Precise predictions for V+jets dark matter backgrounds : arXiv

Lindert, J.M.; Pozzorini, S.; Maierhöfer, P.; Schönherr, M.; Mangano, M.L.; Boughezal, R.; Mück, A.; Gehrmann-De Ridder, A.; Morgan, T.A.; Petriello, F.; Denner, A.; Kallweit, S.; Williams, C.; Gehrmann, T.; Campbell, J.M.; Salam, G.P.; Glover, N.; Huss, A.; Dittmaier, S.

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

Published Articles
Report number	arXiv:1705.04664 ; CERN-TH-2017-102 ; CERN-LPCC-2017-02 ; IPPP-17-38 ; FERMILAB-PUB-17-152-T ; ZU--TH-12-17
Title	Precise predictions for V+jets dark matter backgrounds
Related title	Precise predictions for V+jets dark matter backgrounds
Author(s)	Lindert, J.M. (Durham U., IPPP ; Durham U.) ; Pozzorini, S. (Zurich U.) ; Boughezal, R. (Argonne) ; Campbell, J.M. (Fermilab) ; Denner, A. (Wurzburg U.) ; Dittmaier, S. (Freiburg U.) ; Gehrmann-De Ridder, A. (Zurich U. ; Zurich, ETH) ; Gehrmann, T. (Zurich U.) ; Glover, N. (Durham U., IPPP) ; Huss, A. (Zurich, ETH) ; Kallweit, S. (CERN) ; Maierhöfer, P. (Freiburg U.) ; Mangano, M.L. (CERN) ; Morgan, T.A. (Durham U., IPPP) ; Mück, A. (RWTH Aachen U.) ; Petriello, F. (Argonne ; Northwestern U.) ; Salam, G.P. (CERN) ; Schönherr, M. (Zurich U.) ; Williams, C. (SUNY, Buffalo)
Publication	2017-12-05
Imprint	2017-05-12
Number of pages	36
Note	32 pages + appendices, 21 figures. V2: NNLO QCD predictions and uncertainties included troughout; improved methodology for mixed QCD-EW uncertainties; more realistic NLO EW uncertainty in eq. (57); photon-induced processes estimated at NLO QCD; PDF uncertainties made publicly available; discussion of numerical results extended; overall presentation improved and streamlined
In:	Eur. Phys. J. C 77 (2017) 829
DOI	10.1140/epjc/s10052-017-5389-1
Subject category	hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Abstract	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 $Z(\nu\bar\nu)+$jet background in the signal region. This can be achieved by taking accurate data in control regions dominated by $Z(\ell^+\ell^-)+$jet, $W(\ell\nu)+$jet and $\gamma+$jet production, and extrapolating to the $Z(\nu\bar\nu)+$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 $Z(\nu\bar\nu)+$jet background is at the few percent level up to the TeV range.
Copyright/License	arXiv nonexclusive-distrib. 1.0

$Production rates for $V+$\,jet(s), for various decay channels, as a function of the minimum $p_\rT$ of the vector boson. Decays into $\ell^\pm=e^\pm,\mu^\pm$ and $\nu_e,\nu_\nu,\nu_\tau$ are included. The number of events, $N$, is normalized to 300\,fb$^{-1}$ of LHC data at $\sqrt{s}=13$\,TeV, and includes the basic selection cuts listed in the main body of the paper. The log lower panel shows the statistical uncertainties, calculated as $1/\sqrt{N}$. The gray band in the lower panel indicates the regime of 1--10\% statistical uncertainty.$ $Comparison of NLO QCD $K$-factors (left) for $W+$\,jet, $Z+$\,jet, and $\gamma+$\,jet production with dynamic photon isolation~\refpar{eq:dynisolation} and standard fixed-cone isolation~\refpar{eq:standard_isolation_parameters}. On the right corresponding ratios of $K$-factors are shown, and the dotted lines indicate $K$-factor variations of $\pm 0.05$.$ $Comparison of NLO QCD $K$-factors (left) for $W+$\,jet, $Z+$\,jet, and $\gamma+$\,jet production with dynamic photon isolation~\refpar{eq:dynisolation} and standard fixed-cone isolation~\refpar{eq:standard_isolation_parameters}. On the right corresponding ratios of $K$-factors are shown, and the dotted lines indicate $K$-factor variations of $\pm 0.05$.$ Show more plots

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