Double Parton Scattering Effect on the Measurement of $W$-Boson Mass

TL;DR

This paper investigates how double parton scattering (DPS) events can influence the measurement of the W-boson mass, potentially explaining deviations observed in experimental results from the Standard Model predictions.

Contribution

The study quantifies the impact of DPS effects on W-boson mass measurements and suggests they may account for observed discrepancies in experimental data.

Findings

DPS contributes additional missing transverse momentum affecting measurements.

DPS effects can increase the measured W-boson mass.

DPS may explain deviations in CDF-II W-mass results.

Abstract

Double parton scattering (DPS) corresponds to events where two parton-parton scatterings occur in a single hadron-hadron collision. The DPS effects may arise from the spectator scatterings that are somewhat related to soft QCD activities. In this work, we investigate the DPS effects on the $W$-boson mass measurements. Especially, our analysis reveals that the DPS events contribute additional missing transverse momenta from spectator scatterings as well as relevant inclusive cross sections, potentially altering the distribution of total missing transverse momenta. Consequently, the DPS effects have the potential to cause an increase in the measured $W$-boson mass by the CDF detector, which helps to understand the deviation of the CDF-II measurements from other measurements and the predicted value in the Standard Model.