Giant QCD K-factors beyond NLO

Autor: Mathieu Rubin, Gavin P. Salam, Sebastian Sapeta
Přispěvatelé: Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Groupement d'Interet Scientifique Physique des deux infinis, ANR-09-BLAN-060,ANR-09-BLAN-060, ANR-09-BLAN-0060,Jet3G,Jetographie: jets de troisième géneration(2009)
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Journal of High Energy Physics
Journal of High Energy Physics, Springer, 2010, pp.09(2010)084. ⟨10.1007/JHEP09(2010)084⟩
Journal of High Energy Physics, 2010, pp.09(2010)084. ⟨10.1007/JHEP09(2010)084⟩
ISSN: 1126-6708
1029-8479
DOI: 10.1007/JHEP09(2010)084⟩
Popis: Hadronic observables in Z+jet events can be subject to large NLO corrections at TeV scales, with K-factors that even reach values of order 50 in some cases. We develop a method, LoopSim, by which approximate NNLO predictions can be obtained for such observables, supplementing NLO Z+jet and NLO Z+2-jet results with a unitarity-based approximation for missing higher loop terms. We first test the method against known NNLO results for Drell-Yan lepton pt spectra. We then show our approximate NNLO results for the Z+jet observables. Finally we examine whether the LoopSim method can provide useful information even in cases without giant K-factors, with results for observables in dijet events that can be compared to early LHC data.
Comment: 38 pages, 13 figures; v2 includes additional references
Databáze: OpenAIRE
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