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The new multipurpose event-generation framework SHERPA, acronym for Simulation for High-Energy Reactions of PArticles, is presented. It is entirely written in the object-oriented programming language C++. In its current form, it is able to…

High Energy Physics - Phenomenology · Physics 2014-11-17 T. Gleisberg , S. Hoeche , F. Krauss , A. Schaelicke , S. Schumann , J. Winter

We present the implementation within the Pythia8 event generator of a set of parton distributions based on NNPDF methodology. We construct a set of leading-order parton distributions with QED corrections, NNPDF2.3QED LO set, based on the…

High Energy Physics - Phenomenology · Physics 2013-11-26 Stefano Carrazza , Stefano Forte , Juan Rojo

We present a new version of the CompHEP program (version 4.4). We describe shortly new issues implemented in this version, namely, simplification of quark flavor combinatorics for the evaluation of hadronic processes, Les Houches Accord…

High Energy Physics - Phenomenology · Physics 2008-11-26 E. Boos , V. Bunichev , M. Dubinin , L. Dudko , V. Ilyin , A. Kryukov , V. Edneral , V. Savrin , A. Semenov , A. Sherstnev

We present and discuss the generator setup for e+e- -> 4f processes chosen by the DELPHI collaboration. The need to combine the most recent theoretical achievements in the CC03 sector with the state of the art description of the remaining…

High Energy Physics - Phenomenology · Physics 2009-11-07 A. Ballestrero , R. Chierici , F. Cossutti , E. Migliore

Event generators play a crucial role in the exploration of LHC physics. This presentation summarizes news and plans for the three general-purpose pp generators HERWIG, PYTHIA and SHERPA, as well as briefer notes on a few other generators.…

High Energy Physics - Phenomenology · Physics 2016-08-24 Torbjörn Sjöstrand

We present version 8 of the CHIANTI database. This version includes a large amount of new data and ions, which represent a significant improvement in the soft X-ray, EUV and UV spectral regions, which several space missions currently cover.…

Solar and Stellar Astrophysics · Physics 2015-10-14 G. Del Zanna , K. P. Dere , P. R. Young , E. Landi , H. E. Mason

Past research has proposed numerous hardware prefetching techniques, most of which rely on exploiting one specific type of program context information (e.g., program counter, cacheline address) to predict future memory accesses. These…

Hardware Architecture · Computer Science 2023-04-07 Rahul Bera , Konstantinos Kanellopoulos , Anant V. Nori , Taha Shahroodi , Sreenivas Subramoney , Onur Mutlu

A new release of the Monte Carlo program HERWIG (version 6.5) is now available. The main new features are: support for the Les Houches interface to matrix element generators; additional SM and MSSM Higgs processes in lepton collisions;…

High Energy Physics - Phenomenology · Physics 2007-05-23 G Corcella , IG Knowles , G Marchesini , S Moretti , K Odagiri , P Richardson , MH Seymour , BR Webber

A new release of the Monte Carlo event generator Herwig (version 7.1) is now available. This version introduces a number of improvements, notably: multi-jet merging with the dipole shower at LO and NLO QCD; a new model for soft interactions…

This is a status report of the WHIZARD Monte Carlo multi-purpose event generator given at the LCFORUM 2012 at DESY. I review here the development of the WHIZARD generator version 2 with a special emphasis on linear collider physics. In case…

High Energy Physics - Phenomenology · Physics 2012-04-30 Juergen Reuter

A community of developers has formed to modernize the Fortran ecosystem. In this article, we describe the high-level features of Fortran that continue to make it a good choice for scientists and engineers in the 21st century. Ongoing…

Understanding the production of quarks and gluons in high energy collisions and their evolution is a very active area of investigation. Monte carlo event generator PYTHIA8 uses the parton shower model to simulate such collisions and is…

High Energy Physics - Phenomenology · Physics 2021-02-26 S. K. Kundu , T. Sarkar , M. Maity

I present a preliminary version of {\tt APFEL++}, a C++ rewriting of the Fortran 77 evolution code {\tt APFEL}. In this contribution I discuss the new philosophy adopted for the numerical computation of the convolutions, demonstrate the…

High Energy Physics - Phenomenology · Physics 2017-08-04 Valerio Bertone

We here present some recent developments of MadGraph/MadEvent since the latest published version, 4.0. These developments include: Jet matching with Pythia parton showers for both Standard Model and Beyond the Standard Model processes,…

High Energy Physics - Phenomenology · Physics 2009-02-02 Johan Alwall , Pierre Artoisenet , Simon de Visscher , Claude Duhr , Rikkert Frederix , Michel Herquet , Olivier Mattelaer

We introduce a method for matching the neutral-current deep inelastic scattering process with parton showers at first order in the strong coupling. This multiplicative matching is achieved by reweighting leading-order Born-level events and…

High Energy Physics - Phenomenology · Physics 2026-05-13 Ilkka Helenius , Joni O. Laulainen , Christian T. Preuss

ChatGPT (Chat Generative Pre-trained Transformer) is a chatbot launched by OpenAI on November 30, 2022. OpenAI's GPT-3 family of large language models serve as the foundation for ChatGPT. ChatGPT is fine-tuned with both supervised and…

Software Engineering · Computer Science 2023-05-29 Giriprasad Sridhara , Ranjani H. G. , Sourav Mazumdar

This year marks the consolidation of Julia (https://julialang.org/), a programming language designed for scientific computing, as the first stable version (1.0) has been released, in August 2018. Among its main features, expressiveness and…

Instrumentation and Methods for Astrophysics · Physics 2018-12-05 Maurizio Tomasi , Mosè Giordano

A new release of the Monte Carlo event generator Herwig (version 7.2) is now available. This version introduces a number of improvements, notably: improvements to the simulation of multiple-parton interactions, including diffractive…

Modern Fortran is a standardized language that includes object-oriented and parallel programming paradigms. The Fortran-lang community, created at the end of 2019, is actively working to modernize its ecosystem. New compilers are under…

Distributed, Parallel, and Cluster Computing · Computer Science 2024-02-13 Vincent Magnin , José Alves , Antoine Arnoud , Arjen Markus , Michele Esposito Marzino

The development and operation of large-scale particle physics facilities rely not only on accelerators and detectors, but also on sustained, high-precision simulation infrastructure. Originating in Lund in the late 1970s and continuously…

High Energy Physics - Phenomenology · Physics 2026-03-03 Christian Bierlich , Leif Lönnblad , Torbjörn Sjöstrand