Simulation of $Z$-boson $p_{T}$ spectrum at LHC and Tevatron using GR@PPA

TL;DR

This paper evaluates the GR@PPA event generator's ability to simulate the $Z$-boson $p_T$ spectrum at LHC and Tevatron, showing reasonable agreement with experimental data and highlighting the effectiveness of leading-order simulations.

Contribution

It demonstrates that leading-order simulations with a primitive parton shower can reasonably reproduce the $Z$-boson $p_T$ spectrum without higher-order corrections.

Findings

Simulation agrees with measurements in most regions.

Marginal discrepancies at high $p_T$.

Leading-order approach is sufficiently accurate.

Abstract

Predictions from the GR@PPA event generator concerning the transverse-momentum ($p_{T}$) spectrum of $Z$ bosons are compared with recent measurements at LHC and Tevatron. The simulation results are in reasonable agreement with the measurements, although marginal discrepancies are observed in high-$p_{T}$ regions. The principal agreements imply that the leading-order simulation with a primitive parton shower based on the leading-logarithmic approximation still provides a reasonable description of the transverse motion of the hard-interaction system in hadron collisions, without the need to introduce noble techniques to incorporate higher-order corrections.