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

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, τ\to ν_τ+π, 2π, and 3π, 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.

10 pages, 12 figures, 3 tables; v2: typo in Eq.(20b) corrected, references added, version accepted by EPJC. 'Note added' also included for the brief TauDecay instruction in MadGraph5_aMC@NLO

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• Probing the CP-Violation effects in the $h\tau \tau$ coupling at the LHC
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• Flavor changing top decays to charm and Higgs with $\tau \tau$ at the LHC
• Direct measurement of the Higgs self-coupling in $e^{+}{e}^{-}\to ZH$
• Higgs data constraints on the minimal supersymmetric standard model
• Exploring CP phase in $\tau$-lepton Yukawa coupling in Higgs decays at the LHC
• Probing chirality structure in lepton-flavour-violating Higgs decay $h\to \tau \mu$ at the LHC
• Big-bang nucleosynthesis and Leptogenesis in CMSSM
• Constraints on $\tau$ electromagnetic moments via tau pair production at the Muon colliders
• Probing doubly charged scalar bosons from the doublet at future high-energy colliders
• Measuring $CP$ nature of $h\tau \bar{\tau }$ coupling at $e^{-}p$ collider
• Tau reconstruction methods at an electron-positron collider in the search for new physics
• Prospects of measuring quantum entanglement in $\tau \tau$ final states at a future $e^{+}{e}^{-}$ Higgs factory
• Searching for long-lived axion-like particles via displaced vertices at the HL-LHC
• Determining Strong Phase of $a_1$ Meson Decay Amplitude using $W\to \nu \tau (\to \nu a_1(\to {\pi }^{\mp }{\pi }^{\mp }{\pi }^{\pm }))$ Process
• UFO 2.0 -- The Universal Feynman Output format