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Resumming transverse observables for NNLO+PS matching in geneva

Alessandro Gavardi1, Rebecca von Kuk1, and Matthew A. Lim2,3

Phys. Rev. D 114, 054022 – Published 11 September, 2026

DOI: https://doi.org/10.1103/nlfd-2y6w

Abstract

We study the use of higher-order resummation for transverse observables to achieve NNLO+PS matching within the geneva framework. In particular, we embed qT resummation for color-singlet production at N3LL obtained via soft-collinear effective theory and implemented in the library scetlib within geneva. We also study for the first time the use of the generalized N-jettiness variable in parton shower matching, and achieve the resummation of the one-jettiness defined with transverse measures up to NLL accuracy. As a case study, we use these resummed calculations to construct a geneva NNLO+PS generator for Higgs boson production in heavy-quark annihilation (with beauty or charm quarks in the initial state). The use of transverse measures facilitates the matching to showers ordered in transverse momentum, and opens the door to possible future extensions of this approach to the production of color singlets in association with final-state jets.

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