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High Energy Physics - Phenomenology

arXiv:1508.01475 (hep-ph)
[Submitted on 6 Aug 2015]

Title:Drell-Yan Production at NNLL'+NNLO Matched to Parton Showers

Authors:Simone Alioli, Christian W. Bauer, Calvin Berggren, Frank J. Tackmann, Jonathan R. Walsh
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Abstract:We present results for Drell-Yan production from the GENEVA Monte-Carlo framework. We combine the fully-differential NNLO calculation with higher-order resummation in the 0-jettiness resolution variable. The resulting parton-level events are further combined with parton showering and hadronization provided by PYTHIA8. The 0-jettiness resummation is carried out to NNLL', which consistently incorporates all singular virtual and real NNLO corrections. It thus provides a natural perturbative connection between the NNLO calculation and the parton shower regime, including a systematic assessment of perturbative uncertainties. In this way, inclusive observables are correct to NNLO, up to small power corrections in the resolution cutoff. Furthermore, the perturbative accuracy of 0-jet-like resummation variables is significantly improved beyond the parton shower approximation. We provide comparisons with LHC measurements of Drell-Yan production at 7 TeV from ATLAS, CMS, and LHCb. As already observed in $e^+e^-$ collisions, for resummation-sensitive observables, the agreement with data is noticeably improved by using a lower value of $\alpha_s(M_Z) = 0.1135$.
Comments: 26 pages, 20 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:1508.01475 [hep-ph]
  (or arXiv:1508.01475v1 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1508.01475
Journal reference: Phys. Rev. D 92, 094020 (2015)
Related DOI: https://doi.org/10.1103/PhysRevD.92.094020

Submission history

From: Simone Alioli [view email]
[v1] Thu, 6 Aug 2015 18:02:46 UTC (1,084 KB)
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