Flavor tagging TeV jets for BSM and QCD

TL;DR

This paper introduces the $x$ muon-based flavor tagging scheme for high-energy jets, maintaining efficiency and rejection capabilities at TeV scales, and demonstrates its application in heavy resonance searches.

Contribution

The paper presents a novel $x$ tagging method that remains effective at TeV jet energies, overcoming limitations of track-based tags.

Findings

$x$ tags 14% of $b$ jets in the 0.5-2.1 TeV range

$x$ tags 6.5% of $c$ jets in the same range

$x$ tags 0.65% of light jets

Abstract

We present a new scheme for tagging high-$p_{T}$ bottom and charm jets using energetic muons. Contemporary track-based $b$ tags lose their ability to reject light jet background as jet $p_{T}\rightarrow\mathcal{O}(\mathrm{TeV})$, where the massive boost exposes fundamental limits in tracking resolution. For our "$\mu_{x}$" tag, the signal efficiency and light jet rejection is robust versus $p_{T}$. In the tested regime (jet $p_{T}\in[\mathrm{0.5,2.1}]$ TeV), $\mu_{x}$ tags $\sim14\%$ of $b$ jets, $\sim6.5\%$ of $c$ jets and $\sim0.65\%$ of light jets. Since $\mu_{x}$ tagging should be immediately useful in a searches for heavy resonances, we test it with a typical dijet search --- a heavy, leptophobic $Z^{\prime}$.