Flavor tagging TeV jets for BSM and QCD

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 $p_T\to \mathcal{O}(\mathrm{T}\mathrm{e}\mathrm{V})$, 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 $p_T\in [0.5,2.1]$ TeV), ${\mu }_x$ tags $\sim 14\mathrm{\%}$ of $b$ jets, $\sim 6.5\mathrm{\%}$ of $c$ jets and $\sim 0.65\mathrm{\%}$ 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 $Z^{\mathrm{\prime }}$.