# ICHEP2012

Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

## Search for Light Higgs Bosons in \Upsilon(1S) and \Upsilon(2S) decays

Jul 6, 2012, 4:45 PM
15m
Plenary 3 (Melbourne Convention and Exhibition Centre)

### Plenary 3

#### Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 1 - The Standard Model and EW Symmetry Breaking - Higgs Searches

### Speaker

Prof. Paoti Chang (National Taiwan University (TW))

### Description

A light $CP$-odd Higgs boson $(A^0)$ is predicted in some extensions of the Standard Model; such a particle would be evident in decays of the $\Upsilon(nS)$ resonance. Using a data sample of 102 million $\Upsilon(1S)$ events and 158 million $\Upsilon(2S)$ events collected by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we search for light Higgs boson decays $A^0 \to \tau^+ \tau^-$ and $A^0 \to \mu^+ \mu^-$ in the processes $\Upsilon(1S)\to \gamma A^0$ and $\Upsilon(2S) \to \gamma A^0$.

### Primary author

Prof. Paoti Chang (National Taiwan University (TW))

 Slides