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Improving TauFinder Reconstruction at a 10 TeV Muon Collider with the MAIA Detector Concept

Cyrus Kianian, Moses Glassman, Abdollah Mohammadi

TL;DR

This work tackles the challenge of reconstructing hadronically decaying taus at a 10 TeV muon collider by enhancing the TauFinder algorithm within the MAIA detector framework. It introduces a $p_T$-dependent shrinking cone, extends tau decay coverage to include 1P+N via a pseudo-$\\pi^0$ criterion, and implements an electron-rejection tagger using an $\\frac{E}{E+H}$ cut, achieving near-perfect electron suppression with minimal loss of true taus. Quantitatively, the shrinking cone reduces low-$p_T$ $\\tau$ migration by about 20% and boosts 3-prong efficiency; the pseudo-$\\pi^0$ treatment improves neutral-decay handling, and the electron cut lowers electron fakes to around $0.06\%$ while preserving $1P$ efficiency. Collectively, these advances enhance tau reconstruction performance in MAIA, supporting precise Higgs and beyond-Standard-Model studies at future high-energy muon colliders.

Abstract

This study aims to improve the TauFinder reconstruction algorithm for the MAIA detector concept. Through this work, we seek to increase the reconstruction efficiency and identification of hadronically decaying tau leptons. Through our work, we introduce a dynamic signal cone, known as a shrinking cone, which adjusts its size based on the transverse momentum of the tau candidate. In addition to the already studied one charged hadron and three charged hadron decay modes we extend TauFinder to include decays that consist of one charged hadron and up to two neutral pions. Furthermore, we have developed a tagger that prevents electrons being misidentified as one-prong tau candidates. Applying this tagger results in near-perfect electron rejection with negligible decrease in one-prong tau reconstruction efficiency.

Improving TauFinder Reconstruction at a 10 TeV Muon Collider with the MAIA Detector Concept

TL;DR

This work tackles the challenge of reconstructing hadronically decaying taus at a 10 TeV muon collider by enhancing the TauFinder algorithm within the MAIA detector framework. It introduces a -dependent shrinking cone, extends tau decay coverage to include 1P+N via a pseudo- criterion, and implements an electron-rejection tagger using an cut, achieving near-perfect electron suppression with minimal loss of true taus. Quantitatively, the shrinking cone reduces low- migration by about 20% and boosts 3-prong efficiency; the pseudo- treatment improves neutral-decay handling, and the electron cut lowers electron fakes to around while preserving efficiency. Collectively, these advances enhance tau reconstruction performance in MAIA, supporting precise Higgs and beyond-Standard-Model studies at future high-energy muon colliders.

Abstract

This study aims to improve the TauFinder reconstruction algorithm for the MAIA detector concept. Through this work, we seek to increase the reconstruction efficiency and identification of hadronically decaying tau leptons. Through our work, we introduce a dynamic signal cone, known as a shrinking cone, which adjusts its size based on the transverse momentum of the tau candidate. In addition to the already studied one charged hadron and three charged hadron decay modes we extend TauFinder to include decays that consist of one charged hadron and up to two neutral pions. Furthermore, we have developed a tagger that prevents electrons being misidentified as one-prong tau candidates. Applying this tagger results in near-perfect electron rejection with negligible decrease in one-prong tau reconstruction efficiency.
Paper Structure (9 sections, 2 equations, 10 figures)

This paper contains 9 sections, 2 equations, 10 figures.

Table of Contents

  1. Introduction
  2. Methodology
  3. $\tau$ Reconstruction Study
  4. Electron Rejection Study
  5. Results $\And$ Discussion
  6. Initial Changes $\And$ Shrinking Cone
  7. New Decay Modes
  8. Electron Rejection
  9. Conclusions

Figures (10)

  • Figure 2: $\tau$$E_{iso}$ vs. true $p_{T}$.
  • Figure 3: $\tau$$M_{inv}$ vs. true $p_{T}$.
  • Figure 4: 3P reconstruction efficiency vs. $p_{T}$.
  • Figure 5: 3P migration rate vs. $p_{T}$.
  • Figure 6: 1-Prong + $\pi^{0}$s efficiency vs. $p_{T}$.
  • ...and 5 more figures