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28-31 October 2014
Waldhotel Zollernblick
Europe/Berlin timezone

Search for the Rare Decay $B^0 \to \tau^+ \tau^-$ at Belle

28 Oct 2014, 17:10
20m
Waldhotel Zollernblick

Waldhotel Zollernblick

Am Zollernblick 1 72250 Freudenstadt - Lauterbad http://www.zollernblick-lauterbad.de/

Speaker

Michael Ziegler (EKP)

Description

In the Standard Model the decay $B^0 \to \tau^+ \tau^-$ is highly suppressed with a predicted branching ratio of $\mathcal{B}_{\rm{SM}}(B^0 \to \tau^+ \tau^-) \approx 3 \times 10^{-8}$. The BaBar collaboration estimated an upper limit of $\mathcal{B}< 4.1 \times 10^{-3}$ at the 90\% confidence level using a data sample of $232 \times 10^6$ $B\bar B$ pairs. The search presented in this talk is performed on data collected on the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The data sample contains $772 \times 10^6$ $B\bar B$ pairs, which is a factor three more than used in the BaBar analysis. For the analysis one of the $B$ mesons is fully reconstructed in hadronic decay modes using a hierarchical NeuroBayes-based algorithm. Using a multivariate analysis method the background is reduced to reach higher sensitivity. An expected upper limit on the branching ratio is estimated on simulated Monte Carlo events.

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