Jet cross sections at the LHC and the quest for higher precision
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Regular Article - Theoretical Physics
Jet cross sections at the LHC and the quest for higher precision Johannes Bellm1,a , Andy Buckley2 , Xuan Chen3 , Aude Gehrmann-De Ridder3,4 , Thomas Gehrmann3 , Nigel Glover5 , Stefan Höche6,7 , Alexander Huss8 , Joey Huston9 , Silvan Kuttimalai6 , Joao Pires10 , Simon Plätzer11 , Emanuele Re8,12 1
Department of Astronomy and Theoretical Physics, Lund University, 223 62 Lund, Sweden School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK 3 Institut für Theoretische Physik, Universität Zürich, 8057 Zürich, Switzerland 4 Institute for Theoretical Physics, ETH, 8093 Zürich, Switzerland 5 Institute for Particle Physics Phenomenology, Durham University, Durham DH1 3LE, UK 6 SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA 7 Fermi National Accelerator Laboratory, Batavia, IL 60510-0500, USA 8 Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland 9 Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA 10 CFTP, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal 11 Fakultät Physik, University of Vienna, 1010 Vienna, Austria 12 Laboratoire d’Annecy-le-Vieux de Physique Théorique, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, 74940 Annecy, France 2
Received: 3 June 2019 / Accepted: 20 December 2019 © The Author(s) 2020
Abstract We perform a phenomenological study of Z plus jet, Higgs plus jet and di-jet production at the Large Hadron Collider. We investigate in particular the dependence of the leading jet cross section on the jet radius as a function of the jet transverse momentum. Theoretical predictions are obtained using perturbative QCD calculations at the nextto and next-to-next-to-leading order, using a range of renormalization and factorization scales. The fixed order predictions are compared to results obtained from matching nextto-leading order calculations to parton showers. A study of the scale dependence as a function of the jet radius is used to provide a better estimate of the scale uncertainty for small jet sizes. The non-perturbative corrections as a function of jet radius are estimated from different generators.
1 Introduction The production of a single object like a Z or Higgs boson, or a jet, at high transverse momentum has been studied intensely in hadron collider environments, both theoretically and experimentally. These processes are used for measuring standard-model parameters, to constrain parton distribution functions (PDFs), and to understand backgrounds to new physics searches. They probe the structure of the QCD interactions in great detail. On the one hand, the large scales assoa e-mail:
ciated with the production of a high- pT object make QCD perturbation theory a prime analysis tool. For H/Z + ≥ 1 jet production, the large boson mass also provides a large scale to further stabilize the QCD prediction. On the other hand, the exclusive nature of the reactions may induce logarithmically enhanced higher-order corrections, which
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