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arXiv · 1508.01475

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

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 $α_s(M_Z) = 0.1135$.

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Simone Alioli, Christian W. Bauer, Calvin Berggren, Frank J. Tackmann, Jonathan R. Walsh. 2015-08-06. Drell-Yan Production at NNLL'+NNLO Matched to Parton Showers. https://doi.org/10.1103/physrevd.92.094020

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