Article
Physics, Particles & Fields
Stefano Frixione, Bryan R. Webber
Summary: This article discusses how color flows can simplify the computation of matrix elements and enable parton shower Monte Carlos to achieve accuracy beyond leading color. By systematically employing these color flows, tree-level matrix elements and their soft limits can be given in a closed form that does not require any color algebra. Additionally, the study examines how color loops and dipole graphs can help extend the accuracy of Monte Carlos by including subleading-color effects.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Daniel de Florian, Ignacio Fabre, Gudrun Heinrich, Javier Mazzitelli, Ludovic Scyboz
Summary: This study combines NLO predictions with full top-quark mass dependence with approximate NNLO predictions for Higgs-boson pair production in gluon fusion. It examines the impact of anomalous couplings on various observables and provides numerical coefficients for the approximate NNLO cross section as a function of the anomalous couplings at root s = 14TeV.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dhimiter D. Canko, Costas G. Papadopoulos, Nikolaos Syrrakos
Summary: Analytic expressions for three families of planar two-loop five-point Master Integrals with one off-shell leg are presented in terms of polylogarithmic functions, using the Simplified Differential Equations approach. The results are relevant for studying various 2 -> 3 scattering processes at the LHC, particularly for leading-color W + 2 jets production.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Bakul Agarwal, Stephen P. Jones, Andreas von Manteuffel
Summary: This study calculates the two-loop QCD corrections to gg -> ZZ involving a closed top-quark loop using a new method, with the amplitude expressed in terms of finite integrals derived by employing syzygies. Numerical integration results show agreement with previous expansions in asymptotic limits and provide ab initio results for intermediate partonic energies and non-central scattering at higher energies.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Luca Buonocore, Paolo Nason, Francesco Tramontano, Giulia Zanderighi
Summary: This study examines several basic photon and lepton-initiated processes at the LHC, utilizing recently developed photon and lepton parton densities for computation. The comparison of different calculation methods and their application in searching for exotic particles and observing Standard-Model processes are discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Matthias Heller, Andreas von Manteuffel, Robert M. Schabinger, Hubert Spiesberger
Summary: The study focuses on the qq-initiated two-loop electroweak-QCD Drell-Yan scattering amplitude with vanishing light quark and lepton masses using dimensional regularization schemes. It is found that the infrared pole terms of the mixed two-loop amplitude are controlled by a known generalization of the dipole formula, and that exactly the same two-loop polarized hard scattering functions are obtained in both the standard 't Hooft-Veltman-Breitenlohner-Maison gamma(5) scheme and Kreimer's anticommuting gamma(5) scheme.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Fabrizio Caola, Silvia Ferrario Ravasio, Giovanni Limatola, Kirill Melnikov, Paolo Nason
Summary: In this study, we investigate the impact of linear power corrections related to QCD on certain collider observables. By presenting arguments, we conclude that such corrections do not appear in inclusive observables with respect to QCD radiation. Although our study is conducted in a simplified framework, the results can be applied, to some extent, to processes in both lepton and hadron colliders.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Simone Alioli, Alessandro Broggio, Matthew A. Lim
Summary: We study the resummation of the 0-jettiness resolution variable tau(0) for the top-quark pair production process in hadronic collisions. Starting from an effective theory framework, we derive a factorisation formula for this observable and calculate its corrections. By matching with fixed order calculations, we obtain the most accurate prediction for the process.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Jeffrey R. Forshaw, Jack Holguin
Summary: In QCD, coherence violation is an interesting and counter-intuitive phenomenon, almost all observables sensitive to soft radiation at hadron colliders will violate coherence to some degree.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Anatoly Radyushkin, Shuai Zhao
Summary: This study presents one-loop corrections for the newly introduced gluon condensate PDF F(x) and provides the expression for the gg-part of its evolution kernel. By strictly adhering to gauge invariance requirements and utilizing on-shell states, it was discovered that there were terms such as q^2δ(x) found for the ξ = 0 GPD F(x, q^2) at nonzero momentum transfer q. The results did not align with the original attempt of one-loop calculations for gluon states, indicating caution for calculations using matrix elements with virtual external gluons.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Daniele Lombardi, Marius Wiesemann, Giulia Zanderighi
Summary: This study computes the NNLO+PS predictions for W+W- production in hadronic collisions, matching them consistently with parton showers using the MINNLOPS method. By including spin correlations, interferences, and off-shell effects, the evaluation time of the two-loop contribution has been significantly reduced. The results show good agreement with experimental measurements from ATLAS and CMS, highlighting the importance of NNLO corrections and matching to parton showers for an accurate simulation of W+W- events.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Martin Beneke, Philipp Boer, Jan-Niklas Toelstede, K. Keri Vos
Summary: This paper discusses the generalization of the leading-twist light-cone distribution amplitude for light mesons including QED effects and its renormalization group evolution at the strong-interaction scale Lambda(QCD). For charged mesons, there are qualitative differences in scale evolution between QCD and QED-generalized, especially regarding the endpoint behavior. The evolution equation is analytically solved to first order in the electromagnetic coupling alpha(em), which resums large logarithms in QCD while providing numerical estimates for QED corrections to Gegenbauer coefficients and inverse moments relevant to (QED-generalized) factorization theorems for hard exclusive processes.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
C. A. Flett, J. A. Gracey, S. P. Jones, T. Teubner
Summary: We calculate the exclusive electroproduction, gamma*p -> Vp, of heavy quarkonia V to NLO in the collinear factorisation scheme, which has been formally proven for this process, extending the photoproduction phase space of the exclusive heavy quarkonia observable to electroproduction kinematics with an off-shell virtuality Q(2) carried by the photon. This process is relevant for diffractive scattering at HERA and the upcoming EIC, as well as at the proposed LHeC and FCC.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dhimiter D. Canko, Nikolaos Syrrakos
Summary: The article details two resummation methods derived from the Simplified Differential Equations approach applied to a canonical basis of master integrals. The first method facilitates determining boundary conditions by establishing relationships between basis elements, while the second method shows how solutions to a canonical basis with one mass less can be obtained through the x -> 1 limit. Both methods utilize residue matrices for the {0, 1} letters of the canonical differential equation, and are demonstrated through the application to a three-loop ladder-box canonical basis.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Piotr Bargiela, Fabrizio Caola, Andreas von Manteuffel, Lorenzo Tancredi
Summary: This study is of great importance for calculating the NNLO QCD corrections to diphoton production in gluon fusion. The researchers employed a new method to calculate scattering amplitudes, providing accurate and compact analytical results.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Fabrizio Caola, Kirill Melnikov, Raoul Roentsch, Lorenzo Tancredi
Article
Astronomy & Astrophysics
Fabrizio Caola, Kirill Melnikov, Raoul Roentsch, Lorenzo Tancredi
Article
Physics, Particles & Fields
Tom Melia, Paolo Nason, Raoul Rontsch, Giulia Zanderighi
EUROPEAN PHYSICAL JOURNAL C
(2011)
Article
Astronomy & Astrophysics
Tom Melia, Kirill Melnikov, Raoul Roentsch, Giulia Zanderighi
Article
Astronomy & Astrophysics
John Campbell, R. Keith Ellis, Raoul Roentsch
Article
Astronomy & Astrophysics
John M. Campbell, R. Keith Ellis, Elisabetta Furlan, Raoul Roentsch
Article
Physics, Particles & Fields
Tom Melia, Paolo Nason, Raoul Roentsch, Giulia Zanderighi
JOURNAL OF HIGH ENERGY PHYSICS
(2011)
Article
Physics, Particles & Fields
Tom Melia, Kirill Melnikov, Raoul Roentsch, Markus Schulze, Giulia Zanderighi
JOURNAL OF HIGH ENERGY PHYSICS
(2012)
Article
Physics, Particles & Fields
Raoul Roentsch, Markus Schulze
JOURNAL OF HIGH ENERGY PHYSICS
(2014)
Article
Astronomy & Astrophysics
Wojciech Bizon, Fabrizio Caola, Kirill Melnikov, Raoul Rontsch
Summary: We have combined the NNLO QCD description of Higgs boson production with an electroweak vector boson and a similar description of Higgs boson decays into a pair of b quarks, as well as the anomalous couplings that modify the interactions between the Higgs and electroweak vector bosons. The resulting numerical code is a powerful tool for studying these anomalous couplings in the associated Higgs boson production process. By studying the impact of these anomalous couplings on cross sections and differential distributions, we show that with higher QCD precision, smaller anomalous couplings can be probed in regions where the effects of higher-dimensional operators in the Standard Model effective field theory are small and the effective field theory expansion is under control.
Article
Astronomy & Astrophysics
Arnd Behring, Federico Buccioni, Fabrizio Caola, Maximilian Delto, Matthieu Jaquier, Kirill Melnikov, Raoul Rontsch
Summary: The impact of mixed QCD-electroweak corrections on the production of W and Z bosons at the LHC was studied, showing a potential shift of up to 20 MeV in the extracted W mass value from W decays. To achieve the target precision of W-mass measurement at the LHC, fully differential computations of mixed QCD-electroweak corrections and a careful analysis of their potential impact on W mass determination are necessary.
Article
Astronomy & Astrophysics
Simone Alioli, Fabrizio Caola, Gionata Luisoni, Raoul Roentsch
Proceedings Paper
Physics, Particles & Fields
Raoul Rontsch, Markus Schulze
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
(2016)
Article
Astronomy & Astrophysics
Andrei V. Gritsan, Raoul Roentsch, Markus Schulze, Meng Xiao
