Probing new physics at the LHC with $\mathrm{b}\tau \nu$ final states

Abstract

The $R_{D^{(\ast )}}$ anomaly is one of the most intriguing experimental results in particle physics today. Experiments such as BaBar, Belle and LHCb have measured a consistent tension with the standard model (SM). We study several extensions of the SM that could potentially explain this tension, such as production of heavy ${\mathrm{W}}^{\prime }$ bosons, under the sequential SM scenario, leptoquarks with preferential couplings to third generation fermions, and interpretations through effective field theories. Such models, are not only able to explain the $R_{D^{(\ast )}}$ anomaly but also to produce distinctive signatures at the LHC. We present different feasibility studies to probe each of these scenarios at the LHC, considering final states with one $\mathrm{b}$-quark candidate, one hadronically decaying tau lepton (${\tau }_h$) and missing transverse momentum ($p_{\mathrm{T}}^{miss}$). The selection criteria has been optimized for each model to achieve best signal signficance. The studies are performed considering different LHC running conditions, at $\sqrt{s}=13\mathrm{TeV}$ and 13.6 $\mathrm{TeV}$, and different luminosities (150~${\mathrm{fb}}^{-1}$ and 3000~${\mathrm{fb}}^{-1}$).

Comments: 9 pages, 7 figures