Abstract
We consider Drell-Yan production pp → Z/γ∗ → ℓ+ℓ− with the simultaneous measurement of the Z-boson transverse momentum qT and 0-jettiness \( {\mathcal{T}}_0 \). Since both observables resolve the initial-state QCD radiation, the double-differential cross section in qT and \( {\mathcal{T}}_0 \) contains Sudakov double logarithms of both qT/Q and \( {\mathcal{T}}_0/Q \), where Q ∼ mZ is the dilepton invariant mass. We simultaneously resum the logarithms in qT and \( {\mathcal{T}}_0 \) to next-to-next-to-leading logarithmic order (NNLL) matched to next-to-leading fixed order (NLO). Our results provide the first genuinely two-dimensional analytic Sudakov resummation for initial-state radiation. Integrating the resummed double-differential spectrum with an appropriate scale choice over either \( {\mathcal{T}}_0 \) or qT recovers the corresponding single-differential resummation for the remaining variable. We discuss in detail the required effective field theory setups and their combination using two-dimensional resummation profile scales. We also introduce a new method to perform the qT resummation where the underlying resummation is carried out in impact-parameter space, but is consistently turned off depending on the momentum-space target value for qT. Our methods apply at any order and for any color-singlet production process, such that our results can be systematically extended when the relevant perturbative ingredients become available.
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Lustermans, G., Michel, J.K.L., Tackmann, F.J. et al. Joint two-dimensional resummation in qT and 0-jettiness at NNLL. J. High Energ. Phys. 2019, 124 (2019). https://doi.org/10.1007/JHEP03(2019)124
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DOI: https://doi.org/10.1007/JHEP03(2019)124