report on the first results for the second-order perturbation theory correction to the ground-state energy of a nuclear many-body system in a continuum quantum Monte Carlo calculation. Second-order (and higher) perturbative corrections are notoriously
Schmidt, Kevin E. +3 more
core +2 more sources
Results and techniques for higher order calculations within the gradient-flow formalism [PDF]
Journal of High Energy Physics, 2019 We describe in detail the implementation of a systematic perturbative approach to observables in the QCD gradient-flow formalism. This includes a collection of all relevant Feynman rules of the five-dimensional field theory and the composite operators ...
Lange, Fabian +4 more
core +3 more sources
On the Higher-Order Effects in Target Single Ionization by Bare Ions in the Perturbative Regime [PDF]
, 2003 We consider hydrogen and helium ionization with emission of soft electrons in high-velocity collisions with bare ions in the perturbative regime |Zp|/vp < 0.1, where Zp is the projectile charge and vp the collision velocity.
Najjari, B., Voitkiv, A., Ullrich, J.
core +3 more sources
Nucleon and nuclear structure functions with nonperturbative and higher order perturbative QCD effects [PDF]
Physical Review D, 2019 We have studied the nucleon structure functions FEMiN(x,Q2); i=1,2, by including contributions due to the higher order perturbative QCD effect up to NNLO and the non-perturbative effects due to the kinematical and dynamical higher twist (HT) effects. The
Singh, S. K. +4 more
core +3 more sources
Perturbative calculations of gravitational form factors at large momentum transfer [PDF]
Journal of High Energy Physics, 2022 We perform a perturbative QCD analysis of the gravitational form factors (GFFs) of nucleon at large momentum transfer. We derive the explicit factorization formula of the GFFs in terms of twist-3 and twist-4 light-cone distribution amplitudes of nucleon.
Xuan-Bo Tong, Jian-Ping Ma, Feng Yuan
exaly +2 more sources