Transverse-momentum resummation for gaugino-pair production at the LHC

TL;DR

This paper provides a high-precision analysis of the transverse-momentum distribution of gaugino pairs at the LHC, using advanced resummation techniques to improve upon traditional Monte Carlo predictions.

Contribution

It introduces a next-to-leading logarithmic resummation formalism matched to fixed-order calculations for gaugino-pair production at the LHC.

Findings

Resummation results significantly differ from Monte Carlo predictions.

Theoretical uncertainties from scale and PDF variations are quantified.

Non-perturbative effects are also analyzed.

Abstract

We present a first precision analysis of the transverse-momentum spectrum of gaugino pairs produced at the LHC with center-of-mass energies of 10 or 14 TeV. Our calculation is based on a universal resummation formalism at next-to-leading logarithmic accuracy, which is consistently matched to the perturbative prediction at O(alpha_s). Numerical results are given for the ``gold-plated'' associated production of neutralinos and charginos for a typical benchmark point 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. We also investigate in detail the theoretical uncertainties coming from scale and parton-density function variations and non-perturbative effects.