Abstract
Sherpa is a general-purpose Monte Carlo event generator for the simulation of particle collisions in high-energy collider experiments. We summarise essential features and improvements of the Sherpa 2.2 release series, which is heavily used for event generation in the analysis and interpretation of LHC Run 1 and Run 2 data. We highlight a decade of developments towards ever higher precision in the simulation of particle-collision events.
Highlights
The need to match parton showers to higher-order matrix elements, in particular multi-leg tree-level or one-loop matrix elements, has served as a development paradigm. This raises issues about matching the exact singularity and colour structure of QCD matrix elements, preserving their fixed-order accuracy, without compromising on the resummation property of the parton shower. This has for instance led to the formulation of shower algorithms based on next-to-leading order (NLO) QCD infrared subtraction schemes
We present results based on inclusive Higgs production as well as Higgs production in association with one jet at NLO accuracy in the strong coupling, while Higgs production in association with two and three jets is described at leading order (LO) accuracy, merged using the standard MEPS@NLO method, cf. [145]
The SHERPA framework has been extensively used for event generation during the LHC Run 1 and Run 2, and represents a decade of developments towards ever higher precision in the simulation
Summary
Monte Carlo event generators are indispensable tools for the design, realisation, analysis and interpretation of high-energy scattering experiments. The SHERPA event generator framework, introduced about fifteen years ago [3, 5], is a general-purpose simulation tool for particle collisions at high-energy colliders It contains implementations of all components needed for a factorised and probabilistic description of scattering events at hadron-hadron, lepton-hadron and lepton-lepton colliders. Multijet-merging algorithms based on truncated showers tree-level and one-loop matrix elements: MEPS@LO and MEPS@NLO approximate electroweak corrections NNLO QCD with parton showers selected processes only. For the decay of heavy resonances such as W , Z, or Higgs bosons or top quarks Both include automated methods for efficient phase-space integration and algorithms for the subtraction of infrared divergences in calculations at next-to-leading order (NLO) in QCD [9,10,11] and the electroweak theory [12]. For more detailed and pedagogical reviews of general Monte Carlo event generation techniques and their practical implementations we refer interested readers to [4,46,47]
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