Evolution of parton showers and parton distribution functions

Nagy, Zoltán; Soper, Davison E.

doi:10.1103/physrevd.102.014025

Cited by 19 publications

(15 citation statements)

References 25 publications

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“…In Ref. [78] the z M limit was identified as a source of systematic uncertainty when using conventional showers with standard collinear pdfs; in the PB approach, the same z M limit is present in the parton evolution as well as in the PB-shower. The PB approach allows a consistent formulation of the parton shower with the PB TMDs, as in both Sudakov form factors a and bw the same value of z M is used.…”

Section: From Pb Tmd Evolution To Tmd Parton Showermentioning

confidence: 99%

CASCADE3 A Monte Carlo event generator based on TMDs

et al. 2021

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The Cascade3 Monte Carlo event generator based on Transverse Momentum Dependent (TMD) parton densities is described. Hard processes which are generated in collinear factorization with LO multileg or NLO parton level generators are extended by adding transverse momenta to the initial partons according to TMD densities and applying dedicated TMD parton showers and hadronization. Processes with off-shell kinematics within $$k_{{t}}$$ k t -factorization, either internally implemented or from external packages via LHE files, can be processed for parton showering and hadronization. The initial state parton shower is tied to the TMD parton distribution, with all parameters fixed by the TMD distribution.

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Section: From Pb Tmd Evolution To Tmd Parton Showermentioning

confidence: 99%

CASCADE3 A Monte Carlo event generator based on TMDs

et al. 2021

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“…is the derivative with respect to the shower scale of the singular operator for a one loop virtual graph. It is sometimes assumed that the effect of virtual graphs and PDF evolution cancels the integral over the splitting variables of parton splitting [14]. However, this cancellation is not complete, so that the effect of S…”

Section: Perturbative Expansionsmentioning

confidence: 99%

Summations of large logarithms by parton showers

Nagy,

Soper

2020

Preprint

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“…Methods to overcome such issues have been discussed[12,13], but require a radical redesign of showering algorithms…”

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confidence: 99%

Combining N3LO QCD calculations and parton showers for hadronic collision events

Bertone¹,

Prestel²

2022

Preprint

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Detailed and precise background predictions are the backbone of large parts of high-energy collider phenomenology. This requires to embed precision QCD calculations into detailed event generators, to produce comprehensive software simulations. Only continued progress in this direction will allow us to exploit the full potential of measurements at the Large Hadron Collider, or at a future Electron-Ion Collider. This work presents a method to combine third-order QCD calculations for hadronic scattering processes with Monte-Carlo event generators, thus enabling a new generation of precision predictions. I. INTRODUCTIONMeasurements at particle colliders aim to provide insights into the fundamental building blocks of physics by juxtaposing experimentally recorded scattering final states with detailed theory simulations. Any deviation from the expectation (based on the Standard Model of particle physics) hints at new research directions.This "indirect search" strategy relies on sophisticated event generators, which should furnish an accurate model of the scattering dynamics [1]. On top of this, precision predictions have become ever more important, as detailed error budgets are mandatory for reliable comparisons to experimental data. Such predictions are crucial to the LHC phenomenology programme -where new-physics signals have to be lifted from immense QCD backgrounds -as well as future Electron-Ion colliders, where novel QCD phenomena have to be confronted with higher-order QCD calculations within the collinear factorization approximation. These simulations rely on combining high-precision fixed-order (QCD) calculations with parton evolution via all-order parton showering, yielding higher-order event generators.NLO event generators [2] have become the staple of LHC phenomenology, while NNLO event generators have, albeit still requiring cutting-edge research, become more commonplace [3]. These generators typically require dedicated implementations of higher-order calculations. Thus, methods to enable higher-order event generators should ideally be known when leaps in precision are achieved in fixed-order calculations.Recent years have seen impressive progress in producing N3LO fixed-order QCD predictions, both at the inclusive [4] and the fully differential level [5][6][7][8]. In some cases, these fully-differential results have even been used to supplement resummed predictions for important observables [6][7][8][9]. This note offers a method to produce N3LO event generators for processes with incoming hadrons, expanding on the proof-of-principle work [10] concerned with leptonic collisions. The method employs an intuitive "subtract what you add" scheme to disentangle fixed-order corrections and partonshower contributions, up to third order in QCD. The feasibility of an implementation of the method is tested using the controlled environment of a "toy N3LO calculation" 1 . Overall, these tests provide abstract arguments for the validity and accuracy of the NNLO+PS method with a numerical verification. II. N3LO MATCHING...

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Evolution of parton showers and parton distribution functions

Cited by 19 publications

References 25 publications

CASCADE3 A Monte Carlo event generator based on TMDs

CASCADE3 A Monte Carlo event generator based on TMDs

Summations of large logarithms by parton showers

Combining N3LO QCD calculations and parton showers for hadronic collision events

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