Higgs to Four Taus at ALEPH

Abstract

A search has been performed on 683 pb${}^{-1}$ of data collected by the ALEPH detector at the Large Electron-Positron (LEP), collider at centre-of-mass energies from 183 to 209 $\mathrm{GeV}$ looking for a Higgs boson decaying into four $\ddot{I}„$ leptons via intermediate pseudoscalar $a$ particles, for a Higgs mass range of 70 to 114 $\mathrm{GeV}/c^2$ and an $a$ mass range of 4 to 12 $\mathrm{GeV}/c^2$. No excess above background is seen and a limit is placed on $ξ^2 = \frac{σ(e^+ e^-\ra Z+h)}{σ_{SM}(e^+ e^-\ra Z+h)}\times(h\ra aa)\times(a\ra τ^+τ^-)^2$ in the $m_h,m_a$ plane. For $m_h<107\mathrm{GeV}/c^2$ and $m_a<10\mathrm{GeV}/c^2$, $\hat{I}{¾}^2>1$ can be excluded at the 95\% confidence level.

To appear in the proceedings of the 45th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Valle d'Aosta, Italy, 13-20 Mar 2010. 4 pages, 1 figure