Momentum conservation and unitarity in parton showers and NLL resummation

Abstract

We present a systematic study of differences between NLL resummation and parton showers. We first construct a Markovian Monte-Carlo algorithm for resummation of additive observables in electron-positron annihilation. Approximations intrinsic to the pure NLL result are then removed, in order to obtain a traditional, momentum and probability conserving parton shower based on the coherent branching formalism. The impact of each approximation is studied, and an overall comparison is made between the parton shower and pure NLL resummation. Differences compared to modern parton-shower algorithms formulated in terms of color dipoles are analyzed.

13 pages, 1 table, 8 figures

References in corpus (2)

• Parton Fragmentation within an Identified Jet at NNLL
• Soft evolution of multi-jet final states

Cited by in corpus (22)

• Event Generation with Sherpa 2.2
• 50 Years of Quantum Chromodynamics
• Parton showers beyond leading logarithmic accuracy
• Leading-color fully differential two-loop soft corrections to QCD dipole showers
• Event Generators for High-Energy Physics Experiments
• Summations of large logarithms by parton showers
• Non-global logarithms in jet and isolation cone cross sections
• Jet Angularities in Z+jet production at the LHC
• Fitting the Strong Coupling Constant with Soft-Drop Thrust
• Jet Substructure from Dark Sector Showers
• Soft-drop grooming for hadronic event shapes
• Numerical resummation at subleading color in the strongly ordered soft gluon limit
• Multi-jet merging in a variable flavor number scheme
• Resummed predictions for jet-resolution scales in multijet production in $e^{+}{e}^{-}$ annihilation
• Disentangling soft and collinear effects in QCD parton showers
• Calculating the angle between jet axes
• A Monte-Carlo Simulation of Double Parton Scattering
• Introduction to the PanScales framework, version 0.1
• Jet Structure Studies in Small Systems
• Multivariable evolution in parton showers with initial state partons
• How much joint resummation do we need?
• Event generation at MEPS@NLO accuracy in neutral and charged current DIS at the EIC