2$b$ or not 2$b$: on the rejection of $g\to b\bar b$ jets

TL;DR

This paper proposes a novel jet tagging strategy to distinguish bottom-quark jets from other jets, improving background suppression in searches for new physics involving multiple heavy quarks.

Contribution

It introduces a new method leveraging properties of parton showers and gluon fragmentation to effectively identify bottom-quark jets in high-multiplicity final states.

Findings

Enhanced ability to reject non-bottom jets in simulated data

Improved background suppression in multi-jet events

Potential application in new physics searches involving heavy quarks

Abstract

Motivated by new physics models which lead to final states containing a high multiplicity of bottom and top quarks, we develop a tagging strategy to suppress reducible and non-reducible multi-jet backgrounds. The idea takes advantage of the properties of light parton showers and of the gluon fragmentation into heavy quarks to reject jets that do not originate from a bottom quark.