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Simulated NNLO for high-p T observables in vector boson + jets production at the LHC

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Abstract

We present a study of higher-order QCD corrections beyond NLO to processes with an electroweak vector boson, W or Z, in association with jets. We focus on the regions of high transverse momenta of commonly used differential distributions. We employ the LoopSim method to merge NLO samples of different multiplicity obtained from mcfm and from blackhat+sherpa in order to compute the dominant part of the NNLO corrections for high-p T observables. We find that these corrections are indeed substantial for a number of experimentally relevant observables. For other observables, they lead to significant reduction of scale uncertainties.

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Notes

  1. This does not imply that there are no significant contributions coming from constant terms of the 2-loop diagrams, as we discuss further in this section.

  2. As mentioned earlier, whenever we write “W+jets” we really mean the sum: W++jets + W−+jets.

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Acknowledgements

We thank Gavin Salam for numerous discussions during this work and for subsequent comments on the manuscript. We are grateful to Ulla Blumenschein and Joey Huston for useful conversations, clarifying a number of experimental issues, and for critical reading of the manuscript. We acknowledge valuable discussions with Stefano Camarda and Nicolas Meric at various stages of this work. We are grateful to Graeme Watt for pointing us to relevant findings concerning ratios of W and Z cross sections. We thank Alberto Guffanti and Pavel Storovoitov for smooth collaboration on the extensions of mcfm, and the mcfm authors for including these new features in the next release. We thank the blackhat+sherpa authors for providing us with the root ntuples. We acknowledge correspondence with Alexander Paramonov concerning experimental details of the W+jets results from ATLAS. D.M.’s work was supported by the Research Executive Agency (REA) of the European Union under the Grant Agreement number PITN-GA-2010-264564 (LHCPhenoNet).

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  1. Institute for Particle Physics Phenomenology, Durham University, South Rd, Durham, DH1 3LE, UK

    Daniel Maître & Sebastian Sapeta

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Maître, D., Sapeta, S. Simulated NNLO for high-p T observables in vector boson + jets production at the LHC. Eur. Phys. J. C 73, 2663 (2013). https://doi.org/10.1140/epjc/s10052-013-2663-8

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