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The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
/ Alwall, J. (Taiwan, Natl. Taiwan U.) ; Frederix, R. (CERN) ; Frixione, S. (CERN) ; Hirschi, V. (SLAC) ; Maltoni, F. (Louvain U., CP3) ; Mattelaer, O. (Louvain U., CP3) ; Shao, H. -S. (Peking U. ; Peking U., SKLNPT) ; Stelzer, T. (Illinois U., Urbana) ; Torrielli, P. (Zurich U.) ; Zaro, M. (Paris U., IV ; Paris, LPTHE)
We discuss the theoretical bases that underpin the automation of the computations of tree-level and next-to-leading order cross sections, of their matching to parton shower simulations, and of the merging of matched samples that differ by light-parton multiplicities. We present a computer program, MadGraph5_aMC@NLO, capable of handling all these computations -- parton-level fixed order, shower-matched, merged -- in a unified framework whose defining features are flexibility, high level of parallelisation, and human intervention limited to input physics quantities. [...]
arXiv:1405.0301; CERN-PH-TH-2014-064; CP3-14-18; LPN14-066; MCNET-14-09; ZU-TH-14-14; CERN-PH-TH-2014-064; CP3-14-18; LPN14-066; MCNET-14-09; ZU-TH 14-14.-
2014 - 157 p.
- Published in : JHEP 07 (2014) 079
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External links: MadGraph5_aMC@NLO homepage; Launchpad page
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General-purpose event generators for LHC physics
/ Buckley, Andy (Edinburgh U.) ; Butterworth, Jonathan (University Coll. London) ; Gieseke, Stefan (KIT, Karlsruhe, TP) ; Grellscheid, David (Durham U., IPPP) ; Hoche, Stefan (SLAC) ; Hoeth, Hendrik (Durham U., IPPP) ; Krauss, Frank (Durham U., IPPP) ; Lonnblad, Leif (Lund U., Dept. Theor. Phys. ; CERN) ; Nurse, Emily (University Coll. London) ; Richardson, Peter (Durham U., IPPP) et al.
We review the physics basis, main features and use of general-purpose Monte Carlo event generators for the simulation of proton-proton collisions at the Large Hadron Collider. Topics included are: the generation of hard-scattering matrix elements for processes of interest, at both leading and next-to-leading QCD perturbative order; their matching to approximate treatments of higher orders based on the showering approximation; the parton and dipole shower formulations; parton distribution functions for event generators; non-perturbative aspects such as soft QCD collisions, the underlying event and diffractive processes; the string and cluster models for hadron formation; the treatment of hadron and tau decays; the inclusion of QED radiation and beyond-Standard-Model processes. [...]
arXiv:1101.2599; CAVENDISH-HEP-10-21; CERN-PH-TH-2010-298; DCPT-10-202; IPPP-10-101; KA-TP-40-2010; LU-TP-10-28; MAN-HEP-2010-23; SLAC-PUB-14333; HD-THEP-10-24; MCNET-11-01; CAVENDISH-HEP-10-21; CERN-PH-TH-2010-298; DCPT-10-202; HD-THEP-10-24; IPPP-10-101; KA-TP-40-2010; LU TP 10-28; MAN-HEP-2010-23; MCNET-11-01; SLAC-PUB-14333.-
2011 - 226 p.
- Published in : Phys. Rep. 504 (2011) 145-233
Fulltext: PDF; External link: SLAC Document Server
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Azimuthal correlations in high pT processes with the TMD parton branching method at NLO
/ van Kampen, Mees (Antwerp U.) ; Martinez, A Bermudez (DESY) ; Banos, L I Estevez (DESY) ; Hautmann, F (Antwerp U. ; CERN ; Oxford U.) ; Jung, H (DESY) ; Mendizabal, M (DESY) ; Figueroa, K Moral (Edinburgh U.) ; Prestel, S (Lund U.) ; Monfared, S Taheri (DESY) ; Wang, Q (DESY ; Peking U.) et al.
We discuss our recent results on azimuthal distributions in vector boson + jets and multi-jet production at the LHC, obtained from the matching of next-to-leading order (NLO) perturbative matrix elements with transverse momentum dependent (TMD) parton branching. We present a comparative analysis of boson-jet and jet-jet correlations in the back to-back region, and a study of the theoretical systematic uncertainties associated with the matching scale in the cases of TMD and collinear parton showers..
arXiv:2209.13945.-
2022 - 6 p.
- Published in : PoS ICHEP2022 (2022) 830
Fulltext: document - PDF; 2209.13945 - PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.830
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NLO matrix elements and truncated showers
/ Hoche, Stefan (Zurich U.) ; Krauss, Frank (Durham U., IPPP ; CERN) ; Schonherr, Marek (Dresden, Tech. U.) ; Siegert, Frank (Durham U., IPPP ; University Coll. London)
In this publication, an algorithm is presented that combines the ME+PS approach to merge sequences of tree-level matrix elements into inclusive event samples with the POWHEG method, which combines exact next-to-leading order matrix element results with the parton shower. It was developed in parallel to the MENLOPS technique and has been implemented in the event generator Sherpa. [...]
arXiv:1009.1127; ZU-TH-13-10; IPPP-10-73; DCPT-10-146; CERN-PH-TH-2010-195; MCNET-10-17; ZU-TH 13-10; IPPP-10-73; DCPT-10-146; CERN-PH-TH-2010-195; MCNET-10-17.-
2011 - 27 p.
- Published in : JHEP 08 (2011) 123
Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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