Simon Plätzer
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View article: Fully differential soft gluon evolution at the amplitude level
Fully differential soft gluon evolution at the amplitude level Open
A bstract We study differential intra-jet radiation patterns in jet production at full colour. We present a systematic study of several QCD 2 → 2 processes and also multi-jet production from a colourless initial state. We examine how suble…
View article: Phenomenological constraints of the building blocks of the cluster hadronization model
Phenomenological constraints of the building blocks of the cluster hadronization model Open
We introduce building blocks for the cluster hadronization model in light of a new structure, focusing on cluster fission and cluster decay. We propose theoretically motivated matrix elements for cluster fission and decay as building block…
View article: Matching hadronization and perturbative evolution: the cluster model in light of infrared shower cutoff dependence
Matching hadronization and perturbative evolution: the cluster model in light of infrared shower cutoff dependence Open
A bstract In the context of Monte Carlo (MC) generators with parton showers that have next-to-leading-logarithmic (NLL) precision, the cutoff Q 0 terminating the shower evolution should be viewed as an infrared factorization scale so that …
View article: NLO QCD parton shower matching for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>ν</mml:mi><mml:mi>e</mml:mi></mml:msub><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msub><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mi>μ</mml:mi></mml:msub><mml:mi>γ</mml:mi><mml:mo>+</mml:mo><mml:mi>X</mml:mi></mml:math>
NLO QCD parton shower matching for Open
We present the implementation of a new interface in 3.0 supporting all diboson and triboson processes with fully leptonic final states, enabling next-to-leading order (NLO)+parton shower (PS) matched calculations. To demonstrate its capabi…
View article: Phenomenological constraints of the building blocks of the cluster hadronization model
Phenomenological constraints of the building blocks of the cluster hadronization model Open
We introduce building blocks for the cluster hadronization model in light of a new structure, focusing on cluster fission and cluster decay. We propose theoretically motivated matrix elements for cluster fission and decay as building block…
View article: The observable spectrum for GUT-like theories
The observable spectrum for GUT-like theories Open
View article: Exact colour evolution for jet observables
Exact colour evolution for jet observables Open
We perform a systematic and comprehensive analysis of sub-leading colour corrections in perturbative QCD processes involving multiple soft gluon emissions. This necessitates going beyond the standard parton shower paradigm in order to inco…
View article: The observable spectrum for GUT-like theories
The observable spectrum for GUT-like theories Open
The spectrum of nonabelian gauge theories cannot be described in terms of elementary particles, and so must be constructed from gauge-invariant composite operators, even in the presence of a Brout--Englert--Higgs effect. This leads to qual…
View article: Subleading Higgs effects at lepton colliders
Subleading Higgs effects at lepton colliders Open
View article: NLO QCD parton shower matching for $p p \rightarrow e^{+} ν_e μ^{-} \barν_μ γ+ X$
NLO QCD parton shower matching for $p p \rightarrow e^{+} ν_e μ^{-} \barν_μ γ+ X$ Open
We present the implementation of a new interface in VBFNLO 3.0 supporting all di-boson and tri-boson processes with fully leptonic final states, enabling NLO+PS matched calculations. To demonstrate its capabilities, we study parton shower …
View article: Dark sector showers and hadronisation in Herwig 7
Dark sector showers and hadronisation in Herwig 7 Open
View article: Herwig 7.3 release note
Herwig 7.3 release note Open
A new release of the Monte Carlo event generator (version 7.3) has been launched. This iteration encompasses several enhancements over its predecessor, version 7.2. Noteworthy upgrades include: the implementation of a process-independent e…
View article: Subleading Higgs effects at lepton colliders
Subleading Higgs effects at lepton colliders Open
Subtle field-theoretical effects suggest the presence of additional Higgs contributions in standard model processes. This has been supported by electroweak lattice calculation, e.\ g.\ for vector boson scattering. These effects can be incl…
View article: Amplitude factorization in the electroweak standard model
Amplitude factorization in the electroweak standard model Open
We provide tools to analyze factorization at the amplitude level for processes involving the entire standard model. We focus in particular on a momentum region, in which the factorization of real and certain virtual corrections appears in …
View article: Dark Sector Showers and Hadronisation in Herwig 7
Dark Sector Showers and Hadronisation in Herwig 7 Open
We present a novel simulation of a strongly interacting dark sector also known as the Hidden Valley scenarios using angular ordered showers and the cluster hadronisation model in Herwig 7. We discuss the basics of this implementation and t…
View article: One-loop calculations in the chirality-flow formalism
One-loop calculations in the chirality-flow formalism Open
In a few recent papers we introduced the chirality-flow formalism, which builds on the spinor-helicity formalism, but incorporates the Fierz identity into the Feynman rules. Calculations at tree level are thereby trivial, often to the exte…
View article: Photoproduction in general-purpose event generators
Photoproduction in general-purpose event generators Open
We present a comparison of three different general-purpose Monte Carlo event generators, Herwig, Pythia, and Sherpa, with respect to the simulation of photoproduction. We outline the default inputs, implementation differences and compare t…
View article: Wigner 6j symbols with gluon lines: completing the set of 6j symbols required for color decomposition
Wigner 6j symbols with gluon lines: completing the set of 6j symbols required for color decomposition Open
A bstract We construct a set of Wigner 6𝑗 symbols with gluon lines (adjoint representations) in closed form, expressed in terms of similar 6𝑗 symbols with quark lines (fundamental representations). Together with these Wigner 6𝑗 symbols wit…
View article: Matching Hadronization and Perturbative Evolution: The Cluster Model in Light of Infrared Shower Cutoff Dependence
Matching Hadronization and Perturbative Evolution: The Cluster Model in Light of Infrared Shower Cutoff Dependence Open
In the context of Monte Carlo (MC) generators with parton showers that have next-to-leading-logarithmic (NLL) precision, the cutoff $Q_0$ terminating the shower evolution should be viewed as an infrared factorization scale so that paramete…
View article: Amplitude and colour evolution
Amplitude and colour evolution Open
Colour evolution and parton branching at the amplitude level have become important theoretical frameworks to improve parton showers, and are algorithms in their own right: They complement shower development by resummation algorithms capabl…
View article: Precision QCD at FCC-ee
Precision QCD at FCC-ee Open
We discuss the status and challenges of predicting QCD effects at the FCC-ee, in the context of the FCC-ee QCD working group. In this presentation we focus on multi-purpose event generators, and parton showers and hadornization in particul…
View article: Focus topics for the ECFA study on Higgs / Top / EW factories
Focus topics for the ECFA study on Higgs / Top / EW factories Open
In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define…
View article: Beyond the Narrow-Width Limit for Off-Shell and Boosted Differential Top Quark Decays
Beyond the Narrow-Width Limit for Off-Shell and Boosted Differential Top Quark Decays Open
The standard approaches for describing top quark production and its decay dynamics are currently mostly either based on the narrow-width (NW) limit or on off-shell fixed-order calculations. In this article we present a factorised approach …
View article: Les Houches 2023: Physics at TeV Colliders: Standard Model Working Group Report
Les Houches 2023: Physics at TeV Colliders: Standard Model Working Group Report Open
This report presents a short summary of the activities of the 'Standard Model' working group for the 'Physics at TeV Colliders' workshop (Les Houches, France, 12-30 June, 2023).
View article: Wigner 6j symbols with gluon lines: completing the set of 6j symbols required for color decomposition
Wigner 6j symbols with gluon lines: completing the set of 6j symbols required for color decomposition Open
We construct a set of Wigner 6j symbols with gluon lines (adjoint representations) in closed form, expressed in terms of similar 6j symbols with quark lines (fundamental representations). Together with Wigner 6j symbols with quark lines, t…
View article: Herwig 7.3 Release Note
Herwig 7.3 Release Note Open
A new release of the Monte Carlo event generator Herwig (version 7.3) has been launched. This iteration encompasses several enhancements over its predecessor, version 7.2. Noteworthy upgrades include: the implementation of a process-indepe…
View article: Colour evolution and infrared physics
Colour evolution and infrared physics Open
A bstract We give a complete account of how soft gluon, massless quark, evolution equations in colour space originate, from a factorization into a hard cross section density operator and a soft function encoding measurements and the projec…
View article: One-loop calculations in the chirality-flow formalism
One-loop calculations in the chirality-flow formalism Open
In a few recent papers we introduced the chirality-flow formalism, which was shown to make calculations of tree-level Feynman diagrams simple and transparent. Chirality flow, which is based on the spinor-helicity formalism, allows to often…
View article: A standard convention for particle-level Monte Carlo event-variation weights
A standard convention for particle-level Monte Carlo event-variation weights Open
Streams of event weights in particle-level Monte Carlo event generators are a convenient and immensely CPU-efficient approach to express systematic uncertainties in phenomenology calculations, providing systematic variations on the nominal…
View article: Report on 2210.09178v1
Report on 2210.09178v1 Open
Colour evolution and parton branching at the amplitude level have become important theoretical frameworks to improve parton showers, and are algorithms in their own right: they complement shower development by resummation algorithms capabl…