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 $\tau$ 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 ${\xi }^2=\frac{\sigma (e^{+}{e}^{-}\text{ra}Z+h)}{{\sigma }_{SM}(e^{+}{e}^{-}\text{ra}Z+h)}\times (h\text{ra}aa)\times (a\text{ra}{\tau }^{+}{\tau }^{-}{)}^2$ in the $m_h,m_a$ plane. For $m_h<107\mathrm{GeV}/c^2$ and $m_a<10\mathrm{GeV}/c^2$, ${\xi }^2>1$ can be excluded at the 95\% confidence level.

Comments: 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