Jets plus Missing Energy with an Autofocus

TL;DR

This paper introduces a novel analysis strategy for jets plus missing energy searches at the LHC, utilizing jet merging and staircase scaling to better understand QCD backgrounds and infer properties of potential new physics.

Contribution

It proposes using jet merging and staircase scaling measurements to improve background modeling and extract information about new physics without relying on specific models.

Findings

Staircase scaling describes jet multiplicities in background channels.

The method predicts effective mass distributions for Standard Model backgrounds.

Analysis strategy can infer color charge and mass scale of new physics.

Abstract

Jets plus missing transverse energy is one of the main search channels for new physics at the LHC. A major limitation lies in our understanding of QCD backgrounds. Using jet merging we can describe the number of jets in typical background channels in terms of a staircase scaling, including theory uncertainties. The scaling parameter depends on the particles in the final state and on cuts applied. Measuring the staircase scaling will allow us to also predict the effective mass for Standard Model backgrounds. Based on both observables we propose an analysis strategy avoiding model specific cuts which returns information about the color charge and the mass scale of the underlying new physics.