# ICHEP2018 SEOUL

Jul 4 – 11, 2018
COEX, SEOUL
Asia/Seoul timezone

## Search for the forbidden charm meson decays $D^0\to hh'll’$

Not scheduled
15m
203 (COEX, Seoul)

### 203

#### COEX, Seoul

Parallel Beyond the Standard Model

### Speaker

Fergus Wilson (Science and Technology Facilities Council STFC (GB))

### Description

Decay modes with two oppositely charged leptons of different flavor correspond to lepton flavor violating (LFV) decays and are essentially forbidden in the Standard Model (SM) because they can occur only through lepton mixing. Decay modes with two leptons of the same charge are lepton-number violating (LNV) decays and are forbidden in the SM. Hence, decays of the form $D^0 \to hh'll’$ provide sensitive tools to investigate new mediators or couplings in physics beyond the SM.
$D$-mesons were copiously produced in $e^+e^-\to c\bar{c}$ continuum events at the PEP-II $e^+e^-$ collider at the SLAC National Accelerator Laboratory. In this talk, we report on a search for the three LFV and nine LNV decays of the type $D^0\to hh'll’$ (with $h,h'=K/\pi$ and $l,l’=e/\mu$) using data taken by the BABAR experiment which had comparable sensitivity to both muons and electrons in the final state. Upper limits on the branching fractions are improved by up to two orders of magnitude.

### Primary authors

Fabio Anulli (Sapienza Universita e INFN, Roma I (IT)) Fergus Wilson (Science and Technology Facilities Council STFC (GB))

### Presentation materials

There are no materials yet.