DYTurbo: fast predictions for Drell–Yan processes

CAMARDA, STEFANO; BOZZI, GIUSEPPE; CATANI, STEFANO; CIERI, LEANDRO; FERRERA, GIANCARLO; DE FLORIAN, DANIEL; GRAZZINI, MASSIMILIANO

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

SPRINGER

Lugar: Berlin; Año: 2020 vol. 80

1434-6044

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 param- eters of the SM, and for the estimation of background pro- cesses in searches. This paper describes a new numerical pro- gram, 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 (O(αS2)), including the full kinematical dependence of the decaying lepton pair with the corresponding spin correla- tions and the finite-width effects. The DYTurbo program is an improved reimplementation of the DYqT, DYRes and DYNNLO programs, which provides fast and numerically pre- cise predictions through the factorisation of the cross section into production and decay variables, and the usage of quadra- ture rules based on interpolating functions for the integration over kinematic variables.