DYTurbo: Fast predictions for Drell-Yan processes

TL;DR

DYTurbo is a new computational tool that provides fast, precise predictions for Drell-Yan processes at hadron colliders, crucial for SM tests and new physics searches, by combining advanced QCD resummation with fixed-order calculations.

Contribution

It introduces DYTurbo, an improved, efficient reimplementation of existing programs, enabling rapid and accurate Drell-Yan cross section predictions with full kinematic and spin correlations.

Findings

DYTurbo achieves faster computation times compared to previous tools.

It maintains high numerical precision in predictions.

The program incorporates full kinematic dependence and spin effects.

Abstract

Drell-Yan lepton pair production processes are extremely important for Standard Model (SM) precision tests and for beyond the SM searches at hadron colliders. Fast and accurate predictions are essential to enable the best use of the precision measurements of these processes; they are used for parton density fits, for the extraction of fundamental parameters of the SM, and for the estimation of background processes in searches. This paper describes a new numerical program, DYTurbo, for the calculation of the QCD transverse-momentum resummation of Drell-Yan cross sections up to next-to-next-to-leading logarithmic accuracy combined with the fixed-order results at next-to-next-to-leading order ($\mathcal{O}(\alpha_{\mathrm{S}}^2)$), including the full kinematical dependence of the decaying lepton pair with the corresponding spin correlations and the finite-width effects. The DYTurbo program is an improved reimplementation of the DYqT, DYqT and DYNNLO programs, which provides fast and numerically precise predictions through the factorisation of the cross section into production and decay variables, and the usage of quadrature rules based on interpolating functions for the integration over kinematic variables.