# Physics of fundamental Symmetries and Interactions - PSI2016

Oct 16 – 20, 2016
Europe/Zurich timezone

## Monte Carlo Programs for Muon Decays at NLO

Oct 18, 2016, 6:07 PM
1m
Poster Low energy precision tests of the Standard Model

### Speaker

Mr Yannick Ulrich (PSI / UZH)

### Description

Using the amplitude provided by GoSam, a tool for the automated generation of tree level and one-loop amplitudes, fully differential NLO corrections were obtained for the three decay channels of the muon: The conventional or Michel decay $\mu\to\nu\bar\nu e$, the radiative decay $\mu\to\nu\bar\nu e\gamma$ and the rare decay $\mu\to\nu\bar\nu eee$. Especially the latter two are important Standard Model backgrounds to searches for Lepton Flavour Violation at the PSI experiments MEG and Mu3e as they become indistinguishable when the neutrinos carry little energy. With our NLO program we are able to compute custom tailored observables for the experiments, especially in this region of the phase space.

### Primary author

Mr Yannick Ulrich (PSI / UZH)

 Poster