Tau-pair Invariant Mass Estimation Using Maximum Likelihood Estimation and Collinear Approximation
Wiktor Matyszkiewicz, Artur Kalinowski · Acta Physica Polonica B Proceedings Supplement · 2025
Reconstruction of the invariant mass of the system with two tau leptons faces a challenge of lack of neutrinos in the observed final state of taus’ decays. In this work, we introduce a novel algorithm, which is comparable to other mass reconstruction algorithms in the field of mass resolution and much better considering time performance. We test its performance on Monte Carlo simulations with PYTHIA and Delphes and show that algorithm achieves an average execution time of approximately 3 ms per event, which is around two orders of magnitude faster than previous techniques, while delivering a mass resolution characterized by a standard deviation of \(22\) GeV for \(Z^0\) bosons and \(34.5\) GeV for Higgs bosons. A Python implementation of the method is provided in an open-source repository, facilitating broader adoption in high-energy physics analyses. Abstract Published by the Jagiellonian University 2025 authors