Multijet matrix elements and shower evolution in hadronic collisions: -jets as a case study ☆

By M. Mangano, M. Moretti, R. Pittau. 2001

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We study in this paper the production, in hadronic collisions, of nal states with W gauge bosons, heavy quark pairs and n extra jets (with n up to 4). The complete partonic tree-level QCD matrix elements are evaluated using the ALPHA algorithm, and the events generated at the parton level are then evolved through the QCD shower and eventually hadronised using the coherent shower evolution provided by the HERWIG Monte Carlo. We discuss the details of our Monte Carlo implementation, and present results of phenomenological interest for the Tevatron Collider and for the LHC. We also comment on the impact of our calculation on the backgrounds to W (H ! b b) production, when only one b jet is tagged.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3d295e7b00ad4e9a0b4bae841bdaa734a7123aaa

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In Nuclear and High Energy Physics

Citations in the corpus

Event generation with Sherpa 2.2 (2019, methodology): “resummation in both regions. Originally these ideas have been proposed for the combination of tree-level matrix elements in [26, 27], and have been implemented, in variations, in all event generators [124, 125, 126, 127, 28, 128, 129, 29, 130, 131]. A dedicated comparison can, for example, be found ”
NLO QCD matrix elements + parton showers in e+e− → hadrons (2012, background): “They were pioneered in [1–4] and further matured in [5–8].”
NLO matrix elements and truncated showers (2010, result): “J H E P 0 8 ( 2 0 1 1 ) 1 2 3 known as “MLM merging”, was suggested in [18, 19] and described in more detail and compared with the other algorithms in [20, 21].”
Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector (2015, unknown): “The samples for W/Z+jets production are generated with Alpgen [77], employing the MLM matching scheme [78] between the hard process (calculated with LO matrix elements for up to five partons) and the parton shower.”
Event generation with SHERPA 1.1 (2008, methodology): “by generating each conﬁguration only once and using the appropriate path. 18 Basically two diﬀerent solutions for this problem have been proposed and implemented in the past few years, the MLM scheme [22], relying on a geometric analysis of the unconstrained radiation pattern in terms of cone jets, ”