APFEL++ is a C++ rewriting of the Fortran 77 code APFEL originally conceived to evolve collinear parton distribution functions (PDFs). However, APFEL++ is based on a completely new code design and guarantees a better performance along with a more optimal memory management. The new modular structure allows for better maintainability and easier extensibility. This makes APFEL++ suitable for a wide range of tasks: from the solution of the DGLAP evolution equations to the computation of deep-inelastic-scattering (DIS) and single-inclusive-annihilation cross sections. Also more complex computations, such as differential semi-inclusive DIS and Drell-Yan cross sections, are easily implementable in APFEL++.

The Scikit-HEP project (HEP stands for High Energy Physics, see more in the FAQ) is a community-driven and community-oriented project with the aim of providing Particle Physics at large with an ecosystem for data analysis in Python.

CLHEP is a set of HEP-specific foundation and utility classes such as random generators, physics vectors, geometry and linear algebra. CLHEP is structured in a set of packages independent of any external package.

xFitter is an open source QCD fit framework desinged to extract PDFs and assess the impact of new data. The xFitter project is is a common initiative by the H1 and ZEUS collaborations and extended to the LHC collaborations to provide precision QCD analyses. xFitter has been used as one of the main software packages for the determination of the HERA proton parton densities, HERAPDFs.

This package provides a library of 3rd-party add-ons to FastJet.

CLHEP is a set of HEP-specific foundation and utility classes such as random generators, physics vectors, geometry and linear algebra. CLHEP is structured in a set of packages independent of any external package.

The PHOTOS Monte Carlo is used for the generation of bremsstrahlung in the decay of particles and resonances.

This package provides a small and thin Python interface to read Les Houches Event (LHE) files.

The HepMC package is an object oriented C++ event record for High Energy Physics Monte Carlo generators and simulation.

Recola is a Fortran95 computer program for the automated generation and numerical computation of EW and QCD amplitudes in the Standard Model at next-to-leading order.

Implementation of calculation of the hadron jet cross sections in C++.

The HepMC package is an object oriented C++ event record for High Energy Physics Monte Carlo generators and simulation.

EvtGen is a Monte Carlo event generator that simulates the decays of heavy flavour particles, primarily B and D mesons. It contains a range of decay models for intermediate and final states containing scalar, vector and tensor mesons or resonances, as well as leptons, photons and baryons. Decay amplitudes are used to generate each branch of a given full decay tree, taking into account angular and time-dependent correlations which allows for the simulation of CP-violating processes.

This package provides a Pythonic Jupyter-friendly Python API for the HepMC3 library.

pyhepmc has been optimised for safety, usability, and efficiency by a human expert, something that an automatic tool cannot provide. It brings these unique features:

• Python idioms are supported where appropriate.

• Simple IO with pyhepmc.open.

• An alternative Numpy API whih accelerates event processing.

• The public API is fully documented with Python docstrings.

• Objects are inspectable in Jupyter notebooks.

• Events render as graphs in Jupyter notebooks.

PYTHIA is a program for the generation of high-energy physics collision events, i.e. for the description of collisions at high energies between electrons, protons, photons and heavy nuclei. It contains theory and models for a number of physics aspects, including hard and soft interactions, parton distributions, initial- and final-state parton showers, multiparton interactions, fragmentation and decay. It is largely based on original research, but also borrows many formulae and other knowledge from the literature. As such it is categorized as a general-purpose Monte Carlo event generator.

HOPPET is a Fortran package for carrying out DGLAP evolution and other common manipulations of PDFs. It also includes C++ and Python interfaces to many of the key features.

Recola2 is a Fortran95 computer program for the automated generation and numerical evaluation of amplitudes in general quantum field theories at one-loop order. It is the successor of Recola and extends it by additional features.

ThePEG is a toolkit for implementing HEP event generators, used as the common event-generation framework underlying Herwig 7.

VBFNLO is a fully flexible parton level Monte Carlo program for the simulation of vector boson fusion, double and triple vector boson production in hadronic collisions at next to leading order in the strong coupling constant. VBFNLO includes Higgs and vector boson decays with full spin correlations and all off-shell effects. In addition, VBFNLO implements CP-even and CP-odd Higgs boson via gluon fusion, associated with two jets, at the leading order one loop level with the full top-quark and bottom-quark mass dependence in a generic two Higgs doublet model.

The HepMC package is an object oriented C++ event record for High Energy Physics Monte Carlo generators and simulation.

LoopTools is a package for evaluation of scalar and tensor one-loop integrals based on the FF package by G.J. van Oldenborgh. It features an easy Fortran, C++, and Mathematica interface to the scalar one-loop functions of FF and in addition provides the 2-, 3-, and 4-point tensor coefficient functions.

LHAPDF is the standard tool for evaluating PDFs in high-energy physics. PDFs encode the flavour and momentum structure of composite particles, such as protons, pions and nuclei; most cross-section calculations are based on parton-level matrix-elements which must be connected to the real interacting particles, hence PDFs are an essential ingredient of phenomenological and experimental studies at hadron and heavy-ion colliders (e.g. LHC, HERA, Tevatron, EIC, FCC) and in cosmic-ray physics.

YODA is a small set of data analysis (specifically histogramming) classes being developed by MCnet members as a lightweight common system for MC event generator validation analyses, particularly as the core histogramming system in Rivet.

IOR is a parallel IO benchmark that can be used to test the performance of parallel storage systems using various interfaces and access patterns. The IOR repository also includes the mdtest benchmark which specifically tests the peak metadata rates of storage systems under different directory structures. Both benchmarks use a common parallel I/O abstraction backend and rely on MPI for synchronization.