Transverse-momentum resummation for gaugino-pair production at hadron colliders

TL;DR

This paper provides a high-precision analysis of the transverse-momentum spectrum for gaugino pairs at hadron colliders, using a resummation formalism matched to perturbative predictions, with implications for supersymmetry parameter determination.

Contribution

It introduces a universal resummation formalism at next-to-leading logarithmic accuracy for gaugino-pair production, improving upon traditional Monte Carlo predictions.

Findings

Resummation results differ significantly from Monte Carlo predictions.

The analysis impacts the extraction of supersymmetric mass parameters.

Theoretical uncertainties from scale, PDFs, and non-perturbative effects are quantified.

Abstract

We present a first precision analysis of the transverse-momentum spectrum of gaugino pairs produced at the Tevatron and the LHC with center-of-mass energies of 1.96 and 10 or 14 TeV, respectively. Our calculation is based on a universal resummation formalism at next-to-leading logarithmic accuracy, which is consistently matched to the perturbative prediction at ${\cal O}(\alpha_s)$. Numerical results are given for the "gold-plated" associated production of neutralinos and charginos decaying into three charged leptons with missing transverse energy as well as for the pair production of neutralinos and charginos at two typical benchmark points in the constrained Minimal Supersymmetric Standard Model. We show that the matched resummation results differ considerably from the Monte Carlo predictions employed traditionally in experimental analyses and discuss the impact on the determination of supersymmetric mass parameters from derived transverse-mass spectra. We also investigate in detail the theoretical uncertainties coming from scale and parton-density function variations and non-perturbative effects.