Autor: Papaefstathiou, Andreas

Skocz do pozycji: 1.

Tytuł:: Herwig 7.3 release note
Autorzy:: Seymour, Michael H.
Plätzer, Simon
Kiebacher, Stefan
Papaefstathiou, Andreas
Richardson, Peter
Samitz, Daniel
Whitehead, James
Bewick, Gavin
Masouminia, Mohammad R.
Ferrario Ravasio, Silvia
Gieseke, Stefan
Siódmok, Andrzej
Opis:: 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-independent electroweak angular-ordered parton shower integrated with QCD and QED radiation; a new recoil scheme for initial-state radiation improving the behaviour of the angular-ordered parton shower; the incorporation of the heavy quark effective theory to refine the hadronization and decay of excited heavy mesons and heavy baryons; a dynamic strategy to regulate the kinematic threshold of cluster splittings within the cluster hadronization model; several improvements to the structure of the cluster hadronization model allowing for refined models; the possibility to extract event-by-event hadronization corrections in a well-defined way; the possibility of using the string model, with a dedicated tune. Additionally, a new tuning of the parton shower and hadronization parameters has been executed. This article discusses the novel features introduced in version 7.3.0.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

Skocz do pozycji: 2.

Tytuł:: NLO efforts in Herwig++
Autorzy:: Grellscheid, David
Wilcock, Alexandra
Harrendorf, Marco
Nail, Graeme
Rauch, Daniel
Plätzer, Simon
Fischer, Nadine
Bellm, Johannes
Richardson, Peter
Papaefstathiou, Andreas
Schichtel, Peter
Seymour, Michael
Reuschle, Christian
Rauch, Michael
Gieseke, Stefan
Siódmok, Andrzej
Opis:: With the advent and recent extension of the BLHA standard to interface Monte Carlo event generators and one-loop matrix element providers, the Herwig++ event generator has expanded its range of applicability to a multitude of underlying hard processes at NLO QCD. The new NLO development is centered around the Matchbox framework, which turns fixed NLO QCD calculations into parton shower matched calculations - to be matched to the two parton shower variants of Herwig++. Matchbox provides thereby for the automated setup of the underlying fixed NLO QCD calculations and the interface to the one-loop matrix element providers, as well as for an efficient and automated multi-channel phase space sampling, and forms the basis for the NLO capabilities of the new release of Herwig++. Along with several other new features and developments, the new release marks the end of distinguishing Herwig++ and (Fotran) HERWIG, and constitutes the first major release of version 7 of the Herwig event generator
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

Skocz do pozycji: 3.

Tytuł:: Herwig 7.0/Herwig++ 3.0 release note
Autorzy:: Grellscheid, David
Harrendorf, Marco A.
Wilcock, Alexandra
Nail, Graeme
Seymour, Michael H.
Rauch, Daniel
Plätzer, Simon
Fischer, Nadine
Bellm, Johannes
Richardson, Peter
Papaefstathiou, Andreas
Schichtel, Peter
Reuschle, Christian
Rauch, Michael
Gieseke, Stefan
Siódmok, Andrzej
Opis:: A major new release of the Monte Carlo event generator Herwig++ (version 3.0) is now available. This release marks the end of distinguishing Herwig++ and HERWIG development and therefore constitutes the first major release of version 7 of the Herwig event generator family. The new version features a number of significant improvements to the event simulation, including: built-in NLO hard process calculation for virtually all Standard Model processes, with matching to both angular-ordered and dipole shower modules via both subtractive (MC@NLO-type) and multiplicative (Powheg-type) algorithms; QED radiation and spin correlations in the angular-ordered shower; a consistent treatment of perturbative uncertainties within the hard process and parton showering. Several of the new features will be covered in detail in accompanying publications, and an update of the manual will follow in due course.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

Skocz do pozycji: 4.

Tytuł:: Herwig 7.2 release note
Autorzy:: Schichtel, Peter
Reuschle, Christian
Nail, Graeme
Loshaj, Frashër
Kirchgaeßer, Patrick
Masouminia, Mohammad R.
Ferrario Ravasio, Silvia
Podskubka, Radek
Webster, Stephen
Papaefstathiou, Andreas
Grellscheid, David
Seymour, Michael H.
Plätzer, Simon
Bellm, Johannes
Gieseke, Stefan
Rauch, Michael
Siódmok, Andrzej
Bewick, Gavin
Richardson, Peter
Opis:: A new release of the Monte Carlo event generator Herwig (version 7.2) is now available. This version introduces a number of improvements over the major version 7.0, notably: multi-jet merging with the dipole shower at LO and NLO QCD; spin correlations in both the dipole and angular-ordered parton showers; an improved choice of evolution variable in the angular-ordered parton shower; improvements to mass effects and top decays in the dipole shower, improvements to the simulation of multiple-parton interactions, including diffractive processes; a new model for baryonic colour reconnection; improvements to strangeness production; as well as a new tune of the hadronisation parameters and support for generic Lorentz structures in BSM models. This article illustrates new features of versions 7.1 and 7.2.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

Skocz do pozycji: 5.

Tytuł:: A standard convention for particle-level Monte Carlo event-variation weights
Autorzy:: Plätzer, Simon
Siódmok, Andrzej
Schönherr, Marek
Gignac, Matthew
Kretzschmar, Jan
Singh Chahal, Gurpreet
Schumann, Steffen
Bothmann, Enrico
Kar, Deepak
Höche, Stefan
McFayden, Josh
Lönnblad, Leif
Siegert, Frank
Andersen, Jeppe R.
Gütschow, Christian
Gellersen, Leif
Buckley, Andy
Prestel, Stefan
Krauss, Frank
Skands, Peter
Butterworth, Jonathan Mark
Seymour, Michael H.
Corpe, Louie
Papaefstathiou, Andreas
Bhattacharya, Saptaparna
Opis:: 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 prediction within a single event sample. But the lack of a common standard for labelling these variation streams across different tools has proven to be a major limitation for event-processing tools and analysers alike. Here we propose a well-defined, extensible community standard for the naming, ordering, and interpretation of weight streams that will serve as the basis for semantically correct parsing and combination of such variations in both theoretical and experimental studies.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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