TauDecay: a library to simulate polarized tau decays via FeynRules and MadGraph5

TL;DR

TauDecay is a computational library that enables detailed simulation of polarized tau decays, including hadronic modes, using FeynRules and MadGraph5, facilitating studies of tau decay correlations in high-energy physics.

Contribution

The paper introduces a new library, TauDecay, which models polarized tau decays with effective vertices for hadronic modes within FeynRules and MadGraph5, allowing simulations beyond on-shell tau production.

Findings

Successfully integrated hadronic tau decay modes as effective vertices.

Automatically generates correlations among decay products of pair-produced taus.

Validated the library against the standard Tauola decay library.

Abstract

TauDecay is a library of helicity amplitudes to simulate polarized tau decays, constructed in the FeynRules and MadGraph5 framework. Together with the leptonic mode, the decay library includes the main hadronic modes, \tau \to \nu_{\tau}+\pi, 2\pi, and 3\pi, which are introduced as effective vertices by using FeynRules. The model file allows us to simulate tau decays when the on-shell tau production is kinematically forbidden. We also demonstrate that all possible correlations among the decay products of pair-produced taus through a Z boson and a scalar/pseudoscalar Higgs boson are produced automatically. The program has been tested carefully by making use of the standard tau decay library Tauola.