Automation of NLO processes and decays and POWHEG matching in WHIZARD
Creators
- 1. DESY, Hamburg (Germany). Theory Group
- 2. Vienna Univ. (Austria). Erwin Schroedinger International Inst. for Mathematical Physics
- 3. Vienna Univ. (Austria). Faculty of Physics
- 4. Siegen Univ. (Germany)
- 5. Mainz Univ. (Germany). PRISMA Cluster of Excellence
- 6. Liverpool Univ. (United Kingdom). Dept. of Mathematical Sciences
Description
We give a status report on the automation of next-to-leading order processes within the Monte Carlo event generator WHIZARD, using GoSam and OpenLoops as provider for one-loop matrix elements. To deal with divergences, WHIZARD uses automated FKS subtraction, and the phase space for singular regions is generated automatically. NLO examples for both scattering and decay processes with a focus on e+e- processes are shown. Also, first NLO-studies of observables for collisions of polarized leptons beams, e.g. at the ILC, will be presented. Furthermore, the automatic matching of the fixed-order NLO amplitudes with emissions from the parton shower within the POWHEG formalism inside WHIZARD will be discussed. We also present results for top pairs at threshold in lepton collisions, including matching between a resummed threshold calculation and fixed-order NLO. This allows the investigation of more exclusive differential observables.
Files
47088773.pdf
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Additional details
Publishing Information
- Imprint Pagination
- 7 p.
- ISSN
- 0418-9833
- Report number
- DESY--16-033
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 47088773
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- AMPLITUDES; AUTOMATION; CASCADE SHOWERS; COMPUTERIZED SIMULATION; ELECTRON-POSITRON INTERACTIONS; EXCITATION FUNCTIONS; FEYNMAN DIAGRAM; GEV RANGE 100-1000; INTEGRAL CROSS SECTIONS; MATRIX ELEMENTS; MONTE CARLO METHOD; P CODES; PAIR PRODUCTION; PARTICLE DECAY; PERTURBATION THEORY; PHASE SPACE; POLARIZED BEAMS; SPIN ORIENTATION; T ANTIQUARKS; W CODES
- Descriptors DEC
- ANTIMATTER; ANTIPARTICLES; ANTIQUARKS; BEAMS; CALCULATION METHODS; COMPUTER CODES; CROSS SECTIONS; DECAY; DIAGRAMS; DIFFERENTIAL CROSS SECTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FUNCTIONS; GEV RANGE; INFORMATION; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MATHEMATICAL SPACE; MATTER; ORIENTATION; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; POSTULATED PARTICLES; QUARKS; SHOWERS; SIMULATION; SPACE; T QUARKS; TOP PARTICLES
Optional Information
- Secondary number(s)
- UWTHPH--2016; MITP--16-022; LTH--1077