Results 1 to 10 of about 107,544 (258)

Automatic Integral Reduction for Higher Order Perturbative Calculations [PDF]

, 2004
We present a program for the reduction of large systems of integrals to master integrals. The algorithm was first proposed by Laporta; in this paper, we implement it in MAPLE.
Charalampos Anastasiou
core   +10 more sources

Master integrals for mixed QCD-QED corrections to charged-current Drell-Yan production of a massive charged lepton

Journal of High Energy Physics, 2022
The master integrals for the mixed QCD-QED two-loop virtual corrections to the charged-current Drell-Yan process q q ¯ $$ q\overline{q} $$ ′ → ℓν are computed analytically by using the differential equation method.
Ming-Ming Long, Ren-You Zhang, Wen-Gan Ma, Yi Jiang, Liang Han, Zhe Li, Shuai-Shuai Wang   +6 more
doaj   +1 more source

The parton-level structure of e+e − to 2 jets at N3LO

Journal of High Energy Physics, 2023
We investigate the quantum chromodynamics (QCD) corrections to hadronic final states in electron-positron collisions at O $$ \mathcal{O} $$ ( α s 3 $$ {\alpha}_s^3 $$ ) in the strong coupling constant α s . Namely, we analytically compute the total cross
Petr Jakubčík, Matteo Marcoli, Giovanni Stagnitto   +2 more
doaj   +1 more source

Two-loop tensor integral coefficients in OpenLoops

Journal of High Energy Physics, 2022
We present a new and fully general algorithm for the automated construction of the integrands of two-loop scattering amplitudes. This is achieved through a generalisation of the open-loops method to two loops.
Stefano Pozzorini, Natalie Schär, Max F. Zoller   +2 more
doaj   +1 more source

A general algorithm to build mixed real and virtual antenna functions for higher-order calculations

Journal of High Energy Physics, 2023
The antenna-subtraction technique has demonstrated remarkable effectiveness in providing next-to-next-to-leading order in α s (NNLO) predictions for a wide range of processes relevant for the Large Hadron Collider.
Oscar Braun-White, Nigel Glover, Christian T. Preuss   +2 more
doaj   +1 more source

NLO computation of diffractive di-hadron production in a saturation framework

Journal of High Energy Physics, 2023
The cross-sections of diffractive double hadron photo- or electroproduction with large p T , on a nucleon or a nucleus, are calculated to NLO accuracy.
Michael Fucilla, Andrey Grabovsky, Emilie Li, Lech Szymanowski, Samuel Wallon   +4 more
doaj   +1 more source

Next-to-leading power resummed rapidity distributions near threshold for Drell-Yan and diphoton production

Journal of High Energy Physics, 2023
We consider Drell-Yan production and QCD-induced diphoton production and compute their rapidity distributions up to next-to-leading power (NLP) in the threshold variable.
Robin van Bijleveld, Eric Laenen, Leonardo Vernazza, Guoxing Wang   +3 more
doaj   +1 more source

Deciphering colour building blocks of massive multiparton amplitudes at 4-loops and beyond

Journal of High Energy Physics, 2023
The soft function in non-abelian gauge theories exponentiate, and their logarithms can be organised in terms of the collections of Feynman diagrams called Cwebs.
Neelima Agarwal, Sourav Pal, Aditya Srivastav, Anurag Tripathi   +3 more
doaj   +1 more source

One-loop Lipatov vertex in QCD with higher ϵ-accuracy

Journal of High Energy Physics, 2023
The effective Reggeon-Reggeon-gluon vertex, known as Lipatov vertex, is the key ingredient that allows to develop the BFKL approach in QCD. Within the next-to-leading logarithmic approximation, it is sufficient to know its one-loop corrections, in ...
Victor S. Fadin, Michael Fucilla, Alessandro Papa   +2 more
doaj   +1 more source

Recent developments in perturbative QCD [PDF]

, 2006
A brief overview of some recently active topics in perturbative QCD, including: string-inspired recursion techniques at tree level; recursion approaches and automation of standard techniques for 1-loop calculations; the status of NNLO jet calculations ...
Salam, Gavin P.
core   +4 more sources