scholarly journals N-jettiness soft function at next-to-next-to-leading order

2015 ◽  
Vol 91 (9) ◽  
Author(s):  
Radja Boughezal ◽  
Xiaohui Liu ◽  
Frank Petriello
Keyword(s):  
Leading Order ◽  
Soft Function

scholarly journals Three-loop soft function for energetic electroweak boson production at hadron colliders

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Ze Long Liu ◽  
Maximilian Stahlhofen
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Hadron Collider ◽  
Boson Production ◽  
Leading Order ◽  
Large Transverse Momentum ◽  
Hadron Colliders ◽  
Soft Function ◽  
Electroweak Boson ◽  
First Time

Abstract We calculate the three-loop soft function for the production of an electroweak boson (Higgs, γ, W±, Z) with large transverse momentum at a hadron collider. It is the first time a soft function for a three-parton process is computed at next-to-next-to-next-to-leading order (N3LO). As a technical novelty, we perform the calculation in terms of forward-scattering-type loop diagrams rather than evaluating phase space integrals. Our three-loop result contains color-tripole contributions and explicitly confirms predictions on the universal infrared structure of QCD scattering amplitudes with three massless parton legs. The soft function is a central ingredient in the factorized cross section for electroweak boson production near the kinematic endpoint (threshold), where the invariant mass of the recoiling hadronic radiation is small compared to its transverse momentum. Our result is required for predictions of the near-threshold cross sections at N3LO and for the resummation of threshold logarithms at primed next-to-next-to-next-to-leading logarithmic (N3LL′) accuracy.

scholarly journals Exclusive soft function for Drell-Yan at next-to-next-to-leading order

2011 ◽  
Vol 84 (9) ◽  
Author(s):  
Ye Li ◽  
Sonny Mantry ◽  
Frank Petriello
Keyword(s):  
Leading Order ◽  
Soft Function

scholarly journals The next-to-next-to-leading order soft function for top quark pair production

2018 ◽  
Vol 2018 (6) ◽  
Author(s):  
Guoxing Wang ◽  
Xiaofeng Xu ◽  
Li Lin Yang ◽  
Hua Xing Zhu
Keyword(s):  
Pair Production ◽  
Top Quark ◽  
Leading Order ◽  
Soft Function

Membrane theory

2017 ◽  
Author(s):  
David J. Steigmann
Keyword(s):  
Three Dimensional ◽  
Thin Sheets ◽  
Two Dimensional ◽  
Leading Order ◽  
Membrane Theory ◽  
Dimensional Theory ◽  
Small Thickness

This chapter develops two-dimensional membrane theory as a leading order small-thickness approximation to the three-dimensional theory for thin sheets. Applications to axisymmetric equilibria are developed in detail, and applied to describe the phenomenon of bulge propagation in cylinders.

scholarly journals Espalhamento Bhabha: Um Estudo Detalhado

2018 ◽  
Vol 40 (3) ◽  
Author(s):  
Fábio Köpp Nóbrega ◽  
Luiz Fernando Mackedanz
Keyword(s):  
Leading Order ◽  
Para Determinar

Resumo Neste artigo, vamos estudar alguns conceitos fundamentais em física de partículas através do estudo detalhado de um processo específico da Eletrodinâmica Quântica (QED): o espalhamento Bhabha em ordem dominante (Leading Order - LO). Este ocorre na interação entre um elétron e sua antipartícula, o pósitron, sendo um dos processos básicos da QED. Nossa escolha em trabalhar este processo deve-se a riqueza de detalhes proporcionada pelas duas possibilidades (canais) de interação, que servem para ilustrar o cálculo da interferência entre as possibilidades. Além disso, esse processo é utilizado para determinar a luminosidade de um determinado colisor, o que garante maior precisão nas medidas de outras grandezas relevantes para a análise das interações entre partículas. Finalmente, comparamos a predição da QED com os resultados do experimento DESY-PETRA-TASSO.

scholarly journals Complete leading-order standard model corrections to quantum leptogenesis

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Paul Frederik Depta ◽  
Andreas Halsch ◽  
Janine Hütig ◽  
Sebastian Mendizabal ◽  
Owe Philipsen
Keyword(s):  
Standard Model ◽  
Gauge Coupling ◽  
Thermal Bath ◽  
Leading Order ◽  
Boltzmann Equations ◽  
The Standard Model ◽  
Majorana Neutrinos ◽  
Infinite Loop ◽  
First Time ◽  
The Universe

Abstract Thermal leptogenesis, in the framework of the standard model with three additional heavy Majorana neutrinos, provides an attractive scenario to explain the observed baryon asymmetry in the universe. It is based on the out-of-equilibrium decay of Majorana neutrinos in a thermal bath of standard model particles, which in a fully quantum field theoretical formalism is obtained by solving Kadanoff-Baym equations. So far, the leading two-loop contributions from leptons and Higgs particles are included, but not yet gauge corrections. These enter at three-loop level but, in certain kinematical regimes, require a resummation to infinite loop order for a result to leading order in the gauge coupling. In this work, we apply such a resummation to the calculation of the lepton number density. The full result for the simplest “vanilla leptogenesis” scenario is by $$ \mathcal{O} $$ O (1) increased compared to that of quantum Boltzmann equations, and for the first time permits an estimate of all theoretical uncertainties. This step completes the quantum theory of leptogenesis and forms the basis for quantitative evaluations, as well as extensions to other scenarios.

Sign in / Sign up

Export Citation Format

Share Document