Herwig 7.0/Herwig++ 3.0 release note

By J. Bellm, S. Gieseke, David Grellscheid, Simon Plätzer, M. Rauch, C. Reuschle, P. Richardson, P. Schichtel, M. Seymour, A. Siódmok and 6 more. 2015

1,279 citations recorded by the source corpus.

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.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ac7922beb25c27dcf416d8a93a278f0830e8c9c4

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Citations in the corpus

Lepton Number Violation: Seesaw Models and Their Collider Tests (2017, methodology): “The models can be ported into modern, general-purpose event generators, such at Herwig [289], MadGraph5_aMC@NLO [290], and Sherpa [291].”
Herwig 7.2 release note (2019, methodology): “to the Schuler-Sjostrand [25] parton distribution functions for the photon have been included to allow the simulation of resolved photon processes. 9.2 FxFx The FxFx merging module was introduced in [1] to provide support of the NLO multi-jet merging method Johannes Bellm et al.: Herwig 7.2 Release ”
Reweighting QCD matrix-element and parton-shower calculations (2016, background): “In particular parton-shower Monte-Carlo programmes like Herwig [4,5], Pythia [6] and Sherpa [7,8] provide simulations at the level of exclusive particle-level final states [9].”
The Angantyr model for heavy-ion collisions in Pythia8 (2018, background): “d heavy ion collisions respectively, are often carried out in quite diﬀerent ways. In the case of pp collisions, so–called ”general purpose Monte Carlo event generators”, such as SHERPA [1], Herwig 7 [2] and PYTHIA8 [3], have been established as cornerstones in aiding our understanding. These event ”
Extraction and validation of a new set of CMS pythia8 tunes from underlying-event measurements (2019, background): “Since many parameters related to PS changed between HERWIG++ and HERWIG7, the CMS tunes extracted for HERWIG++ with the CTEQ6L1 PDF set and documented in Ref.”
Event generation with Sherpa 2.2 (2019, methodology): “ake the fragmentation component as inclusive as possible, we use a dynamic merging cut [110] with Q cut= 10 GeV using the following run-parameter settings: (run){ %corescalem_yy CORE_SCALE VAR{Abs2(p[2]+p[3])}; ... }(run) (processes){ Process 93 93 -> 22 22 93{3}; Order (*,2); %dynamicalmergingcu”
Jet substructure at the Large Hadron Collider: A review of recent advances in theory and machine learning (2017, background): “physics aspects. Examples include Pythia [142,143,144], a pT-ordered dipole shower; Vincia [145,146,147], Sherpa [148,149], Ariadne [150,151], and DIRE [152], dipole-antenna showers; Herwig++/Herwig7 [153,154,155,156,157,158], an angular-ordered dipole shower; Deductor [159,160,161,162,163,164,165],”
Evidence for Higgs boson decay to a pair of muons (2020, methodology): “In contrast, the parton shower (PS), hadronization, and simulation of the underlying event for the Zjj-EW process are performed with the herwig++ (2016 simulation) and herwig 7 (2017 and 2018) programs [73], as they have shown to better match the observed data compared to the pT-ordered pythia predi”
Deep learning in color: towards automated quark/gluon jet discrimination (2016, methodology): “itecture Previous studies of quark and gluon jet discrimination have found a notable dierence among dierent simulations [24,26]. Thus we generated events using both Pythia 8.219 [39] and Herwig 7.0 [40,41] using their respective default tunings and shower parameters. We simulated dijet events in ppc”
Measurement of the W boson mass (2021, methodology): “POWHEGHerwig: events are generated equivalently to those from POWHEGPythia but substituting Pythia with Herwig [50] for the parton-shower stage.”
The automation of next-to-leading order electroweak calculations (2018, background): “able in the MG5 aMC code in the near future. This will allow one to recover standard results for processes where such particles are tagged. { 6 { (which are available in both Pythia8 [73] and Herwig7 [74]) has been completed, some further validation will be necessary in order to bring the MC@NLO mat”