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

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. In conclusion, the anticipated theoretical uncertainty in the $$Z(\nu\bar\nu)+$$jet background is at the few percent level up to the TeV range.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [2] ;  [1] ;  [8] ;  [9] ;  [6] ;  [9] ;  [1] ;  [10] ;  [11] ;  [9] ;  [2] ;  [12]
  1. Univ. of Durham, Durham (United Kingdom)
  2. Univ. Zurich, Zurich (Switzerland)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  5. Univ. Wurzburg, Wurzburg (Germany)
  6. Albert-Ludwigs-Univ. Freiburg, Freiburg (Germany)
  7. Univ. Zurich, Zurich (Switzerland); ETH, Zurich (Switzerland)
  8. ETH, Zurich (Switzerland)
  9. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  10. RWTH Aachen Univ., Aachen (Germany)
  11. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
  12. Univ. at Buffalo, The State Univ. of New York, Buffalo, NY (United States)
Publication Date:
Report Number(s):
CERN-TH-2017-102; CERN-LPCC-2017-02; IPPP-17-38; FERMILAB-PUB-17-152-T; ZU-TH-12-17; arXiv:1705.04664
Journal ID: ISSN 1434-6044; 1599401
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 12; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1367906

Lindert, Jonas M., Pozzorini, S., Boughezal, R., Campbell, J. M., Denner, A., Dittmaier, S., Gehrmann-De Ridder, A., Gehrmann, T., Glover, N., Huss, A., Kallweit, S., Maierhofer, P., Mangano, M. L., Morgan, T. A., Muck, A., Petriello, F., Salam, G. P., Schonherr, M., and Williams, C.. Precise predictions for $V+$jets dark matter backgrounds. United States: N. p., Web. doi:10.1140/epjc/s10052-017-5389-1.
Lindert, Jonas M., Pozzorini, S., Boughezal, R., Campbell, J. M., Denner, A., Dittmaier, S., Gehrmann-De Ridder, A., Gehrmann, T., Glover, N., Huss, A., Kallweit, S., Maierhofer, P., Mangano, M. L., Morgan, T. A., Muck, A., Petriello, F., Salam, G. P., Schonherr, M., & Williams, C.. Precise predictions for $V+$jets dark matter backgrounds. United States. doi:10.1140/epjc/s10052-017-5389-1.
Lindert, Jonas M., Pozzorini, S., Boughezal, R., Campbell, J. M., Denner, A., Dittmaier, S., Gehrmann-De Ridder, A., Gehrmann, T., Glover, N., Huss, A., Kallweit, S., Maierhofer, P., Mangano, M. L., Morgan, T. A., Muck, A., Petriello, F., Salam, G. P., Schonherr, M., and Williams, C.. 2017. "Precise predictions for $V+$jets dark matter backgrounds". United States. doi:10.1140/epjc/s10052-017-5389-1. https://www.osti.gov/servlets/purl/1367906.
@article{osti_1367906,
title = {Precise predictions for $V+$jets dark matter backgrounds},
author = {Lindert, Jonas M. and Pozzorini, S. and Boughezal, R. and Campbell, J. M. and Denner, A. and Dittmaier, S. and Gehrmann-De Ridder, A. and Gehrmann, T. and Glover, N. and Huss, A. and Kallweit, S. and Maierhofer, P. and Mangano, M. L. and Morgan, T. A. and Muck, A. and Petriello, F. and Salam, G. P. and Schonherr, M. and Williams, C.},
abstractNote = {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. In conclusion, the anticipated theoretical uncertainty in the $Z(\nu\bar\nu)+$jet background is at the few percent level up to the TeV range.},
doi = {10.1140/epjc/s10052-017-5389-1},
journal = {European Physical Journal. C, Particles and Fields},
number = 12,
volume = 77,
place = {United States},
year = {2017},
month = {12}
}