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Precise predictions for $$V+$$ V + jets dark matter backgrounds

Jonas M. Lindert1Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE UKStefano Pozzorini2Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zurich, SwitzerlandRadja Boughezal3High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439 USAJohn M. Campbell4Fermilab, P.O.Box 500, Batavia, IL 60510 USAAnsgar Denner5Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, GermanyS. Dittmaier6Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, GermanyA. Gehrmann–De Ridder2Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zurich, SwitzerlandT. Gehrmann2Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zurich, SwitzerlandE. W. N. Glover1Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE UKAlexander Huss7Institute for Theoretical Physics, ETH, 8093 Zurich, SwitzerlandStefan Kallweit8Theoretical Physics Department, CERN, 1211 Geneva 23, SwitzerlandPhilipp Maierhöfer6Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, GermanyMichelangelo L. Mangano8Theoretical Physics Department, CERN, 1211 Geneva 23, SwitzerlandThomas A. Morgan1Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE UKAlexander Mück9Institut für Theoretische Teilchenphysik und Kosmologie, RWTH Aachen University, 52056 Aachen, GermanyF. Petriello10Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208 USAGavin P. Salam8Theoretical Physics Department, CERN, 1211 Geneva 23, SwitzerlandMarek Schönherr2Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zurich, SwitzerlandCiaran Williams11Department of Physics, University at Buffalo, The State University of New York, Buffalo, 14260 USA

2017en

ABI

Annotatsiya

High-energy jets recoiling against missing transverse energy (MET) are powerful probes of dark matter at the LHC. Searches based on large MET signatures require a precise control of the Z ( )+ jet background in the signal region. This can be achieved by taking accurate data in control regions dominated by Z ( + -)+ jet, W ( )+ jet and + jet production, and extrapolating to the Z ( )+ jet background by means of precise theoretical predictions. In this context, recent advances in perturbative calculations open the door to significant sensitivity improvements in dark matter searches. In this spirit, we present a combination of state-of-the-art calculations for all relevant V + jets processes, including throughout NNLO QCD corrections and NLO electroweak corrections supplemented by Sudakov logarithms at two loops. Predictions at parton level are provided together with detailed recommendations for their usage in experimental analyses based on the reweighting of Monte Carlo samples. Particular attention is devoted to the estimate of theoretical uncertainties in the framework of dark matter searches, where subtle aspects such as correlations across different V + jet processes play a key role. The anticipated theoretical uncertainty in the Z ( )+ jet background is at the few percent level up to the TeV range.

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DOI: 10.1140/epjc/s10052-017-5389-1

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