52,659 research outputs found

    NLO QCD corrections in Herwig++ with MC@NLO

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    We present the calculations necessary to obtain next-to-leading order QCD precision with the Herwig++ event generator using the MC@NLO approach, and implement them for all the processes that were previously available from Fortran HERWIG with MC@NLO. We show a range of results comparing the two implementations. With these calculations and recent developments in the automatic generation of NLO matrix elements, it will be possible to obtain NLO precision with Herwig++ for a much wider range of processesComment: 26 pages, 28 figure

    Herwig++ 2.0 Release Note

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    A new release of the Monte Carlo program Herwig++ (version 2.0) is now available. This is the first version of the program which can be used for hadron-hadron physics and includes the full simulation of both initial- and final-state QCD radiation.Comment: Source code and additional information available at http://hepforge.cedar.ac.uk/herwig

    Colour Rearrangement for Dipole Showers

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    We present an algorithm to rearrange the colour chains of dipole showers in the shower process according to the colour amplitudes of a simple matrix element. We implement the procedure in the dipole shower of Herwig and show comparisons to data.Comment: 4 pages, 6 figures, HERWIG-2018-01, LU-TP-18-01, MCnet-18-0

    The new Monte Carlo Event Generator Herwig++

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    We present results obtained with the new Monte Carlo event generator Herwig++. In its first version (1.0), Herwig++ is capable of simulating e+e- Annihilation events. We compare results for different distributions with a vast amount of available data from e+e- annihilation.Comment: Proceedings of the XIIth International Workshop on Deep Inelastic Scattering (DIS04), Strbske Pleso, Slovakia, April 14-18 200

    Herwig 7.1 Release Note

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    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 and diffraction; improvements to mass effects and top decays in the dipole shower, as well as a new tune of the hadronisation parameters.Comment: 7 pages, 7 figures. Herwig is available from https://herwig.hepforge.org

    Bottom-quark fragmentation: comparing results from tuned event generators and resummed calculations

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    We study bottom-quark fragmentation in e+e- annihilation, top and Higgs decay H -> b bbar, using Monte Carlo event generators, as well as calculations, based on the formalism of perturbative fragmentation functions, which resum soft- and collinear-radiation effects in the next-to-leading logarithmic approximation. We consider the PYTHIA and HERWIG generators, and implement matrix-element corrections to the parton shower simulation of the H -> b bbar process in HERWIG. We tune the Kartvelishvili, string and cluster models to B-hadron data from LEP and SLD, and present results in both x_B and moment spaces. The B-hadron spectra yielded by HERWIG, PYTHIA and resummed calculations show small discrepancies, which are due to the different approaches and models employed and to the quality of the fits to the e+e- data.Comment: 22 pages, 11 colour figures. Minor changes in the text, published versio

    News from HERWIG

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    I review the current status and future plans of the HERWIG collaboration.Comment: 4 pages, Contribution to Proceedings of XLth Rencontres de Moriond, QCD and High Energy Hadronic Interactions, La Thuile, Italy, March 12th-19th, 200
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