ee$\in$MC: Simulation of $\bf e^{+}e^{-} \to \mu^{+} \mu^{-} (\gamma) $ and $\bf e^{+}e^{-} \to \tau^{+}\tau^{-} (\gamma) $ Events

TL;DR

This paper introduces ee∈MC, a Monte Carlo generator for simulating e+e− collisions producing muon and tau pairs, incorporating exact LO matrix elements, vacuum polarization, and detailed tau decay models, suitable for energies up to 10.58 GeV.

Contribution

The paper presents a new Monte Carlo generator with comprehensive modeling of e+e− collision processes and tau decays, including vacuum polarization and soft photon resummation, for energies up to 10.58 GeV.

Findings

Accurate simulation of e+e− → μ+μ−(γ) and τ+τ−(γ) processes.

Inclusion of vacuum polarization effects in the generator.

Detailed tau decay models including hadronic and semi-leptonic modes.

Abstract

We present a new Monte-Carlo generator, {\tt ee$\in$MC}, for the simulation of $e^{+}e^{-} \to \mu^{+} \mu^{-} (\gamma) $, $e^{+}e^{-} \to \tau^{+}\tau^{-} (\gamma) $ and $\tau$ lepton decays which is suitable for $e^{+}e^{-}$ colliders from threshold up to energy of $\sim 10.58GeV$. The $e^{+}e^{-} \to \mu^{+} \mu^{-}(\gamma) $, $e^{+}e^{-} \to \tau^{+}\tau^{-}(\gamma)$ interactions are computed up to the exact LO matrix element where the running of $\alpha_{QED}$ includes both the LO leptonic and hadronic vacuum polarization. Infra-red divergences are investigated within the Yennie-Frautschi-Suura Exponentiation formalism, where several well-known approximations and a formulation based on the exact LO contribution to the soft and virtual photons are applied. The simulation of the $\tau$ lepton consists of the leptonic decay modes at Born level and theoretical models based on Flux-Tube Breaking Models and Chiral Resonance Lagrangian Models as well as experimental models for the majority of semi-leptonic decay modes. This includes hadronic models for investigating the origin of low mass scalar sector recently observed in decays of the $\tau$ lepton and their association with the origin of the constituent-quark mass through Chiral-symmetry Breaking.